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Most available prognostic nomograms in metastatic castration-resistant prostate cancer (mCRPC) are derived from datasets not representative of the current treatment landscape. A prognostic nomogram for first-line mCRPC treatment was developed from patients treated in the PREVAIL study. To validate the Armstrong model in the COU-AA-302 trial. A post hoc analysis of mCRPC patients treated in the COU-AA-302 trial was carried out (NCT00887198). The Armstrong prognostic model was applied to patients treated in COU-AA-302. A continuous risk score was derived from coefficients from the original model. Time-dependent area under the curve (tAUC) was used to evaluate the overall predictive ability of the model. Patients were categorized according to the number of risk factors present into those at a low (three or fewer risk factors), intermediate (four to six risk factors), and high (seven to ten risk factors) risk. The association with survival was assessed with Cox regression models. Interaction tests were used to assess the impact of treatment arm in each of the prognostic groups. A total of 1088 patients were analyzed. The risk score was associated with overall survival (OS; tAUC 0.733). Most patients were at a low (49%) or intermediate (41%) risk. Risk category was significantly associated with OS (hazard ratio [HR]: 2.3; 95% confidence interval [CI]: 1.9-2.4; p

BACKGROUND Among men with metastatic prostate cancer, about 10% have germline alterations in DNA damage response genes. Most studies have examined BRCA2 alone or an aggregate of BRCA1/2 and ATM. Emerging data suggest that ATM mutations may have distinct biology and warrant individual evaluation. The objective of this study is to determine whether response to prostate cancer systemic therapies differs between men with germline mutations in ATM (gATM) and BRCA2 (gBRCA2). METHODS This is an international multicenter retrospective matched cohort study of men with prostate cancer harboring gATM or gBRCA2. PSA50 response (≥50% decline in prostate-specific antigen) was compared using Fisher's exact test. RESULTS AND LIMITATIONS The study included 45 gATM and 45 gBRCA2 patients, matched on stage and year of germline testing. Patients with gATM and gBRCA2 had similar age, Gleason grade, and PSA at diagnosis. We did not observe differences in PSA50 responses to abiraterone, enzalutamide, or docetaxel in metastatic castration resistant prostate cancer between the two groups; however, 0/7 with gATM and 12/14 with gBRCA2 achieved PSA50 response to PARPi (p

Background: Plasma AR status has been identified as a potential biomarker of response in metastatic castration-resistant prostate cancer (mCRPC) patients receiving docetaxel or AR-targeted therapies. However, the relevance of plasma AR in the overall management of CRPC patients receiving different docetaxel doses is unknown. Patients and methods: This was a multi-institution study of associations between baseline plasma AR copy number status, assessed by droplet digital PCR, and outcome in 325 mCRPC patients receiving docetaxel at standard or adapted regimen at the discretion of the treating physician. Upon analysis, patients were assigned randomly to either a training (n = 217) or validation (n = 108) cohort. Results: In the training cohort, AR-gained patients treated with adapted docetaxel regimen had a significantly worse median progression-free survival (PFS) (3.8 vs 6.3 months, hazard ratio [HR] 2.58, 95% confidence interval [CI] 1.34–4.95, p < 0.0001), median overall survival (10.8 vs 20.6 months, HR 1.98, 95% CI 1.09–3.62, p = 0.0064) and PSA response (PSA > −50%: odds ratio 4.88 95%CI 1.55–14.32, p = 0.013) as compared to plasma AR normal patients. These findings were all confirmed in the validation cohort. However, in patients treated with standard docetaxel regimen, these differences were not seen. The interaction between AR CN status and dose reduction of docetaxel was considered as independent factor for PFS in both the training and validation cohort (HR 2.84, 95% CI 1.41–5.73, p = 0.003, and HR 4.79, 95% CI 1.79–12.82, p = 0.002). Conclusion: Despite the retrospective non-randomised design of this study, our hypothesis-generating findings could suggest plasma AR as a potential biomarker for optimal docetaxel timing and dose in mCRPC patients. Prospective trials are warranted.

Over the past years, several studies have demonstrated that defects in DNA damage response and repair (DDR) genes are present in a significant proportion of patients with prostate cancer. These alterations, particularly mutations in BRCA2, are known to be associated with an increased risk of developing prostate cancer and more aggressive forms of the disease. There is growing evidence that certain DDR gene aberrations confer sensitivity to poly-(ADP ribose) polymerase inhibitors and/or platinum chemotherapy, while other defects might identify cases that are more likely to benefit from immune checkpoint inhibition. The potential prognostic impact and relevance for treatment selection together with the decreasing costs and broader accessibility to next-generation sequencing have already resulted in the increased frequency of genetic profiling of prostate tumours. Remarkably, almost half of all DDR genetic defects can occur in the germline, and prostate cancer patients identified as mutation carriers, as well as their families, will require appropriate genetic counselling. In this review, we summarise the current knowledge regarding the biology and clinical implications of DDR defects in prostate cancer, and outline how this evidence is prompting a change in the treatment landscape of the disease.

IntroductionLess than one-third of bladder cancers are non-pure urothelial carcinoma [with variant histological (VH) or non-urothelial carcinoma (non-UC)] for which no treatment guidelines are available. We aim to evaluate the efficacy of systemic treatments in VH or non-UC bladder cancers.MaterialsMulticenter retrospective analysis of patients treated for advanced or metastatic VH or non-UC bladder cancers. Primary endpoint was overall response rate (ORR) according to treatment line, regimen and histology subtype. Secondary endpoints were progression-free survival (PFS) and overall survival (OS).ResultsBetween 2005 and 2020, 46 patients from seven centers were included. The median age was 66 years (58.75; 74.75), 65.2% were male and 67.2% presented VH. At first line, the ORR for the entire population was 54.4% and median OS was 21.6 months (95% confidence interval [CI]: 14.2-38.6). The ORR of the 37 patients treated with chemotherapy at first line was 62.2% with median PFS and OS of 7.3 (95% CI: 4.5-8.6) and 21.6 months (95% CI: 14.2-35.7), respectively. Dose dense MVAC and platinum doublet chemotherapy had the highest ORR (71.4% and 65.2%). The 9 patients treated with immunotherapy at first line had an ORR of 22.2%, a median PFS of 3.3 months (95% CI:2.3-NR) and the median OS was not reached (95% CI:13.8-NR). Response to treatment varied depending on the histological sub-types and on the treatment type.ConclusionChemotherapy and immunotherapy have shown to be effective in VH or non-UC cancers, a rare histological subtype for which we currently have very little data in the literature.

Circulating tumor cell (CTC) enumeration and changes following treatment have been demonstrated to be superior to PSA response in determining mCRPC outcome in patients receiving AR signaling inhibitors but not taxanes. We carried out a pooled analysis of two prospective studies in mCRPC patients treated with docetaxel. CTCs were measured at baseline and 3–6 weeks post treatment initiation. Cox regression models were constructed to compare 6-month radiographical progression-free survival (rPFS), CTCs and PSA changes predicting outcome. Among the subjects, 80 and 52 patients had evaluable baseline and post-treatment CTC counts, respectively. A significant association of higher baseline CTC count with worse overall survival (OS), PFS and time to PSA progression (TTPP) was observed. While CTC response at 3–6 weeks (CTC conversion (from ≥5 to &lt, 5 CTCs), CTC30 (≥30% decline in CTC) or CTC0 (decline to 0 CTC)) and 6-month rPFS were significantly associated with OS (all p &lt, 0.005), the association was not significant for PSA30 or PSA50 response. CTC and PSA response were discordant in over 50% of cases, with outcome driven by CTC response in these patients. The c-index values for OS were superior for early CTC changes compared to PSA response endpoints, and similar to 6-month rPFS. Early CTC declines were good predictors of improved outcomes in mCRPC patients treated with docetaxel in this small study, offering a superior and/or earlier estimation of docetaxel benefit in comparison to PSA or rPFS that merits further confirmation in larger studies.

Background: Intraductal (IDC) and cribriform (CRIB) histologies in prostate cancer have been associated with germline BRCA2 (gBRCA2) mutations in small retrospective series, leading to the recommendation of genetic testing for patients with IDC in the primary tumour. Patients and methods: To examine the association of gBRCA2 mutations and other tumour molecular features with IDC and/or cribriform (CRIB) histologies, we conducted a case -control study in which primary prostate tumours from 58 gBRCA2 carriers were matched (1:2) by Gleason Grade Group and specimen type to 116 non-carriers. Presence/absence of IDC and CRIB morphologies was established by two expert uropathologists blinded to gBRCA2 status. Fluorescent in-situ hybridization (FISH) and next-generation sequencing (NGS) were used to detect BRCA2 alterations, PTEN deletions and TMPRSS2-ERG fusions. Chi-squared tests were used to compare the frequency of IDC and CRIB in gBRCA2 carriers and controls and to assess associations with other variables. Logistic regression models were constructed to identify independent factors associated with both histology patterns. Results: No significant differences between gBRCA2 carriers and non-carriers were observed in the prevalence of IDC (36% gBRCA2 versus 50% non-carriers, p = 0.085) or CRIB (53% gBRCA2 versus 43% non-carriers p = 0.197) patterns. However, IDC histology was independently associated with bi-allelic BRCA2 alterations (OR 4.3, 95%CI 1.1-16.2) and PTEN homozygous loss ( OR 5.2, 95% CI 2.1-13.1). CRIB morphology was also independently associated with bi-allelic BRCA2 alterations (OR 5.6, 95%CI 1.7-19.3). Conclusions: While we found no association between gBRCA2 mutations and IDC or CRIB histologies, bi- allelic BRCA2 loss in primary prostate tumours was significantly associated with both variant morphologies, independently of other clinical-pathologic factors. (C) 2021 Elsevier Ltd. All rights reserved.

espanolActualmente las opciones de tratamiento disponibles para el cancer de prostata resistente a la castracion metastasico (CPRCm) son diversas, pero carecemos de datos prospectivos sobre la mejor estrategia de secuenciacion en estos pacientes. El dicloruro de 223Ra es el primer radiofarmaco emisor de particulas alfa que ha demostrado aumento de supervivencia en pacientes con CPRCm. Este farmaco actua selectivamente sobre el hueso, por lo que existe una ventana de oportunidad para su administracion previa al desarrollo de metastasis viscerales, que debe ser tenida en cuenta a la hora de disenar la estrategia terapeutica de estos pacientes. Es necesario, por tanto, definir los diferentes escenarios disponibles en la practica clinica con el fin de llevar a cabo una mejor seleccion de pacientes y su correcta monitorizacion. EnglishCurrently, there are several options available for the treatment of metastatic castration resistant prostate cancer (mCRPC), however evidence on the optimal treatment sequence is lacking. 223Ra is the first targeted alpha therapy that has shown an improvement in overall survival in mCRPC patients. This drug specifically targets bone lesions, so there is a window of opportunity for the administration of 223Ra previous to the development of visceral metastases. This should be taken into account to design the therapeutic strategy for mCRPC patients. It is necessary, therefore, to review the different approaches in routine clinical practice, to define best practices for patient selection and on-treatment monitoring.

There is clinically relevant molecular heterogeneity in prostate cancer (PCa), but this biological diversity has had only a minimal impact on clinical practice. Treatment outcomes in patients with localised PCa are often highly variable, even among patients stratified to the same risk group or disease state based on standard clinical and pathological parameters. In recent years, the development of gene panels has provided valuable data on the differential expression of genes in patients with PCa. Nevertheless, there is an urgent need to identify and validate prognostic and predictive biomarkers that can be applied across clinical scenarios, ranging from localised disease to metastatic castration-resistant PCa. The availability of such tools would allow for precision medicine to finally reach PCa patients. In this review, we evaluate current data on molecular biomarkers for PCa, with an emphasis on the biomarkers and gene panels with the most robust evidence to support their application in routine clinical practice. Sin financiación 6.639 JCR (2020) Q1, 51/242 Oncology 1.818 SJR (2020) Q1, 63/354 Oncology No data IDR 2020 UEM

Early identification of germline BRCA1/2 mutations may be relevant for the management of patients with prostate cancer (PC) and to prevent future breast and ovarian cancers in their relatives. Several prediction tools have been developed to estimate the likelihood of a germline BRCA1/2 mutation and are widely used to optimize screening in breast and ovarian cancer patients. We aimed to elucidate the proportion of PC patients with known BRCA1/2 mutations who would have qualified for testing using two risk calculation models (BRCAPRO and the Manchester scoring system [MSS]). We analyzed 106 families with known BRCA1/BRCA2 mutations, including 23 with PC cases. Only 30% and 48% of PC patients who were known BRCA1/BRCA2 mutations carriers would have qualified for testing using BRCAPRO and MSS, respectively. A median of two breast and/or ovarian cancer cases per family had occurred between the first PC identified in a carrier and the cancer case leading to germline testing. Patient summary We tested two models developed to predict the probability of inherited BRCA1/BRCA2 mutations and found that these tools underperform in men with prostate cancer and should not be used to optimize testing in this population.

5024 Background: PSA value is widely used for the monitoring of treatment outcome in mCRPC in the clinical real-world setting. Early PSA changes are not considered in the definition of PSAProg due to the potential for spurious “flare” reactions. We aimed to evaluate the significance of an early PSA increase in mCRPC patients (pts) treated with enzalutamide or abiraterone (Enz/Abi). Methods: We retrospectively evaluated Enz/Abi-treated mCRPC pts from 11 hospitals between 2011-2020. Early PSAProg was defined as a 25% increase in PSA from baseline at 4 (PSAProg4) or 8 (PSAProg8) weeks after treatment initiation. PSA progression at 12 weeks (PSAProg12) was confirmed by a second reading. Uni- and multivariable (MV) Cox regression models were conducted to explore the association of PSAProg and overall survival (OS) in chemotherapy naïve patients treated with Abi or Enz. Interaction tests were conducted to explore differences in the impact of PSA progression on OS in Abi or Enz-treated pts. Results: We analyzed 511 chemotherapy-naïve mCRPC pts treated with Abi (N=391; 76.5%) or Enz (N=120; 23.5%). Median follow-up: 30.2 months. OS was longer in Enz-treated pts (38.1 vs 29m; HR 1.4; p=0.027). 59 (15.1%), 70 (17.9%) and 48 (12.3%) of Abi-treated and 9 (7.5%), 11 (9.2%) and 10 (8.3%) of Enz-treated pts experienced PSAProg4, PSAProg8 and PSAProg12, respectively, although differences were not statistically significant. PSAProg was associated with worse OS at all 3 timepoints only in Abi-treated pts. In Enz-treated pts, PSAProg4 had a large impact on OS, not observed in PSAProg8 or PSAProg12. We observed no significant interaction between agent (Enz/Abi) and PSA progression (Table). Conclusions: PSA progression at 4 weeks after Enz/Abi is significantly associated with shorter OS and may help identify pts not benefitting from Abi/Enz before clinical or radiographic progression. PSA pattern progression and its association with OS might differ depending on the drug used (Enz/Abi). Prospective validation studies are needed.[Table: see text]

[Purpose] Germline mutations in DNA damage repair (DDR) genes are identified in a significant proportion of patients with metastatic prostate cancer, but the clinical implications of these genes remain unclear. This prospective multicenter cohort study evaluated the prevalence and effect of germline DDR (gDDR) mutations on metastatic castration-resistance prostate cancer (mCRPC) outcomes., [Patients and Methods] Unselected patients were enrolled at diagnosis of mCRPC and were screened for gDDR mutations in 107 genes. The primary aim was to assess the impact of ATM/BRCA1/BRCA2/PALB2 germline mutations on cause-specific survival (CSS) from diagnosis of mCRPC. Secondary aims included the association of gDDR subgroups with response outcomes for mCRPC treatments. Combined progression-free survival from the first systemic therapy (PFS) until progression on the second systemic therapy (PFS2) was also explored., [Results] We identified 68 carriers (16.2%) of 419 eligible patients, including 14 with BRCA2, eight with ATM, four with BRCA1, and none with PALB2 mutations. The study did not reach its primary end point, because the difference in CSS between ATM/BRCA1/BRCA2/PALB2 carriers and noncarriers was not statistically significant (23.3 v 33.2 months; P = .264). CSS was halved in germline BRCA2 (gBRCA2) carriers (17.4 v 33.2 months; P = .027), and gBRCA2 mutations were identified as an independent prognostic factor for CCS (hazard ratio [HR], 2.11; P = .033). Significant interactions between gBRCA2 status and treatment type (androgen signaling inhibitor v taxane therapy) were observed (CSS adjusted P = .014; PFS2 adjusted P = .005). CSS (24.0 v 17.0 months) and PFS2 (18.9 v 8.6 months) were greater in gBRCA2 carriers treated in first line with abiraterone or enzalutamide compared with taxanes. Clinical outcomes did not differ by treatment type in noncarriers., [Conclusion] gBRCA2 mutations have a deleterious impact on mCRPC outcomes that may be affected by the first line of treatment used. Determination of gBRCA2 status may be of assistance for the selection of the initial treatment in mCRPC. Nonetheless, confirmatory studies are required before these results can support a change in clinical practice., Supported by an unrestricted grant from Fundación Cris contra el cancer; three investigator awards from the Prostate Cancer Foundation (C.C.P. [2013], D.O. [2014], and E.C. [2017]); and three grants from Fondo de Investigación Sanitaria, Instituto de Salud Carlos III (No. PI13/01287 and PI16/01565 to D.O. and No. PI15/01471 to P.L.). During the conduct of this study, E.C., D.O., P.N., and L.M.-P. were supported by grants from Ministerio de Economía, Industria y Competitividad (No. JCI-2014-19129 [E.C.], No. RYC-2015-18625 [D.O.], No. SVP-2013-067937 [P.N.], No. SVP-2014-068895 [L.M.]); D.O. was also funded by a Return fellowship from Fundación Científica de la Asociación Española Contra el Cancer, 2012-2015; N.R.L. and R.L., by grants from Instituto de Salud Carlos III (No. CM14-00200 to N.R.L. and No. CM17-00221 [R.L.]); and Y.C., by a grant from Ministerio de Educación, Cultura y Deportes (No. FPU15/05126). C.C.P. was supported by a congressional-designated medical research program award (No. CMRP-PC131820).

5525 Background: The common HSD3B1 (1245A > C) germline variant is associated with increased de-novo synthesis of androgens and worse outcomes in men treated with androgen-deprivation therapy in metastatic hormone sensitive prostate cancer. The aim of this study is to determine the role of this polymorphism on treatment outcomes for AA and ENZA in patients with mCRPC. Methods: A total of 547 patients treated with AA or ENZA for mCRPC from two prospective cohorts; cohort 1 included 202 from British Columbia (Canada) and cohort 2 enrolled 345 patients from the Spanish study PROREPAIR-B. HSD3B1 genotype was determined by targeted sequencing in cohort 1 and by Taqman SNP genotyping assay in cohort 2. Associations between HSD3B1 genotypes and (TTPP), time to progression (TTP) and overall survival (OS) were evaluated via univariate COX regression. Multivariate analysis was performed to determine the independent association of each covariate. Results: The proportions of patients with a homozygous wild-type HSD3B1 (AA), heterozygous (AC) and homozygous variant (CC) genotype were respectively 45.6%, 39.4% and 15%. As expected, known prognostic factors for mCRPC such as hemoglobin, alkaline phosphatase (ALP), LDH, PSA at baseline as well as site of metastasis were significantly associated with TTPP and TPP. In the combined cohort, HSD3B1 (CC) genotype was associated with worse TTP (HR 1.31, 95%CI 1.02-1.67, p = 0.032) and PSA response rates (48% for CC vs 62% and 65% for AA and AC, respectively (p = 0.019, χ²)). Similar trend was observed for TTPP (HR 1.28, 95%CI 0.99-1.66, p = 0.064). OS was not different among genotypes, but was significantly shorter for patients with CC genotype in cohort 1 (HR 1.97, 95%CI 1.14-3.40, p = 0.016). There was no association between HSD3B1 genotype and time to castration-resistance in either of the two cohorts. Multivariable analysis showed that LDH, ALP, hemoglobin and use of AA or ENZA as first-line therapy for mCRPC were independent prognostic factors for TTP and TTPP; non-significant association was observed for genotype and TTP. Conclusions: HSD3B1 homozygous variant genotype (CC) was associated with shorter TTP and lower PSA response rate in mCRPC patients treated with AA or ENZA. However, the CC genotype did not provide prognostic information beyond that conferred by standard clinical variables, suggesting that it may not be a suitable stand-alone biomarker in mCRPC.

5546 Background: Plasma AR status has been identified as a potential biomarker of response in CRPC patients receiving docetaxel or the AR-targeted therapies abiraterone or enzalutamide. However, the relevance of plasma AR in the overall management of CRPC patients (pts) receiving docetaxel at different dose due to the toxicity profiles and physician-patient preferences is unknown. Methods: This was a multi-institution study of associations between baseline plasma AR-copy-number status assessed by droplet digital PCR and outcome in 325 CRPC pts. Between September 2011 and July 2019 pts started treatment with docetaxel administered at standard regimen 75mg/m2 every three weeks or adapted regimen (75-80% of standard recommended dose or 30mg/m2 weekly administration) at the discretion of the treating physician. Patients were assigned randomly into 2 sets with a ratio 2:1 to either training (n=217) and internal validation (n=108) cohorts. Results: In our study, adapted regimen of docetaxel was administered in 68 (31.3%) and 35 (32.4%) of training and validation cohorts, respectively. Based on plasma AR status, 67 (30.9%) and 39 (36.1%) validation and training set pts were classified as AR gain, respectively. In men treated with standard docetaxel regimen, no difference in progression-free/overall survival (PFS/OS) was seen between plasma AR normal and gain in both cohorts. In patients treated with adapted docetaxel regimen, we observed a significantly shorter median PFS (3.9 vs. 6.4 months, HR 4.77, 95%CI 1.48-3.80, p=0.0003) and median OS (11.2 vs . 20.4 months, HR 2.87, 95%CI 1.73-2.13, p=0.0008) in the training cohort. This finding was confirmed in the validation cohort (median PFS: 4.8 vs. 7.4 months, HR 2.54, 95%CI 1.40-4.58, p=0.005, and median OS: 11.8 vs. 26.4 months, HR 5.00, 95%CI 2.59-9.65, p

5554 Background: The CARD trial proved that in mCPRC patients (pts), previously treated with docetaxel and an androgen-receptor signaling inhibitor (ARSi), cabazitaxel (CBZ) significantly improves progression-free (PFS) and Overall Survival (OS) compared with the alternative ARSi. Concurrently, the PROFOUND study showed the superiority of olaparib vs. ARSi in pts with similar prior treatment history and genetic alterations in Homologus Recombination DNA repair related genes (HRR). Methods: PROREPAIR-B (NCT03075735) is a prospective study which aimed to demonstrate the prognostic role of germline deleterious mutations in (g)HRR genes and the benefit of first (1L), second (2L) and subsequent therapy lines for mCRPC. Outcomes with 1-2L have been previously reported. Here we evaluated radiographic (r)-PFS, clinical (c)-PFS, and OS in PROREPAIR-B pts who meet CARD study eligibility criteria and who received CBZ and/or ARSi. Survival analysis were performed using Kaplan Meier method and Cox regression models. Results: 95 out of 419 mCRPC pts included in PROREPAIR-B meet CARD eligibility criteria and received CBZ (n=60) or ARSi (n=35) including 14 gHRR carriers, 8/6 treated with CBZ/ARSi, respectively. Visceral metastases were more frequent among pts treated with CBZ (p=0.01). ECOG 2, M1 at diagnosis, Abiraterone as 1st ARSi and prior radiographic PD (all p

5511 Background: Germline BRCA1/2 (g BRCA1/2) mutations are associated with poor clinical outcomes in PC. Previous studies showed that g BRCA2 carriers present more CNV in several genes associated with more aggressive disease. These aberrations may explain the poor clinical outcomes of these patients, but larger studies are needed to confirm these findings. Methods: PROREPAIR-A is a multicenter case-control study in which g BRCA2 carriers with available diagnostic timor-tissue were matched 1:2 by Gleason and stage at diagnosis (M0 vs M1) with known non-carriers (NC). A minimum of 120 controls-60 cases were required to prove a 5yr Cause Specific Survival (CSS)-rate of 85% vs 60%. The primary endpoint was to confirm the independent prognostic value of g BRCA2 in PC CSS. In addition, we explored the prognostic role of g BRCA1 and somatic events in BRCA2, RB1, MYC, PTEN and TMPRSS2-ERG by FISH. Χ2, Kaplan-Meier, log-rank and cox-regression models were carried out to identify associations with baseline characteristics and outcomes: Metastases Free Survival (MFS), Time to Castration-Resistance (TTCR) and CSS. Results: A total of 80:160 matched cases-controls were initially included, but tumor tissue and clinical data were only available in 73 g BRCA2 and 127 NC. 14 g BRCA1 were also included. At diagnosis, g BRCA2 were younger (median 62.6 vs 64.5, p = 0.02) and had cT3-4 disease more often than NC (31.5% vs 9.4%, p < 0.01), but no other significant differences were found. Somatic BRCA2-RB1 codeletion (40.8% vs 11.8%, p < 0.01) and MYC amplification (51.4% vs 22.8%, p < 0.01) were more frequent in g BRCA2 compared to NC, but no significant differences in PTEN and TMPRSS2-ERG were observed. g BRCA2 mutations as well as somatic BRCA2-RB1 codel and MYC amplif were significantly associated with shorter CSS, MFS and TTCR (Table). MVA model confirmed the independent prognostic value of g BRCA2 (HR 1.94, p = 0.03), BRCA2-RB1 codel (HR 3.16, p < 0.01), MYC amplif (HR 2.36, p < 0.01), Gleason ≥8 (p < 0.01) and M1 at diagnosis (p < 0.01) for CSS. Conclusions: PROREPAIR-A confirmed the independent prognostic value of g BRCA2 for CSS. Somatic BRCA2, RB1 and MYC aberrations were more frequent in g BRCA2 carriers. Those alterations are associated with shorter CSS, MFS and TTCR, and may contribute to poor clinical outcomes in g BRCA2 and NC. [Table: see text]

5579 Background: IDC histology in PC has been suggested to associate with germline BRCA2 mutations (gBRCA2) in small series, leading to the potential recommendation of genetic testing for all PC patients with IDC in the primary tumor. Methods: We conducted a case-control study in which primary PC from 58 germline BRCA2 mutation carriers ( gBRCA2) and 116 from non-carriers (NC) were matched 1:2 by Gleason score and specimen type (core biopsy/prostatectomy). Samples were independently reviewed by two expert pathologists blinded to genetic status who established the presence of IDC and/or CRIB morphology with supportive immunohistochemical stains in a subset of cases. Next-generation sequencing, aCGH and/or FISH were used to assess for somatic mono-/bi-allelic BRCA2 alterations. PTEN protein loss was determined by IHC, and TMPRSS2-ERG was detected by FISH/qRT-PCR. Chi-square tests were used to compare the frequency of IDC and cribriform histology in gBRCA2 vs NC, as well as to assess the associations with other variables. Logistic regression models were built to identify independent factors associated with IDC and CRIB histology. Results: gBRCA2 cases were younger at diagnosis (median 61.3 vs 64, p < 0.01) and had T3-4 disease more often than NC cases (31% vs 10.5%, p < 0.01), but the two groups did not differ in any other clinical-pathologic characteristics. After independent histopathological review, 79 cases demonstrated IDC histology and 81 had CRIB histology. No differences in the prevalence of IDC (50% NC vs 36% gBRCA2, p = 0.09) or CRIB (43% NC vs 53% gBRCA2, p = 0.20) patterns were observed. The probability of IDC was higher in PC with bi-allelic BRCA2 alterations (OR 5.1, 95%CI 2.1-12.6), PTEN loss (OR 5.1, 95%CI 1.9-13.5) or both (OR 23.0, 95%CI 4.9-107.2) compared to those without these alterations. Bi-allelic BRCA2 alteration was also associated with higher probability of CRIB histology (OR 7.2, 95%CI 3.1-16.4). TMPRSS2-ERG fusions were not associated with IDC or CRIB histology. MVA confirmed the independent association of bi-allelic BRCA2 alteration (p < 0.01) and PTEN loss (p < 0.01) with IDC histology. Bi-allelic BRCA2 alteration (p < 0.01) and Gleason >8 (p < 0.01) were independent risk factors for CRIB histology. Conclusions: Primary PC with bi-allelic BRCA2 alterations was significantly associated with IDC and CRIB histology, independent of other clinical-pathologic factors (while gBRCA2 status alone was not). PTEN loss in primary PC was also independently associated with IDC, but not CRIB, histology.

Germline and somatic aberrations in DNA damage repair (DDR) genes are more prevalent in prostate cancer than previously recognized, with BRCA2 as the most commonly altered gene. Germline mutations in BRCA2 have been linked to poor prognosis when patients are managed under the protocols currently approved for prostate cancer. The impact of germline mutations in other DDR genes beyond BRCA2 remain unclear. Importantly, a quarter of prostate cancer patients identified as germline mutation carriers lack a family history of cancer. The clinical implications of somatic DDR defects are yet to be elucidated. Poly ADP-ribose polymerase (PARP) inhibitors and platinum-based chemotherapy have proven to be effective in the treatment of other tumor types linked to BRCA1 and BRCA2 alterations and several trials are currently evaluating their efficacy in prostate cancer. Here, we summarize the available evidence regarding the prevalence of somatic and germline DDR defects in prostate cancer; their association with clinical outcomes; the trials assessing the efficacy of new therapies that exploit DDR defects in prostate cancer and briefly discuss some uncertainties about the most appropriate management for these patients. Funding: R.L., A.A., and D.O. were funded by the Instituto de Salud Carlos III (grants CM17/00221 to R.L., PI16/01070 and CP15/00090 to A.A., and PI16/01565 to D.O.). A.A. is supported by grants from the European Association of Urology Research Foundation (EAURF/407003/XH), a Department of Defense Award (W81XWH-18-1-0193), Fundacion BBVA, CERCA Program/Generalitat de Catalunya, and FEDER funds/European Regional Development Fund (ERDF)-A Way to Build Europe. D.O. was funded by grants fromthe Ministerio de Economía y Empresa (RYC-2015-18625). E.C. and J.M. were supported by Young Investigator Awards from the Prostate Cancer Foundation. J.M. and D.O. were supported by an Impact Award from the Department of Defense US (PC170510P2). Sí

63 Background: Over 10% of men with metastatic prostate cancer (PC) have germline DNA damage response gene alterations; most studies have reported BRCA2 alone or an aggregate of BRCA1, BRCA2 and ATM. Emerging data suggest ATM mutations have distinct effects and warrant individual gene evaluation. We hypothesize that, compared to patients (pts) carrying germline BRCA2 mutations (g BRCA2mut), pts carrying germline ATM mutations (g ATMmut) may have different treatment response to androgen-receptor-targeted agents, docetaxel, platinum therapy and PARP inhibitors (PARPi). Methods: This is an international, multicenter, retrospective case-control study of pts with PC who underwent clinical germline genetic testing between 2014-2019. We identified pts with g ATMmut and matched pts with g BRCA2mut by stage at diagnosis and year of testing. IRB-approved medical records review, χ² and log rank tests were performed. Results: 39 g ATMmut cases and 39 matched g BRCA2mut cases were identified for total of 78. A third (13/39) of pts in each cohort had metastases at diagnosis. Of those diagnosed with localized stage, 81% (21/26) of gATMmut and 73% (19/26) of g BRCA2mut developed metastasis (median times to metastasis 69 vs 49 months, respectively (p=0.1)). Pts in g ATMmut and g BRCA2mut cohorts had similar age, Gleason grade, and PSA at diagnosis. We did not observe a difference in PSA50 response rates to abiraterone, enzalutamide, docetaxel, or carboplatin for mCRPC (Table). g BRCA2mut pts were more likely to respond to PARPi for mCRPC; where available, somatic loss of heterozygosity (LOH) data will be reported at final presentation. Conclusions: While response to standard therapies appears similar between g ATMmut and g BRCA2mut cohorts, response to PARPi in g ATMmut appears to be attenuated compared to g BRCA2mut. More studies are needed and pts with g ATMmut warrant prioritization for novel treatment strategies.[Table: see text]

545 Background: Prognostic factors for survival in metastatic urothelial carcinoma (mUC) have been reported in patients (pts) treated with chemotherapy (Bellmunt and al, JCO 2010). However, no biomarkers have been clearly identified in the setting of immune-checkpoint inhibitors (ICI). The Lung immune prognostic index (LIPI) was associated with clinical outcomes for ICI in lung cancer (Mezquita et al, Jama Oncol 2018) and other tumor types (Varga et al, TAT 2019). In this multicenter retrospective study, we correlated LIPI with outcomes in pts with mUC treated with ICI. Methods: Pts with mUC enrolled from May 2013 to July 2018 in 7 high volume centers were analysed. LIPI score includes: LDH > upper limit of normal and neutrophil/[leukocytes minus neutrophils] ratio (dNLR) > 3. The following LIPI subgroups were defined: good prognosis (0), intermediate prognosis (1) and poor prognosis (2 factors). Median (m) progression-free survival (PFS) and median overall survival (OS) were calculated using Kaplan-Meier method, log rank test was used for statistical comparison. Cox model was used for multivariate analysis. Results: To date, 152 mUC pts have been enrolled and preliminary analysis have been performed in 135 pts. Median age was 67 years, 111 (82%) pts were male, 106 pts (79%) had ECOG PS 0-1, 31 pts (23%) had liver metastasis. Median follow-up was 21.1 months (mo) (95% CI; 16.3-24.5), mPFS was 3.6 mo (95% CI; 2.6-6.0) and mOS was 13.8 mo (95% CI; 11.5-23.2). LIPI classified the population in good (56%), intermediate (35%) and poor (9%) prognosis group. In multivariate analysis, estimated mPFS in good, intermediate and poor prognosis were 5.8 mo (95% CI; 2.6-6.0), 3.6 mo (95% CI; 3.3-16.2) and 1.2 mo (95% CI;0.1-NR), respectively (p = 0.001). Estimated mOS in good, intermediate and poor prognosis were 17.3 mo (95% CI; 13.0-36.8), 16.9 mo (95% CI; 6.9-NR) and 5.4 mo (95% CI;2.5-NR), respectively (p = 0.19). OS data will be validated on larger cohort. Conclusions: The LIPI score is associated with clinical outcome to ICI and may be a useful tool for identifying patients who may not benefit from ICI. Validation in independent prospective cohort is ongoing.

e16541 Background: PSA is a widely used biomarker for monitoring outcome in mCRPC. Current treatment guidelines do not consider PSA progression before at least 12 weeks of treatment, and recommend treatment continuation in pts experiencing progression by PSA only, without radiographic or clinicall progression. We aimed to evaluate the prognostic value of a PSA progression in mCRPC pts treated with first-line therapy. Methods: We analyzed the value of a PSA progression (PSAProg) at cycle 5 in pts treated in the COU-AA-302 trial. PSAProg was defined as an increase ≥ 25% and ≥ 2 ng/mL from baseline, confirmed by a second reading. Radiographic progression (RadProg) was defined as per PCWG2 criteria for bone scan or RECIST progression. Survival and radiographic progression-free survival (rPFS) from the time of PSAProg was calculated using Kaplan-Meier estimates. Cox-regression models were used to evaluate the impact of PSAProg and treatment arm on survival. Results: 1088 pts were randomized in the COU-AA-302 trial. 908 pts (83.5%) had valid baseline and cycle 5 PSA values. Of these, 222 (24.4%) pts experienced PSAProg, which was confirmed in 195 (21.5%) pts; 45/479 (9.4%) of abiraterone and 150/429 (35%) of placebo-treated pts. A confirmed PSAProg was associated with shorter survival (37.8 vs 26m; HR: 1.8; p < 0.001) and rPFS (13.9 vs 5.6m; HR:2.1; p < 0.001). Median survival from the time of PSAProg was 22.2m (95%CI:18.9-25.4). Abiraterone-treated pts had a significantly longer survival from the time of PSAProg (23.1 vs 17.4m; HR: 0.64; p = 0.018). 111 pts (56,9%) experienced PSAprog without RadProg; in pts with PSAprog only, median time to RadProg was 7.4m (95%CI:7.1-12.9). No differences in rPFS from the time of PSAprog were observed in abiraterone vs placebo-treated pts (HR: 0.99; p = 0.963). Conclusions: 9.4% of abiraterone-treated pts in the COU-AA-302 trial experienced PSAProg at 12 weeks (cycle 5 day 1). PSAProg was associated with significantly worse survival. Abiraterone increased survival from the time of PSAProg, which supports its continued use in pts with PSA progression only at 12 weeks. This study was carried out under YODA Project #2018-3011.

e16530 Background: Changes in PSA are widely used as a biomarker for the monitoring of treatment outcome in Metastatic Castration-Resistant Prostate Cancer (mCRPC) in the clinical real-world setting. Early PSA changes (before 12 weeks) are not considered in the definition of PSA Progression (PSAProg) due to the potential for spurious “flare” reactions. We aimed to evaluate the significance of an early PSA increase in Abiraterone/Enzalutamide (Abi/Enz)-treated mCRPC patients (pts). Methods: We retrospectively evaluated Abi/Enz-treated mCRPC pts from 11 hospitals between 2011-2018. Early PSAProg was defined as a 25% increase in PSA from baseline at 4 (PSAProg4) or 8 (PSAProg8) weeks after treatment initiation. PSA progression at 12 weeks (PSAProg12) was confirmed by a second reading. Uni- and multivariable (MV) Cox regression models were conducted to explore the association of PSAProg and overall (OS) and radiographic progression-free (rPFS) survival. Sensitivity (Se), specificity (Sp) and predictive values (PPV, NPV) for the association of early PSAProg with PSAProg12 were calculated. Results: We analyzed 581 mCRPC pts; median follow-up: 19.1 months. 96 (17.1%); 105 (21.6%) and 85 (16.9%) pts had PSAprog at 4, 8 and 12 wks. PSAProg4 and PSAProg8 were significantly associated with confirmed PSAProg12. 55.3% of pts with PSAProg4 and 66.7% of pts with PSAProg8 had a confirmed PSAProg12. Only 9% of pts with no PSA prog at 4 wks and 4.1% of pts with no PSAProg8 had a confirmed PSAProg12. PSAProg4 had Se: 56.6%, Sp: 90.5%, PPV: 55.2%, NPV: 91% for the detection of PSAProg12. PSAProg8 had Se: 81.9%, Sp: 91.2%, PPV: 66.7%, NPV: 95.9% for the detection of PSAProg12. PSAprog at 4, 8 and 12 wks was significantly associated with OS and rPFS in uni- and MV Cox models (Table). Conclusions: Early PSAProg after Abi/Enz is significantly associated with both confirmed PSA Prog at 12 wks and outcome, and may help identify pts not benefitting from Abi/Enz before clinical or radiographic progression. Prospective validation studies are needed. [Table: see text]

5053 Background: Abiraterone (Abi), enzalutamide (Enza) and docetaxel (Doc) are all valid first-line (1L) mCRPC treatment options. SIOG guidelines (Droz, Eur Urol 2017) recommend that fit elderly pts should receive the same treatment as younger patients. Evidence of the optimal treatment sequence in this patient subpopulation is lacking. Methods: We evaluated the outcome of elderly (≥ 75 years [yrs]) pts treated in the prospective PROREPAIR-B cohort study (NCT03075735). We assessed the impact of 1L treatment option (Doc vs Abi/Enza) on overall survival (OS) and progression-free survival (PFS) to 1L-therapy following PCWG2criteria. Uni- (UV) and multivariable (MV) cox-regression models were used. MV model covariates included local therapy, Gleason Score, stage IV at diagnosis, visceral metastases, ALP (≥ULN), LDH (≥ULN), haemoglobin (Hb; ≤LNL), albumin (≤LNL) and ECOG PS. Results: 419 pts were included in the study. Of these, 137 (32,7%) had age ≥ 75 yrs. 48 (35%) received docetaxel and 88 (64.2%) had Abi/Enza as first-line therapy. Of the 121 pts that progressed on 1L-therapy, 30 (24.8%) did not receive 2L therapy. Choice of 2L-therapy was: Doc in 37 (30,6%), Abi/Enza in 38 (31.4%), Cabazitaxel in 9 (7.4%) and Radium-223 in 7 (5.8%) pts. Pts treated with 1L-Doc had higher rates of visceral metastases (22.9% vs 5.7%; p=0.003), high ALP (68.8% vs 43.2%; p=0.004) and low Hb (12.5% vs 3.4%). PFS to 1L-therapy was longer for Abi/Enza than for Doc treated pts (9.6 vs 8.3m; HR: 0.52; p=0.001). The pattern of disease progression (PSA, radiographic, clinical) was similar in Doce and Abi/Enza treated pts. No difference between pts treated with initial Abi/Enza vs Doc was observed in OS (28.2 vs 24.8m; HR:1.18; p=0.474). No significant OS differences were observed in the MV model. Conclusions: No differences in OS were observed between treatment sequences starting with Doc vs Abi/Enza in pts ≥ 75 yrs. Pts treated with 1L-Doc had worse baseline prognostic features. Age should not be considered as a factor for treatment choice in elderly mCRPC pts based on treatment outcome.

Nasal septum perforation in patients with cancer receiving systemic therapy is rare, and its association with bevacizumab use has described recently in the literature. Here, we report the case of a 34-year-old woman with hormone-sensitive, HER-2/neu negative, metastatic breast cancer who develope a nasal septum perforation during the treatment with paclitaxel and bevacizumab.

264 Background: Abiraterone (Abi), enzalutamide (Enza) and docetaxel (Doc) are all valid first-line (1L) mCRPC treatment options. Evidence suggests a degree of cross-resistance between agents, which may impact the efficacy of subsequent lines of therapy. Evidence on the optimal treatment sequence is lacking. Methods: We evaluated the outcome of patients (pts) treated with 1L Doc, Abi or Enza in the prospective PROREPAIR-B cohort study. We assessed the impact of 1L treatment option (Doc vs Abi/Enza) on overall survival (OS), progression-free survival (PFS) to 1L-therapy (PCWG2) and PFS2 (time from initiation of 1L-therapy to progression on second-line [2L] therapy). Uni- (UV) and multivariable (MV) cox-regression models were used. MV model covariates included age (≥75 years), local therapy, Gleason Score, metastases at diagnosis, visceral metastases, ALP (≥ULN), LDH (≥ULN), haemoglobin (≤LNL), albumin (≤LNL) and ECOG PS. Results: 406 pts received 1L-Doce (N=188) or Abi/Enza (N=218). Pts receiving Doc were younger (p=0.002), had higher rates of visceral metastases (17.6 vs 8.7%; p=0.008), ALP (52.1% vs 40.4%; p=0.018), LDH (48.1% vs 31.2%; p

267 Background: Abiraterone, enzalutamide and docetaxel represent first-line (1L) treatment options in mCRPC. A significant correlation between rPFS and OS has been reported for patients treated with 1L abi and enza in mCRPC. It is however unclear whether TTPP or rPFS present a similar magnitude of correlation with OS in Doc-treated pts. Methods: We evaluated the association of TTPP and rPFS with OS in pts treated with 1L Abi/Enza or Doc in a prospective multicenter observational cohort study. TTPP and rPFS were defined as per PCWG2. Correlation between TTPP and rPFS with OS was evaluated with Spearman rho coefficients (r), and by calculating the concordance index (c-index) in Cox-regression models. Results: 406 out of 419 pts received 1L Abi/Enza or Doc. After a median follow-up of 40 months (m), 253 mCRPC-related deaths were observed, with a median OS of 31.3 m (95% CI: 27.6-35). Median rPFS and TTPP were 10.8 m (95% CI:9.7-11.9) and 7.2 m (95% CI:6.7-7.7), respectively. Significant correlations between rPFS/TTPP and OS were observed in all pts treated at 1L, as well as in Abi/Enza and Doc treated pts (Table). R and c-index were consistently higher in Abi/Enza treated pts than in Doc treated pts, with a higher difference in predictive accuracy of the Cox regression model observed when comparing the association between TTPP and OS (c-index 0.788 in Abi/Enza treated pts vs 0.627 in Doc treated pts). Conclusions: Differences in r and c-index were observed when evaluating the association between TTPP/rPFS and OS in Abi/Enza and Doc treated pts, suggesting rPFS and TTPP may better predict OS in Abi/Enza than in Doc-treated pts. Indirect comparisons of TTPP in Abi/Enza vs Doc pts may therefore not reflect their true impact on OS. Further insight on the exact significance of TTPP is needed. Clinical trial information: NCT03075735. [Table: see text]

5071Background: Germline mutations in BRCA2 have been identified in 3-5% of mCRPC patients. PROREPAIR-B (Castro et al ESMO 2017) is the first prospective study to report a worse survival from mCRPC...

164 Background: Germline mutations in DNA repair genes have been associated with poor prostate cancer outcomes in retrospectives studies. Such defects have been identified in 12% of mCRPC patients. Several studies are ongoing to assess the benefit of these patients from platinum-based chemotherapy and PARP inhibitors, but no conclusive data are available with regards to currently approved therapies for mCRPC, as Abiraterone or Enzalutamide. Methods: PROREPAIR-B (NCT03075735) is a prospective multicentre observational cohort study. Patients diagnosed with mCRPC, with unknown mutational status at study entry and who were going to start a first-line treatment for mCRPC were eligible. For this sub-analysis patients who received Abiraterone or Enzalutamide as first androgen receptor targeted therapy (ART) were selected. The endpoints of this sub-analysis included to assess the impact of BRCA1, BRCA2, ATM, PALB2 and other germline mutations in DNA repair genes on cause-specific survival (CSS), progression-free survival (PFS), time to PSA progression (bPFS) and response to the first ART received as 1st or 2nd line therapy. Results: 337 patients were eligible for this analysis. CSS from mCRPC was not significantly different between gDDR carriers and non-carriers. However, CSS from mCRPC in BRCA2 carriers was significantly shorter than in non-carriers (23.3 Vs 34.6 months, p = 0.02). CSS from first ART, PFS and response-rates were not significantly different between both groups. However, the bPFS was significantly shorter in patients harbouring gDDR mutations (7.3 Vs 3.8 months, p = 0.04), especially in BRCA2 carriers (7.3 Vs 3.0 months, p = 0.03). Conclusions: This is the first study to prospectively follow-up DNA repair germline mutations to determine the outcome on standard treatment for mCRPC. The results suggest that different gDDR defects may have different impact on mCRPC outcomes. Clinical trial information: NCT03075735.

e12062 Background: Prosigna is a standardized test based on the PAM50 gene signature which provides information on intrinsic subtype and risk of recurrence (ROR) score predicting 10y recurrence probability (NanoString Technologies, Inc., Seattle, WA). We evaluated Prosigna’s impact on adjuvant treatment decision beyond immunohistochemistry (IHC) testing. Methods: 125 pre- and postmenopausal EBC patients with ER+, HER2-, pT1-T2 pN0/pN1mi were enrolled (12 centers; 8/2015-11/2016). FFPE specimens were centrally analyzed using Prosigna to classify patients according to the intrinsic tumor subtype and ROR score. The primary endpoint was the impact of the Prosigna test on adjuvant treatment decision. Results: 64% of tumors were classified by PAM50 as Lum A, 35% as Lum B, 0% Basal, 1% HER2-E. The intrinsic subtype concordance between immunohistochemistry (IHC) and Prosigna (n = 119) was 61.3%. In Lum B tumors by IHC the discordance rate was the highest (48% were reclassified as Lum A by Prosigna) as shown in the Table. ROR risk groups were as follows: ROR low (54; 43%), ROR interm. (38; 30%), and ROR high (33; 27%). Prosigna results led to a treatment recommendation change in 49 (39%) patients. In the 76 (61%) cases with the initial recommendation of Hormonal Therapy (HT) alone the final decision changed to chemotherapy (CT)+HT (CHT) in 24 (32%) patients. In the 49 (39%) cases in which the initial recommendation was CHT the final decision changed to HT in 25 (51%) patients. Among the 38 patients with Prosigna intermediate risk, 21 (55%) were allocated to HT. Conclusions: In this prospective decision impact study, Prosigna results led to a 39% change in adjuvant therapy indication. Patients with initial indication of CHT were changed to HT alone in > 50% of cases. Thus, Prosigna results influenced the treatment decisions and reinforced its clinical utility in real-world settings. The intrinsic subtype classification based on IHC didn’t show to be an adequate surrogate for the genomic subtypes as determined by Prosigna. [Table: see text]

327 Background: Abiraterone acetate (AA) administered with prednisone (P) to reduce mineralocorticoid-related adverse events improves survival in CRPC with a favourable tolerance profile. However, in the phase I/II of AA without steroids, dexamethasone 0,5mg/day was added after biochemical progression reaching a 25% of PSA decline. Lorente et al (BJC, 2014) showed durable biochemical responses in 40% of cases treated with AA and steroid switch in the post-docetaxel setting. We hypothesize that P to D switch in patients with biochemical progression to AA+P would lead to secondary responses also in the pre-docetaxel setting. Methods: Change of P 5mg/12h to D 0.5mg/24h was prospectively tested in clinically stable CRPC with biochemical progression ( > 25% PSA rise over nadir, confirmed in a second determination) and/or limited radiological progression ( < 3 new bone/lymphatic metastasis, non-bulky), after ³12 weeks of AA+P. PSA was monitored q4wks. CT- & bone-scans were performed every 12-16 weeks. Biochemical and radiological responses were evaluated by PSAWG2 and RECIST criteria. Survival outcomes were calculated using Kaplan-Meier method. Results: 18 patients were included (11 pre- & 7 post-docetaxel). Median age 72 (60-85); visceral, bone and/or lymph metastasis were present in 17%, 83% and 50% of patients. Median PSA at AA+P and AA+D commencement was 81 ng/ml and 100ng/ml, respectively. Biochemical response was observed in 83% of patients: 56% with a PSA decrease ≥ 30%, and 28% with PSA decrease ≥ 50%. Median biochemical progression-free survival (bPFS) with AA+P was 5.7 months (CI95% 2.9-9.1) and 3.8m (CI95% 1.4-6.5) in the pre- and post-docetaxel setting, respectively. Median bPFS with AA+D was 5.4m (1.2-8.8) and 2.5 (CI95% 1.1-2.9) in the pre- and post-docetaxel settings. Two radiological partial responses were observed with AA+D. Conclusions: Clinically stable patients with limited disease progression after AA+P may benefit from steroid switch in both the pre- and post-docetaxel settings.

e16077 Background: CTCs are emerging as a source of material for therapy-resistant prostate cancer, a so-called “liquid biopsy” that could serve as a therapeutic biomarker. CTCs can be obtained thr...

e22058 Background: Determining the number of circulating tumor cells (CTCs) in patients with metastatic colorectal cancer (CRC) has shown to be a prognostic factor, recent studies have proven the existence of EpCAM and cytokeratin negative CTCs. These cells present morphological and genetic alterations. Our study is based on an algorithm determined by the selection of the size of the cells and the genetic alterations detected by FISH which enables the isolation of CTCs in CRC patients by an automated system of fluorescence. Methods: Patients with metastatic CRC with normal blood differential and healthy controls between June 2011 and June 2012 were chosen. The objective was to show the differences between the quantification of morphogenetically altered cells in peripheral blood obtained from control and patients. The selected cells were over 7 micra in size and presented two or more genetic alterations. A combination of four probe sets was used: centromeric probe for CEP3, CEP7 and CEP17 and LSI p16INK4A 9p21.3. Fluorescent signals in specimens were quantified using an automated fluorescent system (Metafer) that is capable of scanning and classifying hundreds of cells under fluorescent illumination and allows for detection of cells according to nuclear size > 7 um and FISH pattern based on the algorithm that we have developed. Results: We selected 28 healthy individuals and 45 patients with CRC. In all the cases, 1,000 cells were analyzed in each individual. Only 30 cells >7 micra being found in the controls out of the 28,000 cells analyzed (0.1%). In the case of the patients, 640 cells were found (1.42%), the difference becoming statistically relevant after the T-test (p=0.003). None of the controls presented cells with two or more genetic alterations and over 7 micra in size, whereas 38% of the patients presented these characteristics despite having received treatment. The most frequent chromosomal changes were trisomy 3 and 17 (26% and 18%, respectively). Conclusions: This method allows us to select genetically abnormal circulating cells in a simple and automatic way. This opens the door for future studies to analyze the prognostic factor and the response rate to treatment under this method.

The National Nutrition and Health Survey, implemented in 1986 in Ecuador, investigated nutritional status, food intake, morbidity and mortality of 0–5 year-old children in the country (Freire et al., 1988). High prevalences of malnutrition, as assessed by anthropometry, were found: prevalences of linear growth retardation ranged between 37% in the costal urban areas and 67% in the rural Andes. Single nutrient deficiencies were also widespread: anemia was a particularly serious problem with 69% of the children between 6 and 11 months of age being anemic; vitamin A status was marginal and riboflavin status was poor.