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Epithelial ovarian carcinoma (EOC) is a relatively rare malignancy but is the fifth-leading cause of cancer-related death in women, largely reflecting early, prediagnosis dissemination of malignant disease to the peritoneum. At odds with other neoplasms, EOC is virtually insensitive to immune checkpoint inhibitors, correlating with a tumor microenvironment that exhibits poor infiltration by immune cells and active immunosuppression. Here, we comparatively summarize the humoral and cellular features of primary and metastatic EOC, comparatively analyze their impact on disease outcome, and propose measures to alter them in support of treatment sensitivity and superior patient survival.

Analysis of cell‐free DNA methylation (cfDNAme), alone or combined with CA125, could help to detect ovarian cancers earlier and may reduce mortality. We assessed cfDNAme in regions of ZNF154, C2CD4D and WNT6 via targeted bisulfite sequencing in diagnostic and early detection (preceding diagnosis) settings. Diagnostic samples were obtained via prospective blood collection in cell‐free DNA tubes in a convenience series of patients with a pelvic mass. Early detection samples were matched case‐control samples derived from the UK Familial Ovarian Cancer Screening Study (UKFOCSS). In the diagnostic set (ncases = 27, ncontrols = 41), the specificity of cfDNAme was 97.6% (95% CI: 87.1%‐99.9%). High‐risk cancers were detected with a sensitivity of 80% (56.3%‐94.3%). Combination of cfDNAme and CA125 resulted in a sensitivity of 94.4% (72.7%‐99.9%) for high‐risk cancers. Despite technical issues in the early detection set (ncases = 29, ncontrols = 29), the specificity of cfDNAme was 100% (88.1%‐100.0%). We detected 27.3% (6.0%‐61.0%) of high‐risk cases with relatively lower genomic DNA (gDNA) contamination. The sensitivity rose to 33.3% (7.5%‐70.1%) in samples taken <1 year before diagnosis. We detected ovarian cancer in several patients up to 1 year before diagnosis despite technical limitations associated with archival samples (UKFOCSS). Combined cfDNAme and CA125 assessment may improve ovarian cancer screening in high‐risk populations, but future large‐scale prospective studies will be required to validate current findings. [ABSTRACT FROM AUTHOR]

The vast majority of epithelial ovarian cancer arises from tissues that are embryologically derived from the Müllerian Duct. Here, we demonstrate that a DNA methylation signature in easy-to-access Müllerian Duct-derived cervical cells from women with and without ovarian cancer (i.e. referred to as the Women's risk IDentification for Ovarian Cancer index or WID-OC-index) is capable of identifying women with an ovarian cancer in the absence of tumour DNA with an AUC of 0.76 and women with an endometrial cancer with an AUC of 0.81. This and the observation that the cervical cell WID-OC-index mimics the epigenetic program of those cells at risk of becoming cancerous in BRCA1/2 germline mutation carriers (i.e. mammary epithelium, fallopian tube fimbriae, prostate) further suggest that the epigenetic misprogramming of cervical cells is an indicator for cancer predisposition. This concept has the potential to advance the field of risk-stratified cancer screening and prevention. Most ovarian cancers originate from cells originally derived from Müllerian Duct cells. Here, the authors show that the methylation profile of Müllerian Duct cells isolated from cervical samples can predict whether a woman has cervical cancer. [ABSTRACT FROM AUTHOR]

DCVAC/OvCa is an active cellular immunotherapy designed to stimulate an immune response against ovarian cancer. We explored the safety and efficacy of DCVAC/OvCa plus carboplatin and gemcitabine in platinum-sensitive ovarian cancer. In this open-label, parallel-group, phase 2 trial (ClinicalTrials.gov number NCT02107950), patients with platinum-sensitive ovarian cancer relapsing after first-line chemotherapy were randomized to DCVAC/OvCa and chemotherapy or chemotherapy alone. DCVAC/OvCa was administered every 3–6 weeks (10 doses). Endpoints included safety, progression-free survival (PFS; primary efficacy endpoint) and overall survival (OS; secondary efficacy endpoint). Between November 2013 and May 2015, 71 patients were randomized to chemotherapy in combination with DCVAC/OvCa or to chemotherapy alone. Treatment-emergent adverse events related to DCVAC/OvCa, leukapheresis and chemotherapy occurred in six (16.2%), two (5.4%), and 35 (94.6%) patients in the DCVAC/OvCa group. Chemotherapy-related events occurred in all patients in the chemotherapy group. Seven patients in the DCVAC/OvCa group were excluded from primary efficacy analyses due to failure to receive ≥1 dose of DCVAC/OvCa. PFS was not improved (hazard ratio [HR] 0.73, 95% confidence interval [CI] 0.42–1.28, P = 0.274, data maturity 78.1%). Median OS was significantly prolonged (by 13.4 months) in the DCVAC/OvCa group (HR 0.38, 95% CI 0.20–0.74, P = 0.003; data maturity 56.3%). A signal for enhanced surrogate antigen-specific T-cell activity was seen with DCVAC/OvCa. DCVAC/OvCa combined with chemotherapy had a favorable safety profile in patients with platinum-sensitive ovarian cancer. DCVAC/OvCa did not improve PFS, but the exploratory analyses revealed OS prolongation and enhanced surrogate antigen-specific T-cell activity. • Randomized trial of DCVAC/OvCa, dendritic cell-based immunotherapy in platinum-sensitive ovarian cancer. • The addition of DCVAC/OvCa to second-line chemotherapy had a favorable safety profile. • DCVAC/OvCa did not improve progression-free survival, but did prolong overall survival by 13.4 months. • DVCAC/OvCa plus chemotherapy enhanced surrogate T-cell activity. [ABSTRACT FROM AUTHOR]

The European Society of Gynaecological Oncology (ESGO), the International Society of Ultrasound in Obstetrics and Gynecology (ISUOG), the International Ovarian Tumour Analysis (IOTA) group, and the European Society for Gynaecological Endoscopy (ESGE) jointly developed clinically relevant and evidence-based statements on the pre-operative diagnosis of ovarian tumors, including imaging techniques, biomarkers, and prediction models. ESGO/ISUOG/IOTA/ESGE nominated a multidisciplinary international group, including expert practising clinicians and researchers who have demonstrated leadership and expertise in the pre-operative diagnosis of ovarian tumors and management of patients with ovarian cancer (19 experts across Europe). A patient representative was also included in the group. To ensure that the statements were evidence-based, the current literature was reviewed and critically appraised. Preliminary statements were drafted based on the review of the relevant literature. During a conference call, the whole group discussed each preliminary statement and a first round of voting was carried out. Statements were removed when a consensus among group members was not obtained. The voters had the opportunity to provide comments/suggestions with their votes. The statements were then revised accordingly. Another round of voting was carried out according to the same rules to allow the whole group to evaluate the revised version of the statements. The group achieved consensus on 18 statements. This Consensus Statement presents these ESGO/ISUOG/IOTA/ESGE statements on the pre-operative diagnosis of ovarian tumors and the assessment of carcinomatosis, together with a summary of the evidence supporting each statement. [ABSTRACT FROM AUTHOR]

Objective: The aim of this study was to develop clinically relevant and evidence-based guidelines as part of European Society of Gynaecological Oncology's mission to improve the quality of care for women with gynecological cancers across Europe. Methods: The European Society of Gynaecological Oncology council nominated an international multidisciplinary development group made of practicing clinicians who have demonstrated leadership and interest in the care of ovarian cancer (20 experts across Europe). To ensure that the statements are evidence based, the current literature identified from a systematic search has been reviewed and critically appraised. In the absence of any clear scientific evidence, judgmentwas based on the professional experience and consensus of the development group (expert agreement). The guidelines are thus based on the best available evidence and expert agreement. Before publication, the guidelines were reviewed by 66 international reviewers independent from the development group including patients representatives. Results: The guidelines cover preoperative workup, specialized multidisciplinary decision making, and surgical management of diagnosed epithelial ovarian, fallopian tube, and peritoneal cancers. The guidelines are also illustrated by algorithms. [ABSTRACT FROM AUTHOR]

Supplemental digital contents are available in the text. Objectives: The surgical management of advanced ovarian cancer involves complex surgery. Implementation of a quality management program has a major impact on survival. The goal of this work was to develop a list of quality indicators (QIs) for advanced ovarian cancer surgery that can be used to audit and improve the clinical practice. This task has been carried out under the auspices of the European Society of Gynaecologic Oncology (ESGO). Methods: Quality indicators were based on scientific evidence and/or expert consensus. A 4-step evaluation process included a systematic literature search for the identification of potential QIs and the documentation of scientific evidence, physical meetings of an ad hoc multidisciplinarity International Development Group, an internal validation of the targets and scoring system, and an external review process involving physicians and patients. Results: Ten structural, process, or outcome indicators were selected. Quality indicators 1 to 3 are related to achievement of complete cytoreduction, caseload in the center, training, and experience of the surgeon. Quality indicators 4 to 6 are related to the overall management, including active participation to clinical research, decision-making process within a structured multidisciplinary team, and preoperative workup. Quality indicator 7 addresses the high value of adequate perioperative management. Quality indicators 8 to 10 highlight the need of recording pertinent information relevant to improvement of quality. An ESGO-approved template for the operative report has been designed. Quality indicators were described using a structured format specifying what the indicator is measuring, measurability specifications, and targets. Each QI was associated with a score, and an assessment form was built. Conclusions: The ESGO quality criteria can be used for self-assessment, for institutional or governmental quality assurance programs, and for the certification of centers. Quality indicators and corresponding targets give practitioners and health administrators a quantitative basis for improving care and organizational processes in the surgical management of advanced ovarian cancer. [ABSTRACT FROM AUTHOR]

A recent study on the use of cancer antigen 125 (CA-125) in follow-up of patients with epithelial ovarian cancer after complete response on primary treatment is critically reviewed. As it has been suggested to refrain from CA-125 altogether, this European Society of Gynaecologic Oncology report has also reviewed possible disadvantages, even possible harm, and potentially missed opportunities when such policy would be implemented. It is concluded that indeed routine use of CA-125 does not provide patient benefit in survival or quality of life. However, there may be other reasons for monitoring CA-125, which are discussed in this review. It is noted that the lack of benefit of CA-125 monitoring has only been proven for a specific subset of ovarian cancer patients with serous histology and frequent follow-up visits including imaging and in a clinical environment where, particularly, surgery for recurrent disease and clinical studies on new second-line agents will not be considered. A special warning is issued not to stop tumor marker follow-up in other than epithelial ovarian cancers and in follow-up of patients who not have been treated with chemotherapy. [ABSTRACT FROM AUTHOR]

A recently published meta-analysis of 21 studies confirmed a protective effect of tubal ligation on the risk of invasive ovarian cancer. This protective measure has received little attention, particularly due to the elusive underlying mechanism. In this commentary we discuss available data concerning the contribution of different potential mechanisms by which tubal ligation might prevent ovarian cancer. Included were studies published in English, identified through a literature search using PubMed and EMBASE. Four main mechanisms are discussed: (a) a screening effect, (b) alteration of ovarian function, (c) a mechanical barrier against ascending carcinogenic agents and (d) prevention of endometrial and proximal Fallopian tube cell ascent. There are arguments supporting the major role of a mechanical barrier to the ascent of endometrial cells into the peritoneal cavity for decreasing risk of ovarian cancer after tubal ligation. Prevention of retrograde transport of carcinogenic substances from the vagina may be an additional mechanism. [ABSTRACT FROM AUTHOR]

High-grade serous ovarian cancer (HGSC) is the most common subtype of ovarian cancer, with a poor prognosis; however, most studies concerning ovarian carcinoma have focused mainly on clear cell carcinoma. The involvement of hepatocyte nuclear factor 1β (HNF1B) in the carcinogenesis of HGSC has not yet been fully elucidated. To the best of our knowledge, the present study is the first to analyse the expression of the possible downstream target of HNF1B, enoyl-CoA (Δ) isomerase 2 (ECI2), in HGSC. The present study performed a comprehensive analysis of HNF1B mRNA and protein expression, and epigenetic and genetic changes, as well as an analysis of ECI2 mRNA and protein expression in 122 cases of HGSC. HNF1B protein expression was detected in 28/122 cases, and was positively associated with lymphovascular invasion (P=0.025). Protein expression of ECI2 was detected in 115/122 cases, but no associations with clinicopathological variables were revealed. Therefore, ECI2 does not seem to function as a suitable prognostic marker for HGSC. In the sample set, a positive correlation between HNF1B and ECI2 protein expression was detected (P=0.005). HNF1B mRNA was also positively correlated with HNF1B protein expression (P=0.001). HNF1B promoter methylation was detected in 26/67 (38.8%) of cases. A novel pathogenic somatic HNF1B mutation was detected in 1/61 (1.6%) of the analysed HGSC cases. No other correlations between the examined SNPs (rs4430796, rs757210 and rs7405776), HNF1B promoter methylation, HNF1B/ECI2 expression or clinicopathological characteristics were found. [ABSTRACT FROM AUTHOR]

Background: Few prospective studies have compared poly(adenosine diphosphate-ribose) polymerase (PARP) inhibitors to chemotherapy for the treatment of BRCA1-mutated or BRCA2-mutated ovarian carcinoma. We aimed to assess rucaparib versus platinum-based and non-platinum-based chemotherapy in this setting.Methods: In this open-label, randomised, controlled, phase 3 study (ARIEL4), conducted in 64 hospitals and cancer centres across 12 countries (Brazil, Canada, Czech Republic, Hungary, Israel, Italy, Poland, Russia, Spain, Ukraine, the UK, and the USA), we recruited patients aged 18 years and older with BRCA1-mutated or BRCA2-mutated ovarian carcinoma, with an Eastern Cooperative Oncology Group performance status of 0 or 1, and who had received two or more previous chemotherapy regimens. Eligible patients were randomly assigned (2:1), using an interactive response technology and block randomisation (block size of six) and stratified by progression-free interval after the most recent platinum-containing therapy, to oral rucaparib (600 mg twice daily) or chemotherapy (administered per institutional guidelines). Patients assigned to the chemotherapy group with platinum-resistant or partially platinum-sensitive disease were given paclitaxel (starting dose 60-80 mg/m2 on days 1, 8, and 15); those with fully platinum-sensitive disease received platinum-based chemotherapy (single-agent cisplatin or carboplatin, or platinum-doublet chemotherapy). Patients were treated in 21-day or 28-day cycles. The primary endpoint was investigator-assessed progression-free survival, assessed in the efficacy population (all randomly assigned patients with deleterious BRCA1 or BRCA2 mutations without reversion mutations), and then in the intention-to-treat population (all randomly assigned patients). Safety was assessed in all patients who received at least one dose of assigned study treatment. This study is registered with ClinicalTrials.gov, NCT02855944; enrolment is complete, and the study is ongoing.Findings: Between March 1, 2017, and Sept 24, 2020, 930 patients were screened, of whom 349 eligible patients were randomly assigned to rucaparib (n=233) or chemotherapy (n=116). Median age was 58 years (IQR 52-64) and 332 (95%) patients were White. As of data cutoff (Sept 30, 2020), median follow-up was 25·0 months (IQR 13·8-32·5). In the efficacy population (220 patients in the rucaparib group; 105 in the chemotherapy group), median progression-free survival was 7·4 months (95% CI 7·3-9·1) in the rucaparib group versus 5·7 months (5·5-7·3) in the chemotherapy group (hazard ratio [HR] 0·64 [95% CI 0·49-0·84]; p=0·0010). In the intention-to-treat population (233 in the rucaparib group; 116 in the chemotherapy group), median progression-free survival was 7·4 months (95% CI 6·7-7·9) in the rucaparib group versus 5·7 months (5·5-6·7) in the chemotherapy group (HR 0·67 [95% CI 0·52-0·86]; p=0·0017). Most treatment-emergent adverse events were grade 1 or 2. The most common grade 3 or worse treatment-emergent adverse event was anaemia or decreased haemoglobin (in 52 [22%] of 232 patients in the rucaparib group vs six [5%] of 113 in the chemotherapy group). Serious treatment-emergent adverse events occurred in 62 (27%) patients in the rucaparib group versus 13 (12%) in the chemotherapy group; serious adverse events considered related to treatment by the investigator occurred in 32 (14%) patients in the rucaparib group and six (5%) in the chemotherapy group. Three deaths were considered to be potentially related to rucaparib (one due to cardiac disorder, one due to myelodysplastic syndrome, and one with an unconfirmed cause).Interpretation: Results from the ARIEL4 study support rucaparib as an alternative treatment option to chemotherapy for patients with relapsed, BRCA1-mutated or BRCA2-mutated ovarian carcinoma.Funding: Clovis Oncology. [ABSTRACT FROM AUTHOR]

Background: Various factors-including age, family history, inflammation, reproductive factors, and tubal ligation-modulate the risk of ovarian cancer. In this study, our aim was to establish whether women with, or at risk of developing, ovarian cancer have an imbalanced cervicovaginal microbiome.Methods: We did a case-control study in two sets of women aged 18-87 years in the Czech Republic, Germany, Italy, Norway, and the UK. The ovarian cancer set comprised women with epithelial ovarian cancer and controls (both healthy controls and those diagnosed with benign gynaecological conditions). The BRCA set comprised women with a BRCA1 mutation but without ovarian cancer and controls who were wild type for BRCA1 and BRCA2 (both healthy controls and those with benign gynaecological conditions). Cervicovaginal samples were gathered from all participants with the ThinPrep system and then underwent 16S rRNA gene sequencing. For each sample, we calculated the proportion of lactobacilli species (ie, Lactobacillus crispatus, Lactobacillus iners, Lactobacillus gasseri, and Lactobacillus jensenii), which are essential for the generation of a protective low vaginal pH, in the cervicovaginal microbiota. We grouped samples into those in which lactobacilli accounted for at least 50% of the species present (community type L) and those in which lactobacilli accounted for less than 50% of the species present (community type O). We assessed the adjusted association between BRCA1 status and ovarian cancer status and cervicovaginal microbiota community type, using a logistic regression model with a bias reduction method.Findings: Participants were recruited between Jan 2, 2016, and July 21, 2018. The ovarian cancer set (n=360) comprised 176 women with epithelial ovarian cancer, 115 healthy controls and 69 controls with benign gynaecological conditions. The BRCA set (n=220) included 109 women with BRCA1 mutations, 97 healthy controls wild type for BRCA1 and BRCA2 and 14 controls with a benign gynaecological condition wild type for BRCA1 and BRCA2. On the basis of two-dimensional density plots, receiver-operating characteristic curve analysis, and age thresholds used previously, we divided the cohort into those younger than 50 years and those aged 50 years or older. In the ovarian cancer set, women aged 50 years or older had a higher prevalence of community type O microbiota (81 [61%] of 133 ovarian cancer cases and 84 [59%] of 142 healthy controls) than those younger than 50 years (23 [53%] of 43 cases and 12 [29%] of 42 controls). In the ovarian cancer set, women younger than 50 years with ovarian cancer had a significantly higher prevalence of community type O microbiota than did age-matched controls under a logistic regression model with bias correction (odds ratio [OR] 2·80 [95% CI 1·17-6·94]; p=0·020). In the BRCA set, women with BRCA1 mutations younger than 50 years were also more likely to have community type O microbiota than age-matched controls (OR 2·79 [95% CI 1·25-6·68]; p=0·012), after adjustment for pregnancy (ever). This risk was increased further if more than one first-degree family member was affected by any cancer (OR 5·26 [95% CI 1·83-15·30]; p=0·0022). In both sets, we noted that the younger the participants, the stronger the association between community type O microbiota and ovarian cancer or BRCA1 mutation status (eg, OR for community type O for cases aged <40 years in the ovarian cancer set 7·00 [95% CI 1·27-51·44], p=0·025; OR for community type O for BRCA1 mutation carriers aged <35 years in the BRCA set 4·40 [1·14-24·36], p=0·031).Interpretation: The presence of ovarian cancer, or factors known to affect risk for the disease (ie, age and BRCA1 germline mutations), were significantly associated with having a community type O cervicovaginal microbiota. Whether re-instatement of a community type L microbiome by using, for example, vaginal suppositories containing live lactobacilli, would alter the microbiomial composition higher up in the female genital tract and in the fallopian tubes (the site of origin of high-grade serous ovarian cancer), and whether such changes could translate into a reduced incidence of ovarian cancer, needs to be investigated.Funding: EU Horizon 2020 Research and Innovation Programme, EU Horizon 2020 European Research Council Programme, and The Eve Appeal. [ABSTRACT FROM AUTHOR]

We analyzed the accuracy of transvaginal sonography in detection of pelvic carcinomatosis in ovarian cancer patients and factors (age, body mass index, performance status, ascites, stage, histotype, tumor grade) influencing the performance of ultrasound. In this prospective study, all 191 consecutively included patients underwent a pre-operative ultrasound staging examination according to institutional protocol. Peritoneal spread was assessed on the basis of peri-operative findings or histology. The area under the receiver operating characteristic curve for the detection of carcinomatosis was 0.90 (0.84-0.93); the sensitivity was 84% (95% confidence interval [CI]: 75%-%90), specificity 96% (95% CI: 89%-99%), positive predictive value 96% (95% CI: 89%-99%), negative predictive value 83% (95% CI: 74%-90%) and overall accuracy 89% (95% CI: 84%-93%). We report that transvaginal sonography is clinically useful in the detection of pelvic carcinomatosis. [ABSTRACT FROM AUTHOR]

Although primary results from the IMagyn050 trial showed no statistically significant improvement in progression-free survival (PFS) with atezo added to carboplatin/paclitaxel/bevacizumab (CPB) [Moore, ESMO 2020], the impact of this regimen on selected patient (pt)-reported ovarian cancer symptoms, function, and health-related quality of life (HRQoL) is unknown and the focus of this study. IMagyn050 is a double-blind randomized phase 3 trial evaluating the efficacy and safety of adding atezo/placebo to CPB followed by maintenance bevacizumab + atezo/placebo. The trial includes two cohorts: neoadjuvant chemotherapy (NACT) and primary surgery (PS). Pts complete EORTC QLQ-C30, QLQ-OV28, and FACT-G single-item GP5 at baseline (BL) and at regular intervals during treatment and follow-up. In NACT pts, prespecified responder analyses (using a ≥10-point cutoff for clinically meaningful change) assessed improvement in abdominal pain (OV28 item 31) and bloating (OV28 item 32) at week 9, comparing treatment arms by Cochran-Mantel-Haenszel (CMH) testing. Additional secondary objectives in the NACT and PS cohorts were assessments of function (physical, role, emotional, social) and HRQoL, as measured by QLQ-C30 functional and global health status/quality of life scales. Exploratory endpoints included mean change from BL in symptoms (QLQ-C30 and OV28) and treatment side-effect bother (FACT-G GP5) in both cohorts. Of 1301 randomized pts, completion rates for each of the 3 questionnaires were 83-100% at BL and >85% on treatment. In NACT pts, mean BL scores were similar in the atezo vs placebo arms for abdominal pain (40.2 vs 44.8) and bloating (50.4 vs 56.3). At week 9, there was no difference between treatments in the proportion of NACT pts with ≥10-point improvement in either symptom (abdominal pain: 69/136 [51%] with atezo vs 77/142 [54%] with placebo, CMH p=0.56; bloating: 74 [54%] vs 89 [63%], CMH p=0.14). Results were consistent when restricted to NACT pts with sufficient BL symptoms to show ≥10-point improvement. There was no difference between treatments in the proportion of NACT pts with improvement in function or HRQoL at week 9. In the PS cohort, similar proportions of pts in each arm showed on-treatment improvement, stabilization, or deterioration in function and HRQoL. In both cohorts, neither arm showed meaningful changes from BL in treatment-related symptoms and similar proportions of pts in both arms reported being 'a little bit' or 'somewhat' bothered by treatment side effects while on therapy. Consistent with PFS results, there were no differences between arms in the proportion of NACT pts with a clinically meaningful improvement in abdominal pain and bloating after 3 cycles of bevacizumab-containing therapy. Pt-reported outcome analyses in both cohorts showed that adding atezo to CPB did not increase treatment burden for pts, thereby demonstrating the tolerability of this 4-drug regimen and providing further insight on the benefit-risk assessment of atezo. [ABSTRACT FROM AUTHOR]

Prospective studies comparing poly(adenosine diphosphate-ribose) polymerase (PARP) inhibitors with standard-of-care (SOC) chemotherapy (CT) in patients (pts) with relapsed ovarian cancer (OC) are currently limited. ARIEL4 (NCT02855944) is a phase III, randomized, open-label, international, multicenter study of the efficacy and safety of rucaparib vs SOC CT as treatment for PARP-inhibitor naïve pts with relapsed high-grade epithelial ovarian, fallopian tube or primary peritoneal cancer, who had a deleterious BRCA1/2 (BRCA) mutation and had received ≥2 prior CT regimens. Pts were randomized 2:1 to oral rucaparib 600 mg twice daily or SOC CT and stratified based on progression-free interval (≥1 to <6 months = platinum resistant; ≥6 to <12 months = partially platinum sensitive; ≥12 months = fully platinum sensitive). Pts in the CT arm with platinum-resistant or partially platinum-sensitive disease received weekly paclitaxel 60-80 mg/m2; pts with fully platinum-sensitive disease received investigator's choice of platinum-based CT (single-agent carboplatin or cisplatin, or platinum doublet [carboplatin + paclitaxel, carboplatin + gemcitabine, or cisplatin + gemcitabine]). Pre-study-treatment plasma samples were assessed for BRCA reversion mutations. The primary endpoint was investigator-assessed progression-free survival (PFS). Secondary endpoints included objective response rate (ORR) per RECIST and safety. Each efficacy endpoint was first evaluated in the efficacy population (randomized pts with deleterious BRCA mutations excluding those with BRCA reversion mutations), stepping down to the intent-to-treat (ITT) population (all randomized pts). A total of 233 pts were randomized to rucaparib and 116 to CT (visit cutoff Sep 30, 2020); 179 (51.3%) had platinum-resistant, 96 (27.5%) had partially platinum-sensitive, and 74 (21.2%) had fully platinum-sensitive disease. A total of 23 pts (6.6%) with BRCA reversion mutations and 1 pt without a BRCA mutation were excluded from the efficacy population. Median PFS was significantly longer with rucaparib vs CT in both the efficacy and ITT populations (Table). In an exploratory analysis of pts with BRCA reversion mutations, median PFS was shorter with rucaparib (n=13) vs CT (n=10); 2.9 vs 5.5 months, hazard ratio 2.769 (95% CI, 0.989–7.755). ORR was not significantly different between the rucaparib and CT arms in both populations (Table). Adverse events were consistent with the known safety profiles of rucaparib and CT. [Display omitted] Patients with BRCA -mutated advanced, relapsed OC who received rucaparib had a significant improvement in PFS vs SOC CT. No new safety signals were identified. This is the first prospective report from a randomized trial demonstrating that the presence of a BRCA reversion mutation predicts for primary resistance to rucaparib. [ABSTRACT FROM AUTHOR]

The Phase III SOLO2 trial (NCT01874353) showed the significant benefit of maintenance olaparib for patients (pts) with platinum-sensitive relapsed ovarian cancer (PSROC) and a BRCA mutation (BRCAm), compared with placebo (median progression-free survival [PFS] 19.1 vs 5.5 months [m], respectively); however, no pts had a confirmed somatic (s) BRCA m and data prospectively evaluating efficacy of olaparib in this pt group were limited. ORZORA (NCT02476968), an open-label, single-arm, multicenter trial, was conducted to assess efficacy and safety of maintenance olaparib in PSROC pts with a BRCA m (s or germline [g]) who were in response to their most recent platinum-based chemotherapy after ≥2 lines of treatment. Pts underwent prospective central screening for tumor BRCA m status (myChoice CDx, Myriad Genetic Laboratories, Inc.), then s or g BRCA m status was determined by central g testing (BRACAnalysis CDx, Myriad Genetic Laboratories, Inc.). Pts received maintenance olaparib (400 mg bid; capsules) until disease progression. Co-primary endpoints were investigator-assessed PFS (RECIST v1.1) in BRCA m and s cohorts, conducted at 60% maturity. Secondary endpoints included time to second progression or death (PFS2), health-related quality of life (HRQoL; FACT-O trial outcome index) and tolerability. An additional exploratory cohort comprised pts with predefined homologous recombination repair gene mutations (HRRm) excluding BRCA m (FoundationOne CDx, Foundation Medicine, Inc.). A total of 181 pts were enrolled in ORZORA (BRCA m n=145 [s n=55; g n=87; n=3 s vs g status unknown]; HRRm n=33; unassigned n=3). Pt characteristics were similar between s and g cohorts: ≥3 prior lines of chemotherapy (38% vs 48%, respectively); partial response to prior platinum (45% vs 49%); tumor BRCA1 -mutated (65% vs 64%). At the data cut-off (April 17, 2020), median follow-up for PFS was 22.3 months. Median PFS was similar in the BRCAm, s and g cohorts, and exploratory HRRm cohort (Figure). Median PFS2 for BRCA m pts was 30.9 m (95% confidence interval [CI] 24.7–40.0; s 24.7 [21.8–36.1]; g 32.5 [25.3–not calculable]). HRQoL was comparable in BRCA m and s cohorts (best overall change from baseline: improved 22 vs 21%; no change 69 vs 68%; worsened 11 vs 12%, respectively). Most common adverse events (AE; n=177 treated pts) were nausea (54% pts), fatigue (43%), anemia (42%) and vomiting (28%). A total of 25% and 35% pts experienced serious and grade ≥3 (anemia 16% pts) AEs, respectively. 5% had an AE leading to treatment discontinuation. A total of 2 new primary malignancies, two acute myeloid leukemia and no myelodysplastic syndrome cases occurred. [Display omitted] PFS in pts with PSROC who received maintenance olaparib was similar irrespective of s or g BRCA m status. Activity of maintenance olaparib was also shown in pts with a non-BRCA HRRm. PFS, HRQoL and tolerability were consistent with previous olaparib studies in this population. Results highlight that PSROC pts beyond those with a g BRCA m can benefit from maintenance olaparib. [ABSTRACT FROM AUTHOR]