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PURPOSE There are sparse data in patients with human epidermal growth factor receptor 2 (HER2)–positive breast cancer with brain metastases from real-world settings, especially where access to newer targeted therapies is limited. METHODS This was a single institution, retrospective cohort study of patients with HER2-positive breast cancer diagnosed between January 2013 and December 2017 to have brain metastases and treated with any HER2-targeted therapy. The main objectives were to estimate progression-free survival (PFS) and overall survival (OS) from the time of brain metastases. RESULTS A total of 102 patients with a median age of 52 (interquartile range, 45-57) years were included, of whom 63 (61.8%) had received one line and 14 (13.7%) had received two lines of HER2-targeted therapies before brain metastasis, 98 (96.1%) were symptomatic at presentation, 22 (25.3%) had solitary brain lesion, 22 (25.3%) had 2-5 lesions, and 43 (49.4%) had ≥ 5 lesions. Local treatment included surgical resection in nine (8.9%) and radiotherapy in all (100%) patients. The first HER2-targeted therapy after brain metastasis was lapatinib in 71 (68.6%), trastuzumab in 19 (18.6%), lapatinib and trastuzumab in three (2.9%), trastuzumab emtansine in four (3.9%), and intrathecal trastuzumab in five (4.9%) patients. At a median follow-up of 13.9 months, the median PFS and OS were 8 (95% CI, 6.2 to 9.8) months and 14 (95% CI, 10.8 to 17.2) months, respectively, with a 2-year OS of 25% (95% CI, 16.7 to 34.4). The median PFS in patients who received lapatinib-capecitabine regimen (n = 62) was 9.0 (95% CI, 7.3 to 10.7) months. CONCLUSION There was a substantial clinical benefit of local and systemic therapy in patients with brain metastases and HER2-positive disease in a real-world setting with limited access to newer HER2-targeted drugs.

568 Background: Axillary lymph node metastasis is still the important prognostic factor in the management of breast cancer (BC). Where we have moved towards axillary conservation in clinically node negative (cN0), the debate on what after 1-2 sentinel lymph nodes positive (SLN+ve) still continues. The ideal situation would be wherein we can accurately predict which patient has a risk of additional non SLN+ve. Several nomograms have been developed to predict the risk of NonSLN+ve. But in view of the differences in tumor size and nodal burden between our patients and the western data, we conducted a study to validate some of these nomograms in our cohort of early BC with positive LN on Low axillary sampling (LAS). Methods: Clinico-pathological data was collected for operable BC (OBC) with cN0 who underwent upfront SLNB or AS. This was entered into the various nomograms and the probability of the Non SLN+ve was calculated. Nomograms with AUC of greater than 0.7 were pre-defined as considerable discrimination. Results: From 2013 to 2018, 2350 women with cN0 OBC underwent LAS. Of which, 670 (28.5%) had a positive node on LAS. Median pT size was 3 cm with 327 (48%), LVI +ve 152 (77%) ENI +ve, 525 (78.4%) Hormone receptor +ve and 485 (72.4%) grade 3 tumors. Of 670, 239 (35.7%) had a NonSLN+ve on completion axillary dissection. The AUC values for nomograms included,ie. MSKCC, MDAnderson, Tenon, Cambridge, Shanghai, Mayo clinic and Turkish were 0.769, 0.77, 0.55, 0.74, 0.65, 0.529, 0.563 respectively. Only three nomograms, MDA, MSKCC and Cambridge had an AUC of more than 0.7. However, they were associated with poor sensitivity and specificity and high FNR (Table) making them clinically unreliable for this cohort. Conclusions: All 7 nomograms were not validated in our study. The larger T size and higher nodal burden of our cohort may be responsible for the same. We thus need to develop an Indian nomogram to predict the risk of non SLN+ve for our patients. [Table: see text]

Purpose In a previous retrospective audit from our institution, access to human epidermal growth factor receptor 2 (HER2) –targeted therapy (H2T) in patients registered and treated in 2008 was reported, wherein only 38 (8.61%) of 441 patients received some form of H2T. Three developments occurred in subsequent years that potentially affected access to H2T at our institution—that is, a patient access program supported by the innovator pharmaceutical company, a generous philanthropic donor, and the use of biosimilars. Methods To evaluate the cumulative impact of these developments on access to trastuzumab, we reviewed access to H2T in a recent cohort of patients with breast cancer registered in at our institution. Results In 2016, 4,717 new patients with breast cancer were registered at our institution. Among these patients, HER2 3+ expression by immunohistochemistry or fluorescent in situ hybridization (FISH) was reported in 828 patients (22.77%). Assuming the same 33.22% amplification rate in the 343 patients who did not undergo FISH testing, there were potentially 114 more patients with HER2-amplified tumors. Thus, the final number of HER2-overexpressing/-amplified tumors is estimated to be 942 in 2016 (729 HER2 immunohistochemistry 3+, 99 known FISH amplified, and 114 estimated FISH amplified). Of these 942 patients, 13 were not deemed suitable for H2T and 94 did not follow-up for additional treatment at our institution. The remaining 835 patients were eligible to receive H2T and were analyzed for access to this treatment. Overall, 444 (53.2%) of these 835 patients received trastuzumab for durations that ranged from 12 weeks to 12 months in the (neo)adjuvant setting or other durations in the metastatic setting. This is in contrast to the previously reported 8.61% use of H2T in the cohort of patients registered in 2008. Conclusion We suggest that other institutions, especially public hospitals that treat underprivileged patients, make concerted efforts to increase access to potentially curative treatments, such as trastuzumab, using targeted programs and philanthropic support, and consider using a shorter duration of 12 weeks of trastuzumab to improve patient outcomes. AUTHORS' DISCLOSURES OF POTENTIAL CONFLICTS OF INTEREST The following represents disclosure information provided by authors of this manuscript. All relationships are considered compensated. Relationships are self-held unless noted. I = Immediate Family Member, Inst = My Institution. Relationships may not relate to the subject matter of this manuscript. For more information about ASCO's conflict of interest policy, please refer to www.asco.org/rwc or ascopubs.org/jco/site/ifc . No COIs from the authors.

e19012 Background: AIDS related non Hodgkin’s Lymphoma (ARL) remains a major cause of morbidity and mortality .There are limited prospective studies on ARLs in Indian population. We studied the clinical profile and outcome of patients with ARL . Methods: Consecutive patients diagnosed with ARL in the period February 2014-march 2016 who were treatment naïve were included in the study. Details of HIV and ARL, treatment details , complications and outcome were recorded. The primary objective was overall survival(OS), secondary objectives were response rates correlation of overall survival with CD4 count, IPI, duration of HIV, histopathology and stage of NHL. Survival was described with the Kaplan-Meier method, and effect of predictor variables was tested with the log-rank test. Results: 42 patients(28 males) with a median age 45.5 years were included in the study . The commonest types of NHL were DLBCL 22 (52.38 %) and plasmablastic lymphoma 14 (33.33%). HIV infection was detected at the time of lymphoma diagnosis in 21 (50%). The median CD4+ T cell count was 137 cells/mm3 . 32 (76.19%) had stage III/IV disease and and 35(83.3%) had extranodal involvement. IPI score was >2 in 20/40(50%). 30/42 patients received chemotherapy of these 21 received atleast 4 cycles. 19 patients received CVEP regimen , 8 REPOCH and 3 others . NNRTI plus 2 NRTI combination was the HAART regimen in 26/30(86.6%) patients. Grade 3-5 febrile neutropenia was seen in 17/30 (56.6%) . Response was assessed using PET-CT scan in 22 patients ,16 (72.7%) had complete response .16/30 patients expired , 8 of these were due to infections . Median survival was 10 months (0.0-20.4 months). The estimated 2 year overall survival is 43.6 % . Patients with early stage disease had better overall mean survival (p=0.01). Type of NHL, IPI, CD 4+ T cell count, HAART prior to NHL treatment did not affect overall survival . Conclusions: Patients of ARL present at a younger age ,with higher grade and advanced disease. Higher proportion of plasmablastic lymphomas were seen in our study as compared to western data. Though most patients achieve complete response the overall survival is low . Myelosuppression and associated infections continues to be a challenge in the management of ARL.

e19509 Background: To evaluate the prognostic factors and treatment outcome of Indian patients with primary Diffuse Large B-Cell Lymphoma (DLBCL) of the stomach treated at a single institution. Met...

e21000 Background: HL is one of the most curable malignancies of childhood. There is limited published data on outcome from India on local biology and prognostic factors. Methods: 152 advanced stag...

e19503 Background: Biological heterogeneity of diffuse large B-cell lymphomas (DLBL) is reflected in variable outcomes with R-CHOP. Clinicopathological features like high IPI, underlying acquired immunodeficiency, non-germinal center phenotype, primary mediastinal B-cell histology and Bcl-2 positivity correlate with adverse biology. Effect of adverse biological attributes is also reflected in outcomes B-cell lymphoma intermediate between diffuse large cell B-cell and Burkitt’s lymphomas (BCLU) and Burkitt’s lymphoma in elderly and HIV-positive individuals with low CD4 counts. Given the promising efficacy of R- EPOCH in poor-risk DLBL we used it in therapy of aggressive B-cell NHL. Methods: From May 2010 to December 2012 patients with de-novo aggressive B-cell lymphomas with adverse clinicopathological features (DLBL with multiple extranodal sites, high IPI, primary mediastinal B-cell lymphoma, BCLU, Burkitt’s lymphoma in elderly or in HIV-positive individuals) were treated with R-EPOCH. Demography,stage, bulk of disease, IPI, CD4 counts, grade 3/4 toxicities and death were recorded. Responses were evaluated at mid and end of therapy. Overall and progression-free survivals were calculated. Immunohistochemistry was used to classify the germinal center and non-germinal center phenotype. Results: 33 patients (males-21, female-12) were treated with median of 6 cycles (range 3-6) of R-EPOCH. Histologicalsubtypes distribution was- DLBL-16, BL-8, BCLU-5, and PMBL-4. Sixty percent of DLBL were non-germinal center type and bcl-2 positive. Median age was 33 years (range 15-73 years). More than 2/3 of patients had stage 3/4 bulky disease with high IPI. Twelve patients were HIV positive with median CD4 count of 173/µL (range 43-359/µL). Complete responses were seen in 66.7% at interim evaluation and in 90% at the end of therapy. At a median follow up of 8 months, 1- year overall survival and progression- free survival were 72.5% and 90% respectively. Two patients died due to therapyand grade 3/4 toxicities were seen in 10% patients. Conclusions: R-EPOCH regimen is efficacious in patients with poor-risk aggressive B-cell NHL however longer follow-up is needed.

1108 Background: Post neoadjuvant chemotherapy (NACT) sentinel node biopsy (SNB) is not a standard of care due to the wide variability in false negative rate (FNR), varying from 5.7% to 33%. In operable breast cancer (OBC), FNR of less than 10% is acceptable. We attempted to find out the reliability of low axillary sampling(LAS), with dissection limited below the first intercostobrachial nerve, to correctly identify the node negative axilla in the post NACT clinically node negative (N0) patients. Methods: Women with large operable (LOBC) and locally advanced breast cancer (LABC), post-NACT clinically N0, underwent concomitant blue dye-colloid guided SNB and LAS. The identification rate, FNR, and negative predictive value (NPV) of both procedures were compared. Results: Post-NACT 209 eligible women underwent combined LAS and SNB procedure. At presentation, the tumors were large (median 5.0 cm) with 70% clinically palpable nodes. All patients received 4 cycles of neo-adjuvant anthracycline-based chemotherapy and were clinically node negative after chemotherapy. SNB was defined as blue and/or hot node plus palpable node(s). A blue or hot node (median 2 nodes) was identified in 93.8%, and median of 5 sentinel nodes were removed. The false negative rate of SNB was 15.3% (95% CI 8.7%-25.3%). The LAS technique comparatively had nodal yield in 98.5% with median 8 nodes removed; and FNR 8.5% (95% CI, 4.2%-16.6%, p=0.19). Comparative NPV for LAS and SNB were 94.6% and 91.8% respectively. Conclusions: Axillary sampling results for FNR and NPV are similar if not superior to SNB and could be a reliable method of axillary nodal evaluation in advanced breast cancers following neo-adjuvant chemotherapy.

146 Background: Ductal carcinoma in situ (DCIS) identified by screening mammography accounts for 20% of breast cancer diagnoses, and microinvasion (DCIS-M) is found in 5%-10%. There are no defined treatment guidelines for palpable DCIS or DCIS-M. In the developing world wherein screening mammography is controversial due to a predominantly premenopausal population, most women with DCIS present with a palpable lump in the breast. The objective of this study was to evaluate whether disease in these patients with palpable DCIS have been treated differently from screen detected DCIS. Methods: Annually we register 3,000 new cases of breast cancer of which DCIS constitute a small fraction. Over a period of 12 years (1998-2010) we registered 71 cases of DCIS for treatment. A retrospective analysis of these was performed. Results: Of the 71 patients reviewed, 35 (49.2%) had foci of microinvasion. The median age of presentation was 49 years and mean tumor size was 2.3 cm; all presented with palpable breast lumps. Of the 36 women with DCIS alone Tsize was > 2 cm in 26 (72.2%), 14 (38.9%) had presence of comedo necrosis and 1 (2.7%) had positive lymph nodes on histopathology. Adjuvant chemotherapy was given to 4 (11.11%). Of the 35 women with DCIS-M Tsize was > 2 cm in 23 (66%), 10 (29%) had comedo necrosis (compared to 38.9% in pure DCIS p=0.45), 3 (8.5%) had positive lymph nodes, and 17 (48.6%) received chemotherapy. We compared this data to that of women treated for invasive ductal carcinoma with pTsize Conclusions: DCIS presenting in these palpable lesions poses a clinical dilemma for the use of adjuvant therapy. Over 49.2% of the palpable DCIS showed evidence of microinvasion. We thus need to consider the role of adjuvant chemotherapy when treating women with palpable DCIS.

11593 Background: Taxanes have been shown to induce high pathologic response rates in patients with early breast cancer. We studied the use of single agent weekly paclitaxel as anterior chemotherapy in large operable (tumour size >5 cm) breast cancer (LOBC) and locally advanced breast cancer (LABC). Methods: In this prospective study, we enrolled women above 18 years with T3–4 any N and N2- 3 any T with nonmetastatic disease. Patients with inadequate organ function were excluded. Tumor size was documented at baseline and after completion of neoadjuvant chemotherapy. After diagnostic biopsy, patients were given paclitaxel (100 mg/m2) weekly for 8 weeks. This was followed by breast conservative surgery or mastectomy (as per surgeon’s discretion) and adjuvant chemotherapy with 4 cycles of FEC (5-fluorouracil 500 mg/m2, epirubicin 90 mg/m2, cyclophosphamide 500 mg/m2), radiotherapy and hormone therapy (if indicated). The primary objectives included assessment of clinical and pathologic response after primary ...

10661 Purpose: The aim of the study is to evaluate the safety and feasibility of radical brachytherapy for accelerated partial breast irradiation (APBI) and to study the outcome with respect to local control and survival. Materials and Methods: During May 2000 to December 2004, 115 women participated in the ongoing prospective study of APBI using interstitial brachytherapy as the sole modality of radiation for early breast cancer. Women with age > 40 years, single tumour up to 3 cm without diffuse microcalcification and clinically negative axilla were considered suitable. Brachytherapy was done either intraoperatively during the breast conserving surgery or postoperatively using 2–4 planes. Tumor bed demarcation was done with radiopaque clips placed during surgery, CT scans, ultrasonography and/or fluoroscopy. Cavity with 1cm margin was treated based on orthogonal pair of X rays to a dose of 34 Gy in 10 fractions over 1 week with twice daily fractionation using high dose rate iridium source. Results: Implant was done postoperatively in 35 patients while in remaining patients it was done intraoperatively. Implant procedure was tolerated well by all the patients. In 8 patients only 3 or 4 fractions of HDR Brachytherapy were delivered and this was followed by 45 Gy/25 # whole breast radiation therapy for following reasons: positive nodes (4), EIC positive (3) and poor implant coverage (1). At a median follow up of 23 months, the actuarial local control rate is 100%. Three year actuarial disease free survival is 93% while the overall survival is 100%. Complications included fat necrosis in 5 and wound gape in 4 patients. Cosmesis was good to excellent in 60% of the patients. Conclusion: In this ongoing prospective study, APBI using radical interstitial implant was well tolerated and appears to be safe and feasible in appropriately selected patients. Further follow up is needed for confirm the long term safety of the procedure. No significant financial relationships to disclose.