Abstract P3-07-13: Neoadjuvant composite score as a prognostic marker in early and locally advanced triple negative breast cancer

Aim Triple negative subtype (TNBC) is an aggressive breast cancer with inferior survival. Pathological CR (pCR) is a good surrogate endpoint for survival among patients receiving neoadjuvant chemotherapy (NACT). We attempted to validate the composite score(CPS) (Jaccqueline et al, J Clin Oncol 26:246-252) combining clinical and pathological variables among TNBC patients receiving NACT at our center. Methodology Data of patients with TNBC who underwent NACT between January 2014 to July 2017 was retrospectively analysed. The composite CPS score included cTN stage and y pTN stage, and ranged from 0 to 4. This was calculated using an online software (http://www3.mdanderson.org/app/medcalc/index.cfm?pagename=bcnt). The scores obtained from the calculator was used to develop a risk grouping into low risk (0,1) and High risk (2,3,4). Overall survival (OS)and disease free survival (DFS) were calculated using the Kaplan-Meier method and differences was examined using the log rank test. Results Seventy-eight patients with TNBC [median age: 45 (24-75)] had received NACT (anthracyclines and taxanes). Early and locally advanced breast cancer constituted 17 (21.8 %) and 61 (78.2%) respectively and 22 (28.2 %) achieved pCR. After a median follow up of 28 months (5-62), 3-yr DFS and OS were 59% and 82% respectively for the entire population. The 3-yr DFS in low (n=18) and high risk (n=60) patients was 85.7% and 51.4% respectively (p=0.032). The 3-yr OS in the low and high risk was 93% and 79% respectively(p=0.28, NS). Conclusion Our study supports the use of the composite clinical pathological score (CPS) as a prognostic marker in patients with non-metastatic triple negative breast cancer. The risk stratification developed may help identify patients who may require additional adjuvant therapy. Citation Format: Biswajit Dubashi, Smita Kayal, Kirankumar Matta, Divya bala Thumaty, Nisha Yadav, D Kadambari, Pampa ch Toi, K Gunaseelan, Prasanth Ganesan. Neoadjuvant composite score as a prognostic marker in early and locally advanced triple negative breast cancer [abstract]. In: Proceedings of the 2019 San Antonio Breast Cancer Symposium; 2019 Dec 10-14; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2020;80(4 Suppl):Abstract nr P3-07-13.