Breast cancer and neoadjuvant chemotherapy: indications for and limits of breast-conserving surgery.

Aim: The aim of our study was to determine how many and what subtypes of breast cancer could be treated with breast-conserving surgery after NACT. Another outcome was to determine the applicability of MD Anderson Cancer Center nomogram to predict it.

Material Of Study: We reviewed the histological examinations of 86 performed mastectomies according to the indications to BCS after NACT. For 73 cases, collected all the necessary data, we could use the nomogram available on the MDACC website to calculate the probability of BCS and pCR.

Results: In our experience the BCS rate would increase by 34,1%, from 3,7% to 3.,8%. Patients with Triple Negative and HER2+, ER- more than ER+, show higher rates of pCR and BCS. The MDACC nomogram predicts accurately the probability of pCR and BCS after NACT in HER2 negative cancers but not in HER2 positive ones treated with Trastuzumab. This suggests that a specific nomogram for HER2 positive carcinomas has to be developed.

Conclusion: BCS after NACT is feasible and safe in terms of LRR, DFS and OS, if patients are properly studied and selected. Indication to BCS after NACT needs of a multidisciplinary assessment considering clinical staging, biological characteristics, the radiological response pattern and the expected concordance between imaging and histology.

Key Words: Breast Cancer, Breast-conserving surgery, Neoadjuvant chemotherapy.