Objective: Triple-negative [estrogen receptor (ER)-/progesterone receptor (PR)-/HER2-] breast cancer (TNBC) accounts for ∼ 15% of overall breast cancer and associated with a poor prognosis. There is a short of standard adjuvant chemotherapy regimens for TNBC. A number of studies have shown that TNBC might be sensitive to cisplatin and carboplatin on the basis that dysfunction of BRCA1 and its pathway is associated with a specific DNA-repair defect, but data of adjuvant setting about this is limited.
Methods: From January 2010 to September 2011, 95 early triple-negative breast cancer patients confirmed by pathology were randomly assigned to receive TP (docetaxel 75 mg/m², carboplatin AUC = 5, day 1, 21 days a cycle for 6 cycles) or EC-T (epirubicin 90 mg/m², cyclophosphamide 600 mg/m², d1, 21 days a cycle for 4 cycles, followed by docetaxel 80 mg/m², d1, 21 days a cycle for 4 cycles) chemotherapy. Adjuvant radiation therapy was given selectively after chemotherapy. Here we report a preliminary safety analysis with the chi-square test.
Results: Seventy-six out of the 95 patients had completed the chemotherapy and could be assessed for the safety profiles of the regimens. Thirty-seven of them were in the EC-T group with a median age of 47 years, and 21 out of these 37 patients were premenopausal (56.8%). Another 39 patients came from the TP group with a median age of 46 years, and 22 out of these 39 patients were premenopausal (56.4%). All of the 37 patients in EC-T group completed the planned treatment whereas 2 patients of the 39 cases in TP group did not because of bone marrow suppression. During the treatments, 9 patients had dose adjustment in each group. Adverse events of grade 1/2 were common. Specific incidence of adverse events with grade 3/4 in each group was as follows: alopecia, 29.7% vs. 10.3% (P = 0.033), vomiting 21.6% vs. 7.7% (P = 0.085), leukopenia 54.1% vs.25.6% (P = 0.011) and neutropenia 51.4% vs. 35.9% (P = 0.174). Other grade 3/4 toxicities were rare. All the adverse events (except peripheral neuropathy and pigmentation) recovered within 1 month after the chemotherapy.
Conclusion: Both EC-T and TP regimens as adjuvant chemotherapy are safe and tolerable for the treatment of triple-negative breast cancer patients, while the TP regimen has advantages with less grade III/IV alopecia and leukopenia.