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Background : Taxane-based regimens that are frequently used in adjuvant chemotherapy in early triple-negative breast cancer (TNBC) include a three-drug regimen (TAC and AC-T) and a two-drug regimen (TA and TC). Whether pathological lymph node stage guides taxane-based de-escalating chemotherapies in TNBC in adjuvant setting is still unclear. Methods : We retrospectively examined 381 patients with early TNBC over a median follow-up period of 75.9 months and compared the disease-free survival (DFS) and overall survival (OS) of patients who received adjuvant taxane-based three-drug chemotherapy and two-drug chemotherapy according to pathological lymph node stage (negative, pN0; 1-3 positive, pN1; 4-9 positive, pN2). Results : In 222 pN0 patients, the taxane-based three-drug regimen was not superior to the two-drug regimen. In 159 pN1-2 patients, the taxane-based three-drug regimen significantly improved DFS (5-year DFS rate, 78.2% vs. 46.9%; log-rank p =0.0002) and OS (5-year OS rate, 90.7% vs. 64.3%; log-rank p =0.0001) compared with the two-drug regimen. In a multivariable Cox regression analysis of pN1-2 patients, after adjustment for clinical characteristics, the taxane-based three-drug regimen significantly decreased the risk of recurrence (adjusted HR, 0.37; 95% CI, 0.22 to 0.64; p =0.0004) and death (adjusted HR, 0.22; 95% CI, 0.10 to 0.48; p =0.0001) compared with the two-drug regimen. Conclusions : The taxane-based chemotherapy triplet is superior to the chemotherapy doublet in patients with one to nine positive lymph nodes but not node-negative TNBC in adjuvant setting. These data suggest that pathological lymph node stage leads to de-escalating chemotherapy strategies in operable TNBC patients.

journal of cancer

The taxane-based chemotherapy triplet is superior to the doublet in one to nine node-positive but not node-negative triple-negative breast cancer: results from a retrospective analysis