Treatment of patients with triple negative breast cancer (TNBC) remains one of the most difficult problems in clinical oncology. Despite the negative prognosis for TNBC, there exists the group of patients with better response to the therapy and better prognosis, which proves the heterogenity of TNBC. The aim of the study was to evaluate the predictive role of tumor infiltrative lymphocytes (TIL) and their subpopulations (CD4+, CD8+ and FOXP3) in patients with TNBC. The predictive role of clinical, morphologic and immunohystochemical tumor features on neoadjuvant chemotherapy (NACT) efficacy was assessed in 52 TNBC patients. The risk of incomplete pathomorphologic response after NACT is related with 2 biomarkers: level of TIL and stromal CD4+ lymphocytes. The increase of TIL level decreases of the risk of incomplete pathomorphologic response (P = 0.01), ОR = 0.07 (95 % CІ 0.01–0.55) while standartization on CD4+ level. The high level of TIL at the time of diagnosis significantly decreases the risk of incomplete pathomorphologic response (OR = 0,2; P = 0,02). The group of patients with the ratio of stromal lymphocytes CD4low/CD8low had the eight-fold increase of the risk of incomplete pathomorphologic response comparing with the group with the ratio CD4high/CD8high (ОR = 8,0; Р = 0,03); the patient with the ratio stromal lymphocytes CD8low/ FOXP3low had the almost two-fold increase of the risk of incomplete pathomorphologic response comparing with the group with the ratio CD8high/FOXP3high (ОR = 2,1; Р = 0,03).
PO-344 miR-302b as adjuvant therapeutic tool to improve chemotherapy efficacy in human triple negative breast cancer