Association of tumor-infiltrating lymphocytes before and after neoadjuvant chemotherapy with pathological complete response and prognosis in patients with breast cancer.

Pre-NAC TIL level can predict pCR and DFS in patients with breast cancer receiving NAC. For patients without pCR, pre-NAC TIL, and TIL category change, but not post-NAC TIL, were significantly associated with DFS.