The consequences of neoadjuvant chemotherapy (NAC) for PD-L1 activity in triple-negative breast cancers (TNBC) are not well-understood. This is an important issue as PD-LI might act as a biomarker for immune checkpoint inhibitors’ (ICI) efficacy, at a time where ICI are undergoing rapid development and could be beneficial in patients who do not achieve a pathological complete response. We used immunohistochemistry to assess PD-L1 expression in surgical specimens (E1L3N clone, cutoff for positivity: ≥1%) on both tumor (PD-L1-TC) and immune cells (PD-L1-IC) from a cohort of T1-T3NxM0 TNBCs treated with NAC. PD-L1-TC was detected in 17 cases (19.1%) and PD-L1-IC in 14 cases (15.7%). None of the baseline characteristics of the tumor or the patient were associated with PD-L1 positivity, except for pre-NAC stromal TIL levels, which were higher in post-NAC PD-L1-TC-positive than in negative tumors. PD-L1-TC were significantly associated with a higher residual cancer burden (p = 0.035) and aggressive post-NAC tumor characteristics, whereas PD-L1-IC were not. PD-L1 expression was not associated with relapse-free survival (RFS) (PD-L1-TC, p = 0.25, and PD-L1-IC, p = 0.95) or overall survival (OS) (PD-L1-TC, p = 0.48, and PD-L1-IC, p = 0.58), but high Ki67 levels after NAC were strongly associated with a poor prognosis (RFS, p = 0.0014, and OS, p = 0.001). A small subset of TNBC patients displaying PD-L1 expression in the context of an extensive post-NAC tumor burden could benefit from ICI treatment after standard NAC.

Objective: To study fertility concerns and oncofertility practices at time of breast cancer (BC) diagnosis. Design: The FEERIC study (Fertility, Pregnancy, Contraception after BC in France) is a prospective, multicenter study. Setting: Web-based collaborative research platform Seintinelles . Patients: 517 patients with prior BC diagnosis free from relapse and aged 18 to 43 years at inclusion (from 12 ^th March 2018 to 27 ^th June 2019). Intervention: Baseline online self-administered questionnaires. Main Outcome Measure: Fertility preservation procedures at BC diagnosis. Results: Median age at BC diagnosis was 33.6 years and 424 patients (82.0%) received chemotherapy. Overall, 236 (45.6%) patients were offered specialized oncofertility counseling, 124 (24.0%) underwent one or more FP procedures with material preservation (oocytes n=108, 20.9%; embryos n=31, 6.0%; both oocytes and embryos n=13, 2.5%; ovarian cryopreservation n=6, 1.2%) and 78 patients received gonadotropin-releasing hormone agonists (15.1%). With a median follow-up of 26.7 months after the end of treatments,133 pregnancies (25.7%) had occurred in 85 patients (16.4%), including 20 unplanned pregnancies (15.0%). Most of the pregnancies were spontaneous (n=113, 87.6%), while 16 (12.4%) required medical interventions. Patients who had an unplanned pregnancy were less likely to have received fertility counseling (p=0.02) and contraceptive counseling (p=0.08) at BC diagnosis. Conclusion: Most of the patients were not offered proper specialized oncofertility counseling at the time of BC diagnosis. Spontaneous pregnancies after BC were very much more frequent than pregnancies resulting from the use of cryopreserved gametes. Adequate contraceptive counseling seems as important as information about fertility and might prevent unplanned pregnancies.