Clinical interest of PD-L1 immuno-histochemistry expression as a predictive factor of Bacillus Calmette Guerin (BCG) efficacy in refractory high-risk non-muscle-invasive bladder cancer (NMIBC).

No association was observed between immuno-histochemistry PD-L1 positivity and ER after BCG therapy. Nevertheless, the relationship between immune infiltrate and PD-L1 positivity confirmed the interest of assessing the immune infiltrate density to define tumor's profile.