We report a case in which atezolizumab was efficiency in PD-L1 (SP142)-positive lung and breast double cancer...Pretreatment diagnosis was lung adenocarcinoma, cT2a, N2/3, M1b/1c(HEP, OSS), Stage III A/B or IV A/B(PD-L1 positive), and right breast cancer, T4b, N2, M0/1 (HEP, OSS, LYM), Stage III B or IV triple-negative(PD-L1 positive)double cancer. We underwent surgery(mastectomy with axillar lymph nodes dissection), followed by immunochemotherapy(atezolizumab, carboplatin, paclitaxel)and it was efficiency.