This study will be composed of 2 stepms. First step will be a phase I with the aim to establish the recommended safety scheme of administration (concomitant or sequential) of tiragolumab + atezolizumab + SBRT. The phase I will enrolled only patients from the cohort 1 (metastatic non-small cell lung cancer).~The second step will be an expansion cohorts phase at the recommended scheme of administration. The second step will enrolled patients from 4 different cohorts (metastatic non-small cell lung cancer, metastatic bladder cancer, metastatic renal cell carcinoma, metastatic head and neck carcinoma).
This study (phase I clinical trial and expansion cohorts) will evaluate safety and efficacy of combination of atezolizumab and tiragolumab, with concomitant or sequential SBRT for four oligometastatic cancer cohorts. This study will allow to developpe one or several randomized Phase II clinical trials for the more promising indications