Patients with pathologically proven stage III NSCLC will be treated with CIT-induction. In the feasibility phase, the first cohort (cohort 1A) will receive only 1 course of the immunotherapy doublet followed by a single dose of Durvalumab (Figure 1). The 2nd cohort (Figure 1, cohort 2A) will open for inclusion if 5 to 6 out of 6 patients complete CIT-CRT according to the safety rules (paragraph 6.1.3). In next cohort two courses of Tremelimumab and Durvalumab will be administered. The expansion cohort will be opened (Figure 1, cohort 2B) if this is well tolerated. Patients will be enrolled for cohort 1B in case < 5 out of 6 patients complete CIT-CRT in cohort 2A.

