Recommendations: An anti-PD-L1 inhibitor (atezolizumab [I, A; ESMO-MCBS v1.1 score: 3] or durvalumab [I, A; ESMO-MCBS v1.1 score: 3]) in combination with four to six cycles of a platinum and etoposide can be offered to all patients with treatment-naive extensive-stage SCLC, a PS of 0-1 and no contraindications for immunotherapy [I, A].