A Phase III Study of Ceralasertib Plus Durvalumab Versus Docetaxel in Patients With Non Small Cell Lung Cancer (NSCLC) Whose Disease Progressed On or After Prior Anti PD (L)1 Therapy And Platinum Based Chemotherapy

This study will consist of two treatment arms (Groups A and B). Participants will be randomised in a 1:1 ratio to one of the two treatment groups: * Group A: Ceralasertib plus durvalumab combination therapy Each 28-day cycle will begin with ceralasertib administered orally followed by durvalumab administered intravenously. * Group B: Docetaxel monotherapy Each 21-day cycle will begin with the administration of docetaxel.