SLFN11 and small cell lung carcinoma: Intriguing results from the SWOG1929 trial, a phase II trial assessing the addition of the PARP inhibitor talazoparib to atezolizumab maintenance in ES-SCLC highlighted that biomarker-driven trials in SCLC are possible, even with stratification based on limited tissue, as this trial required SLFN11 positive IHC for enrollment 42.