How do you chose between 4 or 6 cycles of chemotherapy in patients with small cell lung cancer?  

Very good question made a bit more straightforward with the publication in NEJM of IMpower 133 for extensive stage disease and recently added to NCCN guidelines as a category 1, preferred first line therapy in ES-SCLC. I typically follow the four cycles as used in IMpower 133 for patients with exten...