For ES-SCLC with a distant cCR and local cPR after systemic therapy sustained for at least 1 year, how would you approach consolidative thoracic RT?   

The CREST trial by Slotman referenced enrolled patients with the findings above after 4-6 cycles of chemotherapy, and required patients initiate radiation therapy within 6 weeks. If this patient truly has not progressed 1 year after chemotherapy, I am not clear on what the additional benefit of radi...