did not reach statistical significancep = 0.0164
The PD-1 inhibitor, pembrolizumab, combined with platinum/etoposide numerically improved mOS compared to platinum/etoposide alone in the phase III KEYNOTE-604 trial, but this did not reach statistical significance (10.8 vs 9.7 months, p = 0.0164). 37 , 38 Ipilimumab was investigated in a phase II trial with platinum/etoposide first-line but did not improve mOS compared to platinum/etoposide alone. 39 The TIGIT inhibitor, tiragolumab, was investigated in the SKYSCRAPER-02 phase II trial in combination with carboplatin/etoposide but did not produce an improvement in mPFS or mOS. 40 Additionally, ICIs have been investigated as a maintenance-only therapy.