Vactosertib plus pembrolizumab in patients with non-microsatellite instability-high metastatic colorectal or gastric cancer: a multicenter, phase Ib/IIa study

K Keun-Wook Lee (Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, South Korea) Y Young Suk Park J Joong Bae Ahn Y Young Iee Park J Jin Won Kim J Ji-Won Kim Y Yong Sang Hong S Sun Young Kim J Jeeyun Lee (Samsung Medical Center, Seoul, South Korea) S Seung Tae Kim H Han Sang Kim M Minkyu Heo S Saerom Kim S Seong-Jin Kim T Tae Won Kim (Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea)