In contrast to other soft tissue sarcomas, GIST shows enhanced numbers of immune checkpoint-negative CD8 T cells. (March 2019) - Klaver, Y.; Lamers, C.H.J.; Rijnders, M.; Oostvogels, A.; Wijers, R.; Smid, M.; Grunhagen, D.; Verhoef, K.; Sleijfer, S.; Debets, R.