Clinical responses to PD-1 inhibition and their molecular characterization in six patients with mismatch repair-deficient metastatic cancer of the digestive system. - Hirsch, Daniela; Gaiser, Timo; Merx, Kirsten; Weingaertner, Simone; Forster, Michael; Hendricks, Alexander; Woenckhaus, Matthias; Schubert, Thomas; Hofheinz, Ralf-Dieter; Gencer, Deniz (Journal of Cancer Research & Clinical Oncology, 2021)