MST1R and Merkel cell skin cancer: As mutations within the tyrosine kinase domain of MST1R have been identified in Merkel cell carcinoma and Gastroesophageal adenocarcinoma (36, 37), we screened DNA from our panel of MPM cell lines and the 17 fresh-frozen surgical samples for the presence of the R1018G (36) or R1194H (37) mutations.