Esophageal carcinoma (adenocarcinoma and SCC; 4/163 = 2.5%), stomach adenocarcinoma (9/375 = 2.5%), and ovarian serous cystadenocarcinoma (7/381 = 2%) showed the highest frequencies of KRAS WT amplification (relative CN > 7). Here, KRAS is linked to ovarian serous cystadenocarcinoma.