This technology includes endometrial cancer cell lines for use in molecular and cellular studies to determine the effects of cancer-associated FBXW7 (F-box and WD repeat domain-containing 7) mutations, including but not limited to biochemical studies, proteomic studies, and drug sensitivity/resistance studies. Clustered Regularly Interspaced Palindromic Repeats (CRISPR) editing was used to knock-in individual FBXW7 mutations into the ARK1 serous EC cell line, which lacks detectable endogenous FBXW7 mutation(s). For each CRISPR-edited cell line, and parental ARK1 cells, STR (Short Tandem Repeat) profiles were generated. STR profiles of CRISPR-edited cell lines authenticated to the parental ARK1 line.