KRAS and neoplasm: However, other studies detected only the KRAS G12V7–16 10-mer peptide and not KRAS G12V8–16 9-mer peptides from primary tumor tissues (49), natural HLA-A*11:01+ KRAS G12V+ Colo668 tumor cells (49), or HLA-A*11:01–engineered natural KRAS G12V+ SW620 tumor cells (7).