KRAS and neoplasm: To understand the distribution and phenotype of tumor-specific T cells following implantation of cell lines derived from Pdx-Cre+/− Kras(G12D)+/− Trp53(R172H)+/− Luciferase-SIY+ tumors in mice, we performed multiparameter flow cytometry for SIY-specific T cells in PK5L1940 tumors, TDLN, NDLN, and spleen to look for low incidences of antigen-specific T cells.