Itgav+ cells were identified in K14Cre;TRF2f/f;Terc-/- but not K14Cre;TRF2+/+;Terc+/+, K14Cre;TRF2f/f;Terc+/+, nor K14Cre;TRF2+/+;Terc-/- primary tumors by immunofluorescence microscopy (Figure 7B) and comprised 3.9% of cells in double null cancers as shown by flow cytometry (Figure 7C). This evidence concerns the gene TERC and cancer.