The immunophenotype of GFP+ tumor cells recovered from muscle was highly similar to that of leukemic cells recovered from mice transplanted retro-orbitally with p16p19−/−; Kras(G12V) cells (Fig. 1E), including high levels of CD48 (96.77±3.6%), CD47 (81.09±16.30%), and Mac1 (79.59±18.91%), and low to absent expression of CD4 (26.52±25.54%), B220 (16.77±16.4%), Ter119 (15.5±14.5%), CD71 (30.1±15.4%), Gr1 (7.54±8.4%), and CD8 (9.24±9.05%) (Fig. 2D). This evidence concerns the gene CD48 and neoplasm.