Validation of ALDH as a CSC Marker in Dog PDX Tumors. A. A dog sarcoma PDX tumor was allowed to grow to ~ 20 mm in maximal dimension. The tumor was then excised and digested into single cell suspension. B. Tumor cells were sorted by flow cytometry into ALDHbright and ALDHdim populations. 2 × 105 purified cells were implanted subcutaneously into contralateral flanks of NSG mice (N = 4) and allowed to grow. ALDHbright cells established tumors faster and were more rapidly fatal. * P < 0.05 via one-way ANOVA with Tukey’s post-test. C. Representative photograph showing difference in tumor formation between ALDHbright and ALDHdim sarcoma PDX #465049 cells implanted subcutaneously in NSG mice. (TIFF 890 kb
