ALDH1A1 and neoplasm: In tumor xenografts resected at day 33 post‐implantation, no differences in the expression of pAKT, pSTAT3, ALDH1, or vimentin could be detected in the HCT116 or the HCT116 + PC groups, consistent with an early effect of PC and their rapid substitution by host cells (Fig. S5).