SAMSN1 and neoplasm: While the numbers of 5TGM1‐EV cells in the BM expanded over time, the numbers of 5TGM1‐Samsn1 cells did not significantly differ between day 1 and 21 post‐tumor cell injection (p < 0.0001, two‐way ANOVA with Sidak's multiple comparison test; Figure 3A,B).