KRAS and neoplasm: Gene set enrichment analysis (GSEA) revealed that the Kras signaling activated gene set was significantly decreased in let‐7b‐treated tumor cells compared to the Scr control tumor cells (Figure S2A, Supporting Information; normalized enrichment score (NES) value = −2, p‐value = 0.004, and false discovery rate (FDR) value = 0.0285).