KRAS and neoplasm: Several miRNAs, including miR-143, miR-145, let-7 and miR-18a∗, act as tumor suppressors and repress the expression of KRAS [35] and vice-versa, KRAS regulates the expression of different oncogenic miRNAs, including miR-200c, miR-221/222, miR-210 and miR-181∗ [36].