KRAS and neoplasm: In our previous study we examined the effects of ribitol on MCF-7 tumor cells in vivo through a xenograft study, to observe effects related to α-DG glycosylation.[11] The effect of ribitol on KRAS expression was also evaluated by Real-Time PCR on xenograft MCF-7 tumors in control mice and mice treated with 10% ribitol ad libitum for 45 days.