[Metabolism of vitamins B1 and PP and their use in oncological practice].

Blood of patients with gastric tumor was studied after their admission to the hospital and after the chemotherapeutic course. Formation of the tumor was accompanied by development of hypovitaminoses B1 and PP. The vitamin deficiency was more distinct after treatment of the patients with cyclophosphan: content of thiamine diphosphate (TDP) was decreased by 40%; NAD+NADP, by 30% and NADH+NADPH, by 20%.