Ethanol, immunomodulation and cancer.

Abstract

Several major physiological changes or disease states occur more frequently in alcohol abusers or prolonged high users. These include: cancer, immunosuppression, and nutritional deficiencies. They interact with potential enhancement of cancer growth or survival. Clearly alcohol abuse yielding cirrhosis is associated with immunosuppression of cellular immune functions. Severe, prolonged ethanol consumption frequently is associated with one or more nutrient deficiency. Such deficiencies are more common when there are other major problems such as liver or pancreas damage and in prolonged alcohol abusers should influence the host defenses against pathogens and tumors. The amount and frequency of nutritional and immunological deficiencies with "binge" or less severe alcohol abuse is less clear, but animal studies suggest they are frequently present. Clearly, nutrient deficiencies are common in alcohol abusers and could play significant roles in ethanol associated problems including immunosuppression. Data summarized suggest that immunosuppression caused by nutritional deficiencies and/or direct effects of ethanol and its' metabolites on lymphoid cells is a potential component of cancer in alcohol abusers. However the frequent occurrence of nutritional deficiencies, immunosuppression, and certain cancers in severe, prolonged ethanol abusers is an association, not proven cause and effect.