Based on a clinical trial, in which patients with unresectable bronchogenic cancer were treated with a combination of vitamin A plus chemotherapy, or vitamin A plus radiotherapy, a study was initiated in which vitamin A alone was given for tumor treatment. 9 male patients with metastatic unresectable squamous cell carcinoma of the lung were treated with vitamin A palmitate or 13-cis vitamin A acid. Up to seven treatment courses were given during a period of 60 weeks. Through weekly evaluation of the patients' immune status, an immune potentiating effect of the vitamin A therapy could be demonstrated. An increase of lymphocyte blastogenesis response to PHA which is significant (p less than 0.001) compared with the pretreatment values, was found in all patients at the end of one vitamin A treatment course. Increased delayed cutaneous hypersensitivity reactions were observed also in all patients. The immune potentiating effects of vitamin A therapy, as well as the demonstrated direct effect on the tumor, introduces a wide range of combination therapies.
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