A cross‐sectional study of vitamin intake in postoperative non‐small cell lung cancer patients

Abstract

Background and Objectives: This cross-sectional study of postoperative non-small cell lung cancer (NSCLC) patients examined possible effects of vitamin intake and folate status on disease-free survival. Methods Supplemental vitamin usage, dietary vitamin intake (Willett Food Frequency Questionnaire), red blood cell (RBC) folate, and serum folate concentrations were assessed in patients with a history of NSCLC. Exclusion criteria included factors that alter folate status or that are associated with altered nutritional habits: (1) evidence of cancer on history, physical, or chest radiograph; (2) tobacco, alcohol ingestion (>2 drinks/day), or cancer treatment within 3 months; (3) use of folate antagonists; and (4) age <60 years. Results 36 subjects were evaluated. The median disease-free censored survival was 24 months (range 4–41). Nineteen of 36 patients (53%) reported vitamin supplementation. Vitamin users had a longer median censored survival compared with nonusers (41 months versus 11 months; P = 0.002). With adjustment for cancer stage, the association between RBC folate and censored survival (r = 0.35; P = 0.055) and between serum folate and censored survival (r = 0.32; P = 0.083) approached statistical significance. Conclusions NSCLC patients who took vitamin supplements were more likely to be long-term survivors in the patients studied; a similar trend toward long-term survival was seen among patients with higher circulating folate concentrations. J. Surg. Oncol. 68:231–236, 1998. © 1998 Wiley-Liss, Inc.