title: Assessment of a dietary questionnaire in cancer patients receiving cytotoxic chemotherapy.
abstract: OBJECTIVE
  Few studies have examined the influence of diet on survival and chemotherapy-associated toxicities in patients with cancer. Although several comprehensive dietary questionnaires have been validated and calibrated in healthy populations, similar studies have not been performed among cancer patients.
  
  
  METHODS
  Two hundred patients with colorectal, breast, or neuroendocrine cancer undergoing treatment with cytotoxic chemotherapy completed a self-administered, 131-item, semiquantitative food frequency questionnaire. Using the questionnaire, we calculated dietary intakes of carotenoids, tocopherols, and fatty acids, and correlated these values with relevant biomarkers measured in simultaneously collected plasma specimens.
  
  
  RESULTS
  The Pearson correlation coefficients for various carotenoids as measured by the questionnaire, with the corresponding measurements in plasma specimens, ranged from 0.33 to 0.44 (all P < .001), adjusted for total energy intake, body mass index, age, sex, smoking status, and total plasma cholesterol. Similarly, the adjusted correlation between self-reported total vitamin E intake and plasma alpha-tocopherol was 0.34 (P < .001). Correlations between questionnaire and plasma measurements of trans-fat, eicosapentaenoic acid, and docosahexaenoic acid were 0.55, 0.29, and 0.42 (all P < .001), respectively. These levels of correlation are consistent with those reported in similar studies of self-reported diet in otherwise healthy populations.
  
  
  CONCLUSIONS
  Among patients with cancer receiving cytotoxic chemotherapy, questionnaire-based measurements of various micronutrients and dietary factors appeared to predict meaningful differences in the corresponding measurements in plasma specimens. This dietary questionnaire could offer an informative and practical means for assessing the influence of diet in cancer patients receiving chemotherapy.
authors.affiliation: Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA 02115, USA. jmeyerhardt@partners.org
authors.forename: Jeffrey A
authors.initials: JA
authors.lastname: Meyerhardt
authors.forename: Denise
authors.initials: D
authors.lastname: Heseltine
authors.forename: Hannia
authors.initials: H
authors.lastname: Campos
authors.forename: Michelle D
authors.initials: MD
authors.lastname: Holmes
authors.forename: Walter C
authors.initials: WC
authors.lastname: Willett
authors.forename: Eric P
authors.initials: EP
authors.lastname: Winer
authors.forename: Peter C
authors.initials: PC
authors.lastname: Enzinger
authors.forename: Craig A
authors.initials: CA
authors.lastname: Bunnell
authors.forename: Matthew H
authors.initials: MH
authors.lastname: Kulke
authors.forename: Charles S
authors.initials: CS
authors.lastname: Fuchs
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000970:Antineoplastic Agents / Q000627:therapeutic use*; D015415:Biomarkers; D001943:Breast Neoplasms / Q000188:drug therapy*; D002338:Carotenoids / Q000097:blood; D015179:Colorectal Neoplasms / Q000188:drug therapy*; D005227:Fatty Acids / Q000097:blood; D005247:Feeding Behavior; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D018358:Neuroendocrine Tumors / Q000188:drug therapy*; D015596:Nutrition Assessment; D009749:Nutrition Surveys; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D024505:Tocopherols / Q000097:blood
chemical_list: D000970:Antineoplastic Agents; D015415:Biomarkers; D005227:Fatty Acids; D002338:Carotenoids; D024505:Tocopherols