Dietary pattern and oral cancer risk--a factor analysis study.
OBJECTIVE
The role of diet in cancer risk has mainly been investigated based on intake of individual food items. However, food consumption is made up of a combination of various food items. This study aims to determine the association of dietary patterns with oral cancer risk.


METHODS
A total of 306 matched cases and controls were recruited in this study. Data on dietary intake were obtained using food frequency questionnaire (FFQ). Factor analysis (FA) was performed to identify dietary patterns based on the intake of nine major food groups, resulting in four factors/components being retained. The odds ratio (OR) was computed for each component using conditional logistic regression.


RESULTS
The first pattern labelled as 'modern' was loaded with processed foods and snacks, whereas the second pattern termed as 'prudent' was characterized by intake of fruits and vegetables. The third pattern labelled as 'traditional' consisted of beverages and starches, while the fourth pattern termed as 'combination' was loaded with intakes of dairy, fermented/salted and meat/by-products. A significant reduced risk was found for 'prudent' (OR 0.53, 95% CI = 0.28-0.98), whereas an increased risk was found for both 'combination' (OR 2.43, 95% CI = 1.33-4.45) and 'traditional' (OR 2.32, 95% CI = 1.23-4.25) patterns. However, after adjusting for risk habits of tobacco smoking, alcohol consumption and betel quid chewing, only 'combination' (aOR 2.99, 95% CI = 1.55-5.75) and 'traditional' (aOR 2.08, 95% CI = 1.09-3.97) patterns remained significant.


CONCLUSIONS
Consumption in the highest tertile of 'traditional' and 'combination' patterns may induce twice and thrice the risk of oral cancer, respectively.
Oral Cancer Research & Coordinating Centre, University of Malaya, Kuala Lumpur, Malaysia.
Lee Ching
LC
Helen-Ng
Ishak A
IA
Razak
Wan Maria Nabillah
WM
Ghani
Jamaluddin
J
Marhazlinda
Abdul Talib
AT
Norain
Raja-Latifah
RL
Raja Jallaludin
Zainal Ariff Abdul
ZA
Rahman
Norlida
N
Abdullah
Rosnah B
RB
Zain
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000428:Alcohol Drinking / Q000009:adverse effects; D001114:Areca / Q000009:adverse effects; D016022:Case-Control Studies; D004032:Diet / Q000009:adverse effects* / Q000706:statistics & numerical data; D004034:Diet Surveys; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D016015:Logistic Models; D008296:Malaysia / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000209:etiology*; D016017:Odds Ratio; D012307:Risk Factors; D012907:Smoking / Q000009:adverse effects; D055815:Young Adult