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1Department of Cancer Biomedical Science, National Cancer Center Graduate School of Cancer Science and Policy, Goyang, Korea
2Center for Colorectal Cancer, National Cancer Center, Goyang, Korea
3Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea
4Cancer Research Institute, Seoul National University, Seoul, Korea
5Department of Cancer, AI & Digital Health, National Cancer Center Graduate School of Cancer Science and Policy, Goyang, Korea
© 2023, Korean Society of Epidemiology
This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Characteristics | Cases (n=975) | Controls (n=975) | p-value |
---|---|---|---|
Age (yr) | 56.3±8.9 | 57.2±8.8 | 0.015 |
Sex | >0.999 | ||
Male | 605 (62.1) | 605 (62.1) | |
Female | 370 (38.0) | 370 (38.0) | |
Education | <0.001 | ||
Less than high school | 300 (30.8) | 123 (12.6) | |
High school graduate or associate’s degree | 411 (42.2) | 415 (42.6) | |
College graduate or more | 264 (27.1) | 437 (44.8) | |
Smoking | 0.368 | ||
Current | 481 (49.3) | 457 (46.9) | |
Past | 344 (35.3) | 347 (35.6) | |
Never | 150 (15.4) | 171 (17.5) | |
Drinking | |||
Current | 370 (38.0) | 295 (30.3) | <0.001 |
Past | 146 (15.0) | 94 (9.6) | |
Never | 459 (47.1) | 586 (60.1) | |
Obesity (BMI>25 kg/m2) | 352 (36.1) | 339 (34.8) | 0.538 |
First-degree family history of colorectal cancer | 91 (9.3) | 62 (6.4) | 0.015 |
Total energy intake (kcal/day) | 1,938.0±558.7 | 1,648.0±564.1 | <0.001 |
Vitamin E intake (mg/day) | 9.6±4.1 | 8.6±4.1 | <0.001 |
Vitamin E density (mg/1,000 kcal) | 4.9±1.3 | 5.2±1.5 | <0.001 |
Korean Healthy Eating Index | 58.1±9.2 | 58.8±10.8 | 0.150 |
rs740603 genotype | 0.998 | ||
A/A | 336 (34.5) | 336 (34.5) | |
A/G | 483 (49.5) | 482 (49.4) | |
G/G | 156 (16.0) | 157 (16.1) |
Vitamin E density (mg/1,000 kcal) | No. of cases/controls | Model 1 |
Model 2 |
---|---|---|---|
Q1 (≤4.16) | 308/243 | 1.00 (reference) | 1.00 (reference) |
Q2 (>4.16 and ≤5.03) | 279/244 | 0.78 (0.61, 0.999) | 0.84 (0.64, 1.09) |
Q3 (>5.03 and ≤5.93) | 176/244 | 0.47 (0.36, 0.62) | 0.55 (0.41, 0.73) |
Q4 (>5.93) | 212/244 | 0.60 (0.46, 0.78) | 0.72 (0.55, 0.96) |
p-for-linear trend | <0.001 | 0.002 |
COMT SNP rs740603 |
No. of cases/controls | Model 1 |
Model 2 |
---|---|---|---|
G/G | 156/157 | 1.00 (reference) | 1.00 (reference) |
A/A+A/G | 819/818 | 1.07 (0.84, 1.38) | 1.08 (0.83, 1.41) |
COMT SNP rs740603 |
Lower vitamin E |
Higher vitamin E |
p-value |
---|---|---|---|
G/G | |||
No. of cases/controls | 89/89 | 67/68 | |
Model 1 |
1.00 (reference) | 0.88 (0.54, 1.43) | 0.611 |
Model 2 |
1.00 (reference) | 1.13 (0.66, 1.91) | 0.662 |
A/A+A/G | |||
No. of cases/controls | 498/398 | 321/420 | |
Model 1 |
1.00 (reference) | 0.56 (0.46, 0.69) | <0.001 |
Model 2 |
1.00 (reference) | 0.63 (0.51, 0.78) | <0.001 |
Values are presented as means±standard deviation or number (%). BMI, body mass index. Differences between cases and controls were tested using the chi-square test for categorical variables and the t-test for continuous variables.
Values are presented as odds ratio (95% confidence interval). Adjusted for age, sex, total energy intake and first-degree family history of colorectal cancer. Adjusted for age, sex, total energy intake, first-degree family history of colorectal cancer, smoking, drinking, education, and obesity.
Values are presented as odds ratio (95% confidence interval). CRC, colorectal cancer; COMT, catechol-O-methyltransferase; SNP, single-nucleotide polymorphism. Dominant model. Adjusted for age, sex, total energy intake and first-degree family history of CRC. Adjusted for age, sex, total energy intake, first-degree family history of CRC, smoking, drinking, education, and obesity.
Values are presented as odds ratio (95% confidence interval). CRC, colorectal cancer; COMT, catechol-O-methyltransferase; SNP, single-nucleotide polymorphism. Dominant model. Lower and higher vitamin E groups had vitamin E density at or below and above the median (5.03 mg/1,000 kcal), respectively. Adjusted for age, sex, total energy intake and first-degree family history of CRC; p-for-interaction=0.060. Adjusted for age, sex, total energy intake, first-degree family history of CRC, smoking, drinking, education, and obesity; p-for-interaction=0.020.