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Cancer, Vegetarianism, and Diet

Last updated: September 2015

This article will address the subject of cancer rates in vegetarians. Very little data exists for vegans. The tables in this article are extracted from all studies that have looked at vegetarians and show the rates of cancer mortality (how many people died from the disease) or incidence (how many people contracted the disease).

Contents

Cancer Risk of Vegetarians

Each table below looks at a different type of cancer and whether there has been a difference in risk between vegetarians and non-vegetarians.

Some things to keep in mind:

In the tables, statistically significant findings are in red type. In order for the rate to be statistically significant, the numbers in the confidence interval (in the parentheses) must both either be less than 1.00 or greater than 1.00. If you are not familiar with statistics, click here for a quick explanation of disease rate statistics.

EPIC-Oxford: Cancer Mortality (2015)

In the 2015 paper from EPIC-Oxford (19), there was no difference in all cancer mortality between vegetarians (including vegans) and regular meat-eaters (0.93, 0.82-1.05). Vegetarians had lower rates of death from pancreatic (0.48, 0.28-0.82) and lymphatic (0.50, 0.32-0.79), but not colorectal, lung, breast, or ovary cancers.

After excluding participants who changed diet categories during the study, vegetarians had a lower risk of all cancer (0.82, 0.72-0.94), and similar findings as above for the other cancers.

Vegans suffered from 67 deaths from cancer, with a rate not significantly different from regular meat-eaters (1.14, 0.88-1.47).

General Cancer

Note: We are moving away from the table format below as it's becoming too unwieldy.

Table 1 show that the 2014 study from EPIC-Oxford is the first to show vegetarians to have a lower cancer rate than non-vegetarians (not including pesco-vegetarians). It took 14.9 years of follow-up before a statistically significant difference developed.

Table 1. Risk for All Cancers Combined.
Study Years Risk and Confidence Interval Adjustments Notes
EPIC-Oxford161993-2010
Non-Veg1.00
Pesco-Veg  .88 (.80, .97)
Vegetarians  .88 (.82, .95)
smoking, alcohol, physical activity level, gender, study, recruitment methodIncidence
EPIC-Oxford13 1993-2005
Non-Veg1.00
Vegetarians  .93 (.71, 1.04)
age, gender, smokingIncidence
EPIC-Oxford3 1993-2002
Non-Veg1.00
Vegetarians1.11 (.82, 1.51)
age, gender, smokingMortality
Oxford Vegetarian2 1980-2000
Non-Veg1.00
Vegetarians1.06 (.85, 1.34)
age, gender, smoking; excluded first 5 years of follow-up Mortality
Health Food Shoppers2 1973-1997
Non-Veg1.00
Vegetarians1.18 (.99, 1.41)
age, gender, smoking; excluded first 5 years of follow-up Mortality
Heidelberg Vegetarian1 1978-1989
Non-Veg1.00
Vegetarians1.59 (.87, 2.94)
gender, duration of diet, BMI (smoking did not effect results) Mortality. Non-vegetarians ate meat "occasionally."

Table 2 shows that the most recent reports from both AHS-2 and EPIC-Oxford found a lower cancer rate in vegans compared to non-vegetarians.

Table 2. Risk For All Cancers Combined.
StudyYears Risk and Confidence Interval Adjustments Notes
EPIC-Oxford161993-2010
Non-Veg1.00
Pesco  .88 (.80, .97)
Lacto-ovo  .89 (.83, .96)
Vegan  .81 (.66, .98)
smoking, alcohol, physical activity level, gender, study, recruitment methodIncidence
Adventist Health Study-2152002-2006
Non-Veg1.00
Semi  .98 (.82, 1.17)
Pesco  .88 (.77, 1.01)
Lacto-ovo  .93 (.85, 1.02)
Vegan  .84 (.72, .99)
age, race, family history of cancer, education, smoking, alcohol, age at menarche, pregnancies, breastfeeding, oral contraceptives, hormone replacement therapy, and menopause status. Adjusting for physical activity did not change the results.Incidence
Adventist Health Study-2152002-2006
Non-Veg1.00
Semi  .98 (.83, 1.18)
Pesco  .89 (.77, 1.03)
Lacto-ovo  .95 (.86, 1.04)
Vegan  .86 (.73, 1.00)
Same as above, plus BMIIncidence
EPIC-Oxford 14 1993-2006
Non-Vega1.00
Vegetarians   .88 (.81, .96)
Pescob   .82 (.73, .93)
age, gender, smoking, alcohol, BMI, physical activity, parity, oral contraceptives, method of recruitment Incidence
EPIC-Oxford13 1993-2005
Non-Vega1.00
Vegetarians  .89 (.80, 1.00)
Pescob   .83 (.71,   .96)
age, gender, smokingIncidence
aExcluding those who ate no meat other than fish. | bAte no meat other than fish.

Specific Cancers

The tables below do not include the results of the 2014 EPIC-Oxford (16) or 2015 EPIC-Oxford (20) reports. These reports are starting to contain so many different analyses that maintaining these tables is becoming unwieldy; we are assessing whether to change the format to something much simpler.

Colorectal Cancer

Table 3 shows one study that found a higher risk of colorectal cancer for vegetarians and one study that found a lower risk.

Table 3. Risk For Colorectal Cancer.
StudyYears Risk and Confidence Interval AdjustmentsNotes
Netherlands Cohort Study181986-2006
Non-Veg1.00
Vegetarians  .78 (.51, 1.20)
age, genderIncidence
Netherlands Cohort Study181986-2006
Non-Veg1.00
Vegetarians  .89 (.58, 1.39)
age, gender, energy, smoking, alcohol, BMI, physical activity, education Incidence
EPIC-Oxford161993-2010
Non-Veg1.00
Pesco-Veg  .66 (.48, .92)
Vegetarians  1.03 (.84, 1.26)
smoking, alcohol, physical activity level, gender, study, recruitment methodIncidence
EPIC-Oxford13 1993-2005
Non-Veg1.00
Vegetarians1.49 (1.09, 2.03)
age, gender, smokingIncidence
Oxford Vegetarian2 1980-2000
Non-Veg1.00
Vegetarians1.42 (  .76, 2.67)
age, gender, smoking; excluded first 5 years of follow-up Mortality
Oxford Vegetarian6 1980-1999
Non-Veg1.00
Vegetarians  .85 (  .55, 1.32)
age, sex, alcohol, smoking Incidence
Meta-Analysis5 1999
Non-Veg1.00
Vegetarians  .99 (  .77, 1.27)
age, gender, smoking, and study Mortality
Health Food Shoppers2 1973-1997
Non-Veg1.00
Vegetarians  .85 (  .52, 1.39)
age, gender, smoking; excluded first 5 years of follow-up Mortality
Adventist Health4 1976-1982
Non-Veg1.00
Vegetarians  .53 (  .35, .81)
age, gender Incidence

Table 4 divides populations into more specific diet groups:

Table 4. Risk For Colorectal Cancer.
StudyYears Risk and Confidence Interval AdjustmentsNotes
AHS-2172002-2014
Non-Veg1.00
Semi-Veg .92 (.62, 1.37)
Pesco .57 (.40, .82)
Lacto-ovo .82 (.65, 1.02)
Vegan .84 (.59-1.19)
age, race, gender, education, exercise, smoking, alcohol, family history, peptic ulcers, inflammatory bowel disease, diabetes mellitus, aspirin, statins, prior colonoscopy or flexible sigmoidoscopy, supplemental calcium, supplemental vitamin D, calories, hormone therapy Incidence
EPIC-Oxford 14 1993-2006
Non-Vega1.00
Vegetarians1.12 (.87, 1.44)
Pescob  .77 (.53, 1.13)
age, gender, smoking, alcohol, BMI, physical activity, parity, oral contraceptives, method of recruitment Incidence
EPIC-Oxford13 1993-2005
Non-Vega1.00
Vegetarians1.39 (1.01, 1.91)
Pescob  .64 (   .37, 1.10)
age, gender, smokingIncidence
aExcluding those who ate no meat other than fish. | bAte no meat other than fish.

Prostate Cancer

The results for prostate cancer, Table 5 below, are similar to colorectal; only the Adventist Health Study showed a statistically significant difference.

Table 5. Risk For Prostate Cancer.
StudyYears Risk and Confidence Interval AdjustmentsNotes
EPIC-Oxford13 1993-2005
Non-Veg1.00
Vegetarians  .90 (.61, 1.33)
age, gender, smokingIncidence
Oxford Vegetarian2 1980-2000
Non-Veg1.00
Vegetarians  .66 (.27, 1.59)
age, gender, smoking; excluded first 5 years of follow-up Mortality
Meta-Analysis5 1999
Non-Veg1.00
Vegetarians  .91 (.60, 1.39)
age, gender, smoking, and study Mortality
Health Food Shoppers2 1973-1997
Non-Veg1.00
Vegetarians1.29 (.62, 2.68)
age, gender, smoking; excluded first 5 years of follow-up Mortality
Adventist Health4 1976-1982
Non-Veg1.00
Vegetarians  .65 (.44,  .95)
age, gender Incidence. 6 years of follow up.

In AHS-2, vegans had a lower risk than regular meat-eaters, even after adjusting for BMI. In EPIC-Oxford, fish-eaters had a statistically significant, lower rate of prostate cancer than regular meat eaters. See Table 6 below.

Table 6. Risk For Prostate Cancer.
StudyYears Risk and Confidence Interval AdjustmentsNotes
AHS-219 2002-2013
Non-Vega1.00
Semi-Vegc 1.18 (.91, 1.54)
Pescob 1.07 (.88, 1.31)
Lacto-Ovo   .96 (.83, 1.12)
Vegan   .66 (.50,   .87)
Age, race, family history, education, screening, caloric intake, BMI Incidence
EPIC-Oxford14 1993-2006
Non-Vega1.00
Vegetarians   .87 (.64, 1.18)
Pescob   .57 (.33,   .99)
age, gender, smoking, alcohol, BMI, physical activity, parity, oral contraceptives, method of recruitment Incidence
aExcluding those who ate no meat other than fish. | bAte no meat other than fish. | cAte red meat or poultry ≤1 time/month but all meats combined (including fish) <1 time/wk.

Breast Cancer

Unfortunately, the one (barely) significant finding was that vegetarians had more breast cancer in the Health Food Shoppers study. See Table 7 below. That study did not adjust for having children which is protective against breast cancer, and vegetarian women tend to have fewer children.

Table 7. Risk For Breast Cancer.
StudyYears Risk and Confidence Interval AdjustmentsNotes
AHS-2212002-2011
Non-Veg1.00
Semi  .91 (.67, 1.23)
Pesco  .91 (.71, 1.17)
Lacto-ovo  1.05 (.89, 1.23)
Vegan  .78 (.58, 1.05)
All Veg  .97 (.84, 1.11)
race, height, physical activity, family history of cancer, mammography, age at menopause, age at menarche, birth control pills, hormone replacement therapy, age at first child, number of children, breastfeeding, educational level, smoking, alcoholIncidence
EPIC-Oxford13 1993-2005
Non-Veg1.00
Vegetarians  .94 (.77, 1.13)
age, gender, smokingIncidence
Oxford Vegetarian2 1980-2000
Non-Veg1.00
Vegetarians1.23 (.66, 2.31)
age, smoking; excluded first 5 years of follow-up Mortality
Meta-Analysis5 1999
Non-Veg1.00
Vegetarians  .95 (.55, 1.63)
age, smoking, and study Mortality
South Asian-Born Women Living in UK8 1995-1999
Non-Veg1.00
Vegetarians  .77 (.50, 1.19)
age, smoking; excluded first 5 years of follow-up Incidence. Case control.
Health Food Shoppers2 1973-1997
Non-Veg1.00
Vegetarians1.62 (1.01, 2.60)
age, smoking; excluded first 5 years of follow-up Mortality
India7 1980-1984
Non-Veg1.00
Vegetarians1.25 (.48, 1.67)
age, region Incidence. Case control.
Adventist Health4 1976-1982
Non-Veg1.00
Vegetarians  .80 (.56, 1.15)
age Incidence. 6 years of follow up.
Table 8. Rates for Breast Cancer.
StudyYears Risk and Confidence Interval AdjustmentsNotes
EPIC-Oxford 14 1993-2006
Non-Vega1.00
Vegetarians   .91 (.77, 1.08)
Pescob1.05 (.86, 1.28)
age, gender, smoking, alcohol, BMI, physical activity, parity, oral contraceptives, method of recruitment Incidence
aExcluding those who ate no meat other than fish. | bAte no meat other than fish.

Lung Cancer

Table 9. Rates for Lung Cancer.
StudyYears Risk and Confidence Interval AdjustmentsNotes
EPIC-Oxford13 1993-2005
Non-Veg1.00
Vegetarians1.23 (.69, 2.17)
age, gender, smokingIncidence
Oxford Vegetarian2 1980-2000
Non-Veg1.00
Vegetarians1.27 (.60, 2.68)
age, gender, smoking; excluded first 5 years of follow-up Mortality
Meta-Analysis5 1999
Non-Veg1.00
Vegetarians  .84 (.59, 1.18)
age, gender, smoking, and study Mortality
Health Food Shoppers2 1973-1997
Non-Veg1.00
Vegetarians1.19 (.70, 2.02)
age, gender, smoking; excluded first 5 years of follow-up Mortality
Adventist Health4 1976-1982
Non-Veg1.00
Vegetarians  .86 (.42, 1.79)
age, gender Incidence. 6 years of follow up.
Table 10. Rates for Lung Cancer.
StudyYears Risk and Confidence Interval AdjustmentsNotes
EPIC-Oxford 14 1993-2006
Non-Vega1.00
Vegetarians1.11 (.75, 1.65)
Pescob  .59 (.29, 1.23)
age, gender, smoking, alcohol, BMI, physical activity, parity, oral contraceptives, method of recruitment Incidence
aExcluding those who ate no meat other than fish. | bAte no meat other than fish.

Ovarian Cancer

Table 11. Rates for Ovarian Cancer.
StudyYears Risk and Confidence Interval AdjustmentsNotes
EPIC-Oxford13 1993-2005
Non-Veg1.00
Vegetarians  .85 (.49, 1.46)
age, gender, smokingIncidence
Table 12. Rates for Ovarian Cancer.
StudyYears Risk and Confidence Interval AdjustmentsNotes
EPIC-Oxford 14 1993-2006
Non-Vega1.00
Vegetarians  .69 (.45, 1.07)
Pescob  .37 (.18,   .77)
age, gender, smoking, alcohol, BMI, physical activity, parity, oral contraceptives, method of recruitment Incidence
aExcluding those who ate no meat other than fish. | bAte no meat other than fish.

Uterine Cancer

Table 13. Rates for Uterine Cancer.
StudyYears Risk and Confidence Interval AdjustmentsNotes
Adventist Health4 1976-1982
Non-Veg1.00
Vegetarians  .85 (.58, 1.23)
age, gender Incidence. 6 years of follow up.

Stomach Cancer

Table 14. Risk for Stomach Cancer.
StudyYears Risk and Confidence Interval AdjustmentsNotes
Meta-Analysis5 1999
Non-Veg1.00
Vegetarians1.02 (.64, 1.62)
age, gender, smoking, and study Mortality
Table 15. Risk for Stomach Cancer.
StudyYears Risk and Confidence Interval AdjustmentsNotes
EPIC-Oxford 14 1993-2006
Non-Vega1.00
Vegetarians  .36 (.16,   .78)
Pescob  .29 (.07, 1.20)
age, gender, smoking, alcohol, BMI, physical activity, parity, oral contraceptives, method of recruitment Incidence
aExcluding those who ate no meat other than fish. | bAte no meat other than fish.

Pancreatic Cancer

Table 16 shows that vegetarians had about half the rate of pancreatic cancer compared to people who ate meat more than once daily. In comparison to all meat eaters, the rates were not significantly different.

Table 16. Risk for Pancreatic Cancer.
StudyYears Risk and Confidence Interval AdjustmentsNotes
Adventist Health10 1976-1982
Non-Veg1.00
Vegetarians  .46 (  .06, 1.39)
 
Vegetarians1.00
Non-Vega2.18 (1.04, 4.58)
age, sex, smoking, other foods

age, gender
Mortality
aAte meat more than once daily.
Table 17. Risk for Pancreatic Cancer.
StudyYears Risk and Confidence Interval AdjustmentsNotes
EPIC-Oxford 14 1993-2006
Non-Vega1.00
Vegetarians  .94 (.52, 1.71)
Pescob  .82 (.34, 1.96)
age, gender, smoking, alcohol, BMI, physical activity, parity, oral contraceptives, method of recruitment Incidence
aExcluding those who ate no meat other than fish. | bAte no meat other than fish.

Brain Cancer

Among people who ate meat more than once daily, there were no cases of meningioma cancer and this finding was statistically significant (see Table 18 below.)

Table 18. Risk for Brain Cancer.
StudyYears Risk and Confidence Interval AdjustmentsNotes
Adventist Health11 1976-1982
Glioma Cancer
Vegetarians1.00
Non-Vega1.56 (.52, 5.63)
Non-Vegb1.75 (.34, 8.54)
 
Meningioma Cancer
Vegetarians1.00
Non-Vega  .36 (.09, 1.46)
Non-Vegb0 (P < .05)
age, gender Incidence. 6 years of follow up.
aAte meat less than once daily.| bAte meat more than once daily.
Table 19. Risk for Brain Cancer.
StudyYears Risk and Confidence Interval AdjustmentsNotes
EPIC-Oxford 14 1993-2006
Non-Vega1.00
Vegetarians 1.25 (.72, 2.16)
Pescob 1.39 (.69, 2.80)
age, gender, smoking, alcohol, BMI, physical activity, parity, oral contraceptives, method of recruitment Incidence
aExcluding those who ate no meat other than fish. | bAte no meat other than fish.

Oral Cancer

Vegetarians, as shown in Table 20 below, had significantly lower rates of oral cancer in this study of Indian vegetarians.

Table 20. Risk for Oral Cancer.
StudyYears Risk and Confidence Interval AdjustmentsNotes
India9 1980-1984
Non-Veg1.00
Vegetarians  .55 (.40, .74)
age, region Incidence. Case control.

Cancer of the Upper Digestive Tract

Table 21. Risk for Cancer of the Upper Digestive Tract.
StudyYears Risk and Confidence Interval AdjustmentsNotes
EPIC-Oxford141993-2006
Non-Vega1.00
Vegetarians  .81 (.45, 1.46)
Pescob  .44 (.16, 1.25)
age, gender, smoking, alcohol, BMI, physical activity, parity, oral contraceptives, method of recruitment Incidence
aExcluding those who ate no meat other than fish. | bAte no meat other than fish.

Cervical Cancer

Table 22. Risk for Cervical Cancer.
StudyYears Risk and Confidence Interval AdjustmentsNotes
EPIC-Oxford141993-2006
Non-Vega1.00
Vegetarians 2.08 (1.05, 4.12)
Pescob2.05 (  .91, 4.63)
age, gender, smoking, alcohol, BMI, physical activity, parity, oral contraceptives, method of recruitment Incidence
aExcluding those who ate no meat other than fish. | bAte no meat other than fish.

Melanoma

Table 23. Risk for Melanoma.
StudyYears Risk and Confidence Interval AdjustmentsNotes
EPIC-Oxford141993-2006
Non-Vega1.00
Vegetarians  .89 (.61, 1.29)
Pescob  .90 (.55, 1.47)
age, gender, smoking, alcohol, BMI, physical activity, parity, oral contraceptives, method of recruitment Incidence
aExcluding those who ate no meat other than fish. | bAte no meat other than fish.

Endometrial Cancer

Table 24. Risk for Endometrial Cancer.
StudyYears Risk and Confidence Interval AdjustmentsNotes
EPIC-Oxford141993-2006
Non-Vega1.00
Vegetarians  .75 (.45, 1.28)
Pescob  .61 (.29, 1.30)
age, gender, smoking, alcohol, BMI, physical activity, parity, oral contraceptives, method of recruitment Incidence
aExcluding those who ate no meat other than fish. | bAte no meat other than fish.

Kidney Cancer

Table 25. Risk for Kidney Cancer.
StudyYears Risk and Confidence Interval AdjustmentsNotes
EPIC-Oxford141993-2006
Non-Vega1.00
Vegetarians  .76 (.36, 1.58)
Pescob  .36 (.09, 1.52)
age, gender, smoking, alcohol, BMI, physical activity, parity, oral contraceptives, method of recruitment Incidence
aExcluding those who ate no meat other than fish. | bAte no meat other than fish.

Bladder Cancer

Table 26. Risk for Bladder Cancer.
StudyYears Risk and Confidence Interval AdjustmentsNotes
EPIC-Oxford141993-2006
Non-Vega1.00
Vegetarians  .47 (.25,   .89)
Pescob  .81 (.36, 1.81)
age, gender, smoking, alcohol, BMI, physical activity, parity, oral contraceptives, method of recruitment Incidence
aExcluding those who ate no meat other than fish. | bAte no meat other than fish.

Lymphatic & Hematopoietic Tissue Cancer

Table 27. Risk for Lymphatic & Hematopoietic Tissue Cancer.
StudyYears Risk and Confidence Interval AdjustmentsNotes
EPIC-Oxford14 1993-2006
All
Non-Vega1.00
Vegetarians  .55 (.39,  .78)
Pescob  .85 (.56, 1.29)
 
Non-Hodgkin's Lymphoma
Non-Vega1.00
Vegetarians  .57 (.35,   .95)
Pescob  .86 (.47, 1.58)
 
Multiple Myeloma
Non-Vega1.00
Vegetarians  .25 (.08,  .73)
Pescob  .72 (.25, 2.10)
 
Leukemia
Non-Vega1.00
Vegetarians  .78 (.43, 1.43)
Pescob 1.18 (.58, 2.40)
age, gender, smoking, alcohol, BMI, physical activity, parity, oral contraceptives, method of recruitmentIncidence
aExcluding those who ate no meat other than fish. | bAte no meat other than fish.

Diet and Lifestyle Components and Cancer

In 2004, Diet, Nutrition and the Prevention of Cancer was published in the journal Public Health Nutrition. Two of the authors, Timothy Key and Naomi Allen, have been involved in many of the above studies. Walter Willett of the Harvard School of Public Health also co-authored this paper which reviews what is currently known about diet and cancer. They summarize their findings based on levels of evidence:

Convincing Evidence

Probable Evidence

Insufficient Evidence

The authors conclude:

"Since the 1981 Doll and Peto review on diet and cancer mortality (12), about one third of cancers have generally been thought to be related to dietary factors. More recent evidence suggests that this number may be too high, but a revised quantitative estimate is beyond the scope of this review. Among the diet-related factors, overweight/obesity convincingly increases the risks of several common cancers. After tobacco, overweight/obesity appears to be the most important avoidable cause of cancer in populations with Western patterns of cancer incidence. Among non-smoking individuals in these populations, avoidance of overweight is the most important strategy for cancer prevention."

References

Footnotes

1. Chang-Claude J, Frentzel-Beyme R. Dietary and lifestyle determinants of mortality among German vegetarians. Int J Epidemiol. 1993 Apr;22(2):228-36.

2. Appleby PN, Key TJ, Thorogood M, Burr ML, Mann J. Mortality in British vegetarians. Public Health Nutr. 2002 Feb;5(1):29-36.

3. Key TJ, Appleby PN, Davey GK, Allen NE, Spencer EA, Travis RC. Mortality in British vegetarians: review and preliminary results from EPIC-Oxford. Am J Clin Nutr. 2003 Sep;78(3 Suppl):533S-538S.

4. Fraser GE. Associations between diet and cancer, ischemic heart disease, and all-cause mortality in non-Hispanic white California Seventh-day Adventists. Am J Clin Nutr. 1999 Sep;70(3 Suppl):532S-538S.

5. Key TJ, Fraser GE, Thorogood M, Appleby PN, Beral V, Reeves G, Burr ML, Chang- Claude J, Frentzel-Beyme R, Kuzma JW, Mann J, McPherson K. Mortality in vegetarians and nonvegetarians: detailed findings from a collaborative analysis of 5 prospective studies. Am J Clin Nutr. 1999 Sep;70(3 Suppl):516S-524S.

6. Sanjoaquin MA, Appleby PN, Thorogood M, Mann JI, Key TJ. Nutrition, lifestyle and colorectal cancer incidence: a prospective investigation of 10998 vegetarians and nonvegetarians in the United Kingdom. Br J Cancer. 2004 Jan 12;90(1):118-21.

7. Rao DN, Ganesh B, Desai PB. Role of reproductive factors in breast cancer in a low -risk area: a case-control study. Br J Cancer. 1994 Jul;70(1):129-32.

8. Dos Santos Silva I, Mangtani P, McCormack V, Bhakta D, Sevak L, McMichael AJ. Lifelong vegetarianism and risk of breast cancer: a population-based case-control study among South Asian migrant women living in England. Int J Cancer. 2002 May 10;99(2):238-44.

9. Rao DN, Ganesh B, Rao RS, Desai PB. Risk assessment of tobacco, alcohol and diet in oral cancer--a case-control study. Int J Cancer. 1994 Aug 15;58(4):469-73.

10. Mills PK, Beeson WL, Abbey DE, Fraser GE, Phillips RL. Dietary habits and past medical history as related to fatal pancreas cancer risk among Adventists. Cancer. 1988 Jun 15;61(12):2578-85.

11. Mills PK, Preston-Martin S, Annegers JF, Beeson WL, Phillips RL, Fraser GE. Risk factors for tumors of the brain and cranial meninges in Seventh-Day Adventists. Neuroepidemiology. 1989;8(5):266-75.

12. Doll R, Peto R. The causes of cancer: quantitative estimates of avoidable risks of cancer in the United States today. Journal of the National Cancer Institute 1981;66:1191-308.

13. Key TJ, Appleby PN, Spencer EA, Travis RC, Roddam AW, Allen NE. Cancer incidence in vegetarians: results from the European Prospective Investigation into Cancer and Nutrition (EPIC-Oxford). Am J Clin Nutr 2009;89(suppl):1S-7S

14. Key TJ, Appleby PN, Spencer EA, Travis RC, Allen NE, Thorogood M, Mann JI. Cancer incidence in British vegetarians. Br J Cancer. 2009 Jul 7;101(1):192-7. Epub 2009 Jun 16.

15. Tantamango-Bartley Y, Jaceldo-Siegl K, Fan J, Fraser G. Vegetarian diets and the incidence of cancer in a low-risk population. Cancer Epidemiol Biomarkers Prev. 2012 Nov 20. | link

16. Key TJ, Appleby PN, Crowe FL, Bradbury KE, Schmidt JA, Travis RC. Cancer in British vegetarians: updated analyses of 4998 incident cancers in a cohort of 32,491 meat eaters, 8612 fish eaters, 18,298 vegetarians, and 2246 vegans. Am J Clin Nutr. 2014 Jun 4. | link

17. Orlich MJ, Singh PN, Sabaté J, Fan J, Sveen L, Bennett H, Knutsen SF, Beeson WL, Jaceldo-Siegl K, Butler TL, Herring RP, Fraser GE. Vegetarian Dietary Patterns and the Risk of Colorectal Cancers. JAMA Intern Med. 2015 Mar 9. [Epub ahead of print] | link

18. Gilsing AM, Schouten LJ, Goldbohm RA, Dagnelie PC, van den Brandt PA, Weijenberg MP. Vegetarianism, low meat consumption and the risk of colorectal cancer in a population based cohort study. Sci Rep. 2015 Aug 28;5:13484. | link

19. Tantamango-Bartley Y, Knutsen SF, Knutsen R, Jacobsen BK, Fan J, Beeson WL, Sabate J, Hadley D, Jaceldo-Siegl K, Penniecook J, Herring P, Butler T, Bennett H, Fraser G. Are strict vegetarians protected against prostate cancer? Am J Clin Nutr. 2015 Nov 11. | link

20. Appleby PN, Crowe FL, Bradbury KE, Travis RC, Key TJ. Mortality in vegetarians and comparable nonvegetarians in the United Kingdom. Am J Clin Nutr. 2016 Jan;103(1):218-30. | link

21. Penniecook-Sawyers JA, Jaceldo-Siegl K, Fan J, Beeson L, Knutsen S, Herring P, Fraser GE. Vegetarian dietary patterns and the risk of breast cancer in a low-risk population. Br J Nutr. 2016 Mar 18:1-8. | link

Other Papers Reviewed in Preparing this Report

American Dietetic Association; Dietitians of Canada. Position of the American Dietetic Association and Dietitians of Canada: Vegetarian diets. J Am Diet Assoc. 2003 Jun;103(6):748-65.

Chang CC, Yu MW, Lu CF, Yang CS, Chen CJ. A nested case-control study on association between hepatitis C virus antibodies and primary liver cancer in a cohort of 9,775 men in Taiwan. J Med Virol. 1994 Jul;43(3):276-80.

Frentzel-Beyme R, Claude J, Eilber U. Mortality among German vegetarians: first results after five years of follow-up. Nutr Cancer. 1988;11(2):117-26.

Key TJ, Schatzkin A, Willett WC, Allen NE, Spencer EA, Travis RC. Diet, nutrition and the prevention of cancer. Public Health Nutr. 2004 Feb;7(1A):187-200.

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"Vegetarian" / "no meat" categories did not exclude fish.

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Basically same results as reference 13 Key at al. Am J Clin Nutr 2009;89(suppl):1S-7S.