Coffee and tea consumption and cancers of the bladder, colon and rectum

Woolcott, Christy; King, WD; Marrett, Loraine D.

doi:10.1097/00008469-200204000-00005

Cited by 54 publications

(37 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Figure 1 shows flowchart of study section. Of initially 72 studies searched, 13 studies including a total of 12,636 cases and 38,419 controls were identified (Kato et al, 1990;Baron et al, 1994;Ji et al, 1997;Tavani et al, 1997;Inoue et al, 1998;Munoz et al, 1998;Slattery et al, 1999;Woolcott et al, 2002;Zhang et al, 2002;Il'yasova et al, 2003;Li et al, 2011;Wu et al, 2011;. Table 1 summarized the detailed characteristics of included studies.…”

Section: Discussionmentioning

confidence: 99%

“…All of included 13 studies were published in English, the cases were histological, pathologically or cytological confirmed as CRC. Controls were mainly healthy populations, and matched with age and gender, 4 were hospital-based (HB) (Tavani et al, 1997;Inoue et al, 1998;Munoz et al, 1998;Zhang et al, 2002), 9 were population-based (PB) (Kato et al, 1990;Baron et al, 1994;Ji et al, 1997;Slattery et al, 1999;Woolcott et al, 2002;Il'yasova et al, 2003;Li et al, 2011;Wu et al, 2011;. There were 5 studies performed in China (Ji et al, 1997;Zhang et al, 2002;Li et al, 2011;Wu et al, 2011;, two in Japan (Kato et al, 1990;Inoue et al, 1998), two in the USA (Slattery et al, 1999;Il'yasova et al, 2003), one in Sweden (Baron et al, 1994), one in Italy (Tavani et al, 1997), one in Argentina (Munoz et al, 1998), and one in Canada (Woolcott et al, 2002).…”

Section: Discussionmentioning

confidence: 99%

“…Compared with the previous meta-analysis published in 2006 by Sun et al (Sun et al, 2006), our meta-analysis included 6 eligible case-control studies before 2006 (Baron et al, 1994;Tavani et al, 1997;Munoz et al, 1998;Slattery et al, 1999;Woolcott et al, 2002;Il'yasova et al, 2003) and 3 after 2006 Wu et al, 2011;. In addition, their results showed that high green tea consumption had a statistically significant reduction risk of CRC in overall result (OR=0.74, 95%CI= 0.63-0.86) and in conlon cancer (OR=0.74, 95%CI= 0.60-0.93), but not consistent in rectal cancer (OR=0.98, 95%CI= 0.61-1.60).…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Association Between Green Tea and Colorectal Cancer Risk: A Meta-analysis of 13 Case-control Studies

Wang

Zeng²,

Duan³

et al. 2012

Asian Pacific Journal of Cancer Prevention

View full text Add to dashboard Cite

Objective: Experimental studies have suggested green tea to be a chemopreventive agent for colorectal cancer, and many studies have examined possible associations. However, the conclusions were inconsistent or even contradictory, so we performed a meta-analysis based on published case-control studies to explore if green tea is indeed a protective factor. Methods: PubMed was searched up to May 10 th , 2012 for relevant studies, and references of included studies were manually searched. Finally 13 eligible studies, involving 12,636 cases and 38,419 controls were identified. After data extraction, a meta-analysis was performed using CMA v2 software. Results: The results indicated there may be a weak but not statistically significant reduced risk of colorectal cancer with high dose of green tea intake (OR=0.95, 95% CI:0.81-1.11, p=0.490.69-0.98). This protective effect was also found in all subgroups, except in American and European populations. Sensitivity analysis indicated the result to be robust. Publication bias was not detected by either funnel plot or Egger tests. Conclusion: The results of this meta-analysis indicate a weak lower tendency for colorectal cancer development with green tea consumption, but available epidemiologic data are insufficient to conclude that green tea may protect against colorectal cancer in humans.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Association Between Green Tea and Colorectal Cancer Risk: A Meta-analysis of 13 Case-control Studies

Wang

Zeng²,

Duan³

et al. 2012

Asian Pacific Journal of Cancer Prevention

View full text Add to dashboard Cite

show abstract

“…Michels et al (36) reported separate RR from two large US cohorts in their study, the Nurses' Health Study (NHS) (36a) and the Health Professionals Follow-up Study (HPFS) (36b) ; we counted the report as two prospective studies. Finally, our meta-analysis included twenty-five case-control (11,15,20,26,(28)(29)(30)(31)(33)(34)(35)(38)(39)(40)(41)(42)(43)(44)(45)(46)(47)(48)(49)(50)(51) and sixteen cohort studies (17,19,21-25,27,32,36a,36b,37,52-55) .…”

Section: Inclusion Criteriamentioning

confidence: 99%

“…The items in the form included: first author's last name; year of publication; country of origin; years of study/ follow-up period; number of cases/controls; age at baseline; OR/RR and 95 % CI for the association between coffee consumption and colorectal cancer incidence, considering two exposure levels (highest v. lowest/non); type of controls; and control of confounding factors. If OR and/or 95 % CI were not reported, but numbers of cases and controls in highest v. lowest/non categories of coffee consumption were provided, these data were used to calculate crude OR and unadjusted CI (28,31,(33)(34)(35)39,40,42,46,48,49) .…”

Section: Data Extractionmentioning

confidence: 99%

Coffee consumption and risk of colorectal cancer: a meta-analysis of observational studies

Ma²,

Zhang³

et al. 2012

Public Health Nutr.

View full text Add to dashboard Cite

Objective: Separate meta-analyses based on case-control and cohort studies have reported different results on the relationship between coffee consumption and colorectal cancer risk. To clarify the effect of coffee intake on colorectal cancer risk, we performed a meta-analysis based on both case-control and cohort studies. Design: Review study. Setting: We identified case-control and cohort studies related to coffee consumption and colorectal cancer risk listed on MEDLINE, the Cochrane Controlled Trials Register, EMBASE, Science Citation Index and PubMed (until May 2011). In subgroup analyses using case-control studies, significant inverse associations were found in females for colorectal cancer and in Europe for colorectal and colon cancer, while the subgroup analyses of cohort studies found that coffee drinks substantially decreased risk of colon cancer only in Asian women. Conclusions: Results from case-control studies suggest coffee consumption can significantly decrease the risks of colorectal cancer and colon cancer, especially in Europe and for females. Keywords Colorectal cancer Coffee Meta-analysis Observational studiesColorectal cancer is the third most common cancer in men and the second most common in women worldwide, with over 1?2 million new cancer cases and 608 700 deaths occurring in 2008 (1) . It is well known that obesity, smoking and physical inactivity are important risk factors for colorectal cancer. However, nutritional factors such as alcohol, tea, coffee, etc. have also been considered to play an important role in the development of colorectal cancer (2) .Coffee is a complex mixture of more than a thousand chemicals, and these constituents have potential genotoxic and mutagenic properties, antioxidant and antimutagenic activities to affect colorectal cancer risk (3) . Over the last four decades, the relationship between coffee consumption and colorectal cancer risk has been extensively examined (4) . In 1990, a Working Group of the International Agency for Research on Cancer reviewed the data on coffee consumption and colorectal cancer risk and concluded that in man 'there is some evidence of an inverse relation between coffee drinking and cancer of the large bowel' (3) . However, the relationship between coffee intake and colorectal cancer risk appears inconsistent in case-control studies and cohort studies. To clarify the relationship between coffee consumption and colorectal cancer risk, Giovannucci performed a meta-analysis in 1998 and reported an overall OR/relative ratio (RR) for high v. low coffee intake of 0?72 (95 % CI 0?61, 0?84) and 0?97 (95 % CI 0?73, 1?29) after combining the results of twelve case-control studies and five cohort studies, respectively (5) . A subsequent meta-analysis (6) and a pooled analysis (7) for cohort studies showed no significant inverse associations; however, another meta-analysis in 2011 *Corresponding authors: Email

show abstract

Coffee consumption and the risk of colorectal cancer: A prospective cohort study in Japan

Naganuma

Kuriyama

Akhter

et al. 2007

Intl Journal of Cancer

View full text Add to dashboard Cite

An inverse association between coffee consumption and the risk of colorectal cancer has been reported in several case-control studies, but results from prospective cohort studies have been inconclusive. We conducted a prospective cohort study among a Japanese population to clarify the association between coffee consumption and the risk of colorectal cancer incidence. We used data from the Miyagi Cohort Study for this analysis. Usable self-administered questionnaires about coffee consumption were returned from 22,836 men and 24,769 women, aged 40-64 years, with no previous history of cancer. We used the Cox proportional-hazard regression model to estimate hazard ratios and 95% confidence intervals. During 11.6 years of follow-up (425,303 person-years), we identified 457 cases of colorectal cancer. Coffee consumption was not associated with the incidence of colorectal, colon or rectal cancer. The multivariate-adjusted hazard ratio (95% confidence interval) of colorectal cancer incidence for 3 or more cups of coffee per day as compared with no consumption was 0.95 (0.65-1.39) for men and women (p for trend 5 0.55), 0.91 (0.56-1.46) for men (p for trend 5 0.53) and 1.16 (0.60-2.23) for women (p for trend 5 0.996). Coffee consumption was also not associated with incidence of either proximal or distal colon cancer. We conclude that coffee consumption is not associated with the incidence risk of colorectal cancer in the general population in Japan. ' 2006 Wiley-Liss, Inc.Key words: coffee; colorectal cancer; incidence; Japan; prospective study Colorectal cancer is one of the most common cancers worldwide. 1,2 In Japan, colorectal cancer ranks second in terms of agestandardized incidence rate among all cancers, and it is increasing rapidly. 3 Therefore, primary prevention of colorectal cancer worldwide, including Japan, is a considerable public health concern.Coffee is considered to be a protective factor against colorectal cancer through activity of its anticarcinogenic constituents, cafestol and kahweol. 4 It may also decrease the risk of colorectal cancer by reducing the excretion of bile acids and neutral sterols into the colon. 5 Some epidemiological studies have examined the relationship between coffee consumption and the risk of colorectal cancer. 6 Sixteen out of 20 case-control studies supported an inverse association between high coffee consumption and colorectal cancer risk. [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] However, the results of those studies may have been affected by selection bias or recall bias due to retrospective assessment of coffee consumption and other lifestyles-related factors after diagnosis of cancer. In contrast, results from prospective cohort studies have been inconclusive. [27][28][29][30][31][32][33][34][35][36] Among 10 such studies, 1 suggested an increasing risk, 27 3 showed an inverse association 29,34,36 and the others observed no association. 28,[30][31][32][33]35 However, as the studies that observed any association had some statistical l...

show abstract

Coffee and tea consumption and cancers of the bladder, colon and rectum

Cited by 54 publications

References 49 publications

Association Between Green Tea and Colorectal Cancer Risk: A Meta-analysis of 13 Case-control Studies

Association Between Green Tea and Colorectal Cancer Risk: A Meta-analysis of 13 Case-control Studies

Coffee consumption and risk of colorectal cancer: a meta-analysis of observational studies

Coffee consumption and the risk of colorectal cancer: A prospective cohort study in Japan

Contact Info

Product

Resources

About