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PubMed1993

Effects of green tea catechins in a rat multi-organ carcinogenesis model.

The effects of dietary administration of green tea catechins (GTC) were examined using a multi-organ carcinogenesis model. Groups of 15 F344 male rats were initially treated with a single i.p. administration of 100 mg/kg body wt N-diethyl-nitrosamine, 4 i.p. administrations of 20 mg/kg body wt N-methylnitrosourea, 4 s.c. doses of 40 mg/kg body wt 1,2-dimethylhydrazine, together with 0.05% N-butyl-N-(4-hydroxybutyl)nitrosamine for 2 weeks and then 0.1% 2,2'-dihydroxy-di-n-propylnitrosamine for 2 weeks, both in the drinking water, for a total initiation period of 4 weeks. GTC in the diet, at doses of 1.0 or 0.1%, was administered from 1 day before and during carcinogen exposure, after carcinogen exposure or both during and after carcinogen exposure. Further groups of animals were treated with carcinogen, 1% GTC or basal diet alone as controls. All animals were killed at the end of week 36, and all major organs examined histopathologically. The numbers of small intestinal tumors (adenomas and carcinomas) per rat were significantly reduced in the groups treated with 1% GTC during (0.13 +/- 0.35) and after carcinogen exposure (0.31 +/- 0.48) and in those receiving 1% and 0.1% GTC both during and after carcinogen exposure (0.14 +/- 0.36, 0.46 +/- 0.97 respectively) as compared with the carcinogen alone group (1.07 +/- 1.21). On the other hand, numbers of glutathione S-transferase placental form positive liver foci per cm2 were slightly but significantly increased in the groups treated with 1 and 0.1% GTC during carcinogen exposure, 1% GTC after carcinogen exposure and 1% GTC both during and after carcinogen exposure. The results indicated that while GTC inhibits small intestinal carcinogenesis it slightly enhances hepatocarcinogenesis in a dose dependent manner when applied both during and after carcinogen exposure.

1,2-Dimethylhydrazine↗
PubMed1990

Comparison of coffee intake and coffee-induced symptoms in patients with duodenal ulcer, nonulcer dyspepsia, and normal controls.

Coffee and decaffeinated coffee stimulate acid secretion. In addition, many patients experience dyspepsia after coffee ingestion. Therefore, coffee is often prohibited by physicians in patients with peptic diseases. However, the association between peptic disease and symptoms remains unclear. This study compares coffee intake and the induction of symptoms by coffee in patients with duodenal ulcer disease, nonulcer dyspepsia, and normal controls. We have studied the coffee drinking habits of 58 duodenal ulcer patients, 55 nonulcer dyspepsia patients, and 55 normal controls. The use of coffee on a daily basis was not significantly different between duodenal ulcer patients (64%) and controls (56%), or between nonulcer dyspepsia patients (55%) and controls. There was also no difference between the three groups in the use of decaffeinated coffee, the number of cups per day, the method of preparation, the length of time of coffee use, or any change in coffee intake in the previous year. The intake of tea, caffeinated carbonated beverages, and aspirin or nonsteroidal anti-inflammatory drugs was also similar in the three groups. The duodenal ulcer patients were more likely to be cigarette smokers (45%) than either the controls (16%) or the nonulcer dyspepsia patients (24%). Daily alcohol intake was not significantly different in the three groups. The prevalence of coffee induction of dyspeptic symptoms was similar in duodenal ulcer patients (29%) and controls (22%), but was much more common in nonulcer dyspepsia patients (53%) than in controls (22%), p = 0.0036. In conclusion, there was no difference in coffee intake between patients with duodenal ulcer, nonulcer dyspepsia, or normal controls. However, patients with nonulcer dyspepsia, but not duodenal ulcer, were more likely to experience dyspeptic symptoms after coffee ingestion.

Caffeine↗
PubMed1987

Glucose and insulin responses to manufactured and whole-food snacks.

To determine whether realistic snacks containing added sugar evoke excessive insulin responses, 10 healthy subjects consumed four different snack meals, similar in fat and total energy content. Two snacks were based on sugary, manufactured products (chocolate-coated candy bar; cola drink with crisps) and two on whole foods (raisins and peanuts; bananas and peanuts). After the processed-food snacks, plasma-glucose levels tended to rise higher and to fall lower than after the whole-food snacks. The area under the plasma insulin curve was 70% greater after the manufactured snacks than after the raisin-peanut snack. The banana-peanut snack evoked an intermediate insulin response. One subject had pathological insulinaemia after both manufactured snacks but normal responses after both whole-food snacks. These findings suggest that foods and drinks containing added fiber-depleted sugars stress and sometimes overwhelm homeostatic mechanisms but also suggest that the insulin response to food is influenced by the physical state of the food.

Adult↗
PubMed1989

Hot flushes are induced by thermogenic stimuli.

Hot flushes were caused by hot drinks, alcohol, radiant heaters and thermal blankets in men undergoing treatment for carcinoma of the prostate and in menopausal women. Avoiding or changing these commonplace stimuli appears to reduce the frequency of flushing.

Aged↗
PubMed2004

Food and macronutrient intake of elite kenyan distance runners.

The food and macronutrient intake of elite Kenyan runners was compared to recommendations for endurance athletes. Estimated energy intake (EI: 2987 +/- 293 kcal; mean +/- standard deviation) was lower than energy expenditure (EE: 3605 +/- 119 kcal; P < 0.001) and body mass (BM: 58.9 +/- 2.7 kg vs. 58.3 +/- 2.6 kg; P < 0.001) was reduced over the 7-d intense training period. Diet was high in carbohydrate (76.5%, 0.4 g/kg BM per day) and low in fat (13.4 %). Protein intake (10.1 %; 1.3 g/kg BM per day) matched recommendations for protein intake. Fluid intake was modest and mainly in the form of water (1113 +/- 269 mL; 0.34 +/- 0.16 mL/kcal) and tea (1243 +/- 348 mL). Although the diet met most recommendations for endurance athletes for macronutrient intake, it remains to be determined if modifying energy balance and fluid intake will enhance the performance of elite Kenyan runners.

Adult↗
PubMed2006

Consumption of sugar and sugar-sweetened foods and the risk of pancreatic cancer in a prospective study.

BACKGROUND: Emerging evidence indicates that hyperglycemia and hyperinsulinemia may be implicated in the development of pancreatic cancer. Frequent consumption of sugar and high-sugar foods may increase the risk of pancreatic cancer by inducing frequent postprandial hyperglycemia, increasing insulin demand, and decreasing insulin sensitivity. OBJECTIVE: The objective of the study was to examine prospectively the association of the consumption of added sugar (ie, sugar added to coffee, tea, cereals, etc) and of high-sugar foods with the risk of pancreatic cancer in a population-based cohort study of Swedish women and men. DESIGN: A food-frequency questionnaire was completed in 1997 by 77 797 women and men aged 45-83 y who had no previous diagnosis of cancer or history of diabetes. The participants were followed through June 2005. RESULTS: During a mean follow-up of 7.2 y, we identified 131 incident cases of pancreatic cancer. The consumption of added sugar, soft drinks, and sweetened fruit soups or stewed fruit was positively associated with the risk of pancreatic cancer. The multivariate hazard ratios for the highest compared with the lowest consumption categories were 1.69 (95% CI: 0.99, 2.89; P for trend = 0.06) for sugar, 1.93 (1.18, 3.14; P for trend = 0.02) for soft drinks, and 1.51 (0.97, 2.36; P for trend = 0.05) for sweetened fruit soups or stewed fruit. CONCLUSION: High consumption of sugar and high-sugar foods may be associated with a greater risk of pancreatic cancer.

Aged↗
PubMed1999

Prostate cancer chemoprevention by green tea: in vitro and in vivo inhibition of testosterone-mediated induction of ornithine decarboxylase.

Recently, we have shown that ornithine decarboxylase (ODC), a rate-controlling enzyme in the polyamine biosynthetic pathway, is overexpressed in prostate cancer (PCA) and prostatic fluid in humans (R. R. Mohan et al., Clin. Cancer Res., 5: 143-147, 1999). ODC is also characterized as an androgen-responsive gene, and the androgenic stimulation regulates the development and growth of both normal and tumorigenic prostate cells. Thus, chemopreventive approaches aimed toward the modulation of ODC could be effective against PCA. Green tea polyphenols (GTPs) possess strong chemopreventive properties against a variety of animal tumor models and in some human epidemiological studies. At least two epidemiological studies have suggested that people who consume tea regularly may have a decreased risk of PCA. In this study, we investigated the effect of GTPs against testosterone-mediated induction of ODC in human prostate carcinoma cells, LNCaP as an in vitro model, and in Cpb:WU rats and C57BL/6 mice as in vivo models. Treatment of LNCaP cells with testosterone resulted in induction of ODC activity in a dose-dependent manner. Pretreatment of the cells with GTPs resulted in a significant inhibition of testosterone-caused induction of ODC activity in a dose-dependent manner. Similar effects of GTPs were observed in anchorage-independent growth assay of LNCaP cells where pretreatment of the cells with GTP was found to result in dose-dependent inhibition of colony formation. Testosterone treatment of the cells resulted in a significant increase in the level of ODC mRNA, and this increase was almost completely abolished by prior treatment of the cells with GTPs. The administration of testosterone (10 mg/kg body weight, i.p.) to sham-operated and castrated Cpb:WU rats resulted in 2- and 38-fold increases in ODC activity, respectively, in the ventral prostate. Oral feeding of 0.2% GTPs in drinking water for 7 days before testosterone administration resulted in 20 and 54% decreases in testosterone-caused induction of ODC activity in sham-operated and castrated rats, respectively. Similar results were obtained with C57BL/6 mice, where testosterone treatment at similar dosage resulted in a 2-fold increase in ODC activity in the ventral prostate and prior oral feeding with 0.2% GTPs resulted in 40% inhibition in this induction.

Adenocarcinoma↗
PubMed1986

Pancreas cancer and smoking, beverage consumption, and past medical history.

Four hundred and ninety pancreas cancer patients representative of confirmed cases in Los Angeles County residents of working age were compared to healthy controls individually matched by age, sex, race, and neighborhood. Home interviews were conducted on occupation, smoking, food and beverage consumption, and medical history. Cigarette smoking was a strong and consistent predictor of pancreas cancer occurrence; the effect disappeared after a decade of nonsmoking, and there was no increase in risk among current smokers as daily dose increased. There was no link between pancreas cancer and past consumption of tea, carbonated beverages, beer, or spirits; and an association with coffee consumption was inconsistent. A strong association between pancreas cancer and history of subtotal gastrectomy at any past time could not be explained by chance or any other factor. Pancreas cancer patients had experienced fewer allergies of any kind.

Alcohol Drinking↗
PubMed2000

Association of Helicobacter pylori infection with lifestyle, chronic disease, body-indices, and age at menarche in Danish adults.

This study examines the association between lifestyle factors, chronic disease, body-indices, and the seroprevalence of Helicobacter pylori infection in Danish adults. The relationship between age at menarche and H. pylori infection is also assessed. A random sample of 3,608 Danish adults completed a questionnaire about lifestyle factors (smoking habits, alcohol consumption, and coffee and tea intake), doctor diagnosed chronic diseases (heart conditions, diabetes, chronic bronchitis, and hypertension), menarche, and socio-demographic factors. A total of 2,913 participants were eligible for the present study. Electrocardiographs were recorded and blood pressure and serum lipid levels (HDL cholesterol, triglyceride, and cholesterol) were measured. Height and weight were determined and body mass index (BMI) calculated. Sera were analysed with an enzyme-linked immunosorbent assay for the presence of H. pylori specific IgG antibodies. The seroprevalence of H. pylori infection was associated with weekly alcohol intake > or = 6 drinks (odds ratio 0.7, 95% confidence interval 0.6-0.9) due to a low rate of H. pylori infection among wine drinkers (odds ratio 0.6, 95% confidence interval 0.5-0.7). No associations were found with smoking habits or serum lipids. People with upper quartile BMI (> or = 26.8 kg/m2) were more likely to be seropositive for antibodies to H. pylori (odds ratio 1.6, 95% confidence interval 1.1-2.4). Chronic bronchitis (odds ratio 1.6, 95% confidence interval 1.1-2.5) and unspecified heart condition (odds ratio 2.0, 95% confidence interval 1.1-3.3) was more often seen in IgG seropositive women than in uninfected women. The likelihood of being seropositive for IgG antibodies to H. pylori increased with age at menarche (odds ratio per year 1.10, 95% confidence interval 1.02-1.19). Previously reported associations with age and socioeconomic status were confirmed. We conclude that wine drinking is associated with lower rates of H. pylori infection in Danish adults. The seroprevalence of H. pylori infection is increased in people with high BMI. H. pylori infection may relate to a history of late menarche and chronic bronchitis in Danish women.

Adolescent↗
PubMedDate not supplied

Dietary silica modifies the characteristics of endothelial dilation in rat aorta.

Considering the importance of nitric oxide generation in the regulation of vessel tone, reduced endothelial nitric oxide synthase (eNOS) expression in alveolar macrophages exposed to short-term silica (Si) suggests the possibility of Si-induced changes in endothelial functions. In this experimental study, the functional changes of the endothelial cells were investigated in the aortic rings of rats subjected to 50 mg Si/kg body weight in their drinking water for 8 days. Norepinephrine elicited contractility and dilation response to acetylcholine (ACh) was significantly high in the aortic rings of Si-treated group. Alteration in receptor-independent endothelial response to A23187 in the aortic rings of Si-exposed rats was less obvious, but sodium nitroprusside (SNP)-elicited dilation was reduced significantly. A23187-induced relaxation was fully eliminated with N-nitro-L-arginine methyl ester (L-NAME) pretreatment, whereas 19.24 +/- 4.36% of ACh response was L-NAME resistant and eliminated with 10-5 M tetraethylammonium (TEA). Despite a significant reduction in the share of NO, the contribution of indomethacine (IND)-sensitive relaxation to ACh response remained unchanged in Si group. As a result, our findings demonstrated that Si both modifies the characteristics of endothelial relaxants and attenuates smooth muscle cell responsiveness to NO. Si-induced reduced NO association with elevated endothelium-derived hyperpolarizing factor (EDHF) in response to ACh, together with reduced NO sensitization, might have clinical importance in cardiovascular pathology.

Animals↗
PubMed1997

Sociocultural factors and the promotion of exclusive breastfeeding in rural Yoruba communities of Osun State, Nigeria.

Child survival strategies include prolonged and intensive breastfeeding, together with its early initiation, and breastmilk only for the first six months of life. This paper reports on local knowledge and attitudes of breastfeeding and the sociocultural factors that shape its practice in poor rural Yoruba communities of Southwestern Nigeria. The study has conducted 10 focus group discussions among homogeneous groups of grandmothers, pregnant women, lactating mothers, husbands, and community health workers, and a questionnaire survey of 256 third trimester pregnant women. All women in these communities breastfeed their infants on demand, and for up to two years, because breastmilk is universally accepted as the best food for babies, and breastfeeding spaces births. Prelacteal feedings of water herbal infusions and ritual fluids are the norm, and breastmilk is supplemented, from birth, with water and teas. Exclusive breastfeeding is considered dangerous to the infant: the baby has an obligatory requirement for supplementary water to quench its thirst and promote its normal development, and for herbal teas which serve as food and medicine. Colostrum is discarded because it is dirty, "like pus", and therefore potentially harmful to the infant, although 24% of the survey sample would give it to their babies. Expressed breastmilk is suspect as it can get contaminated, poisoned or bewitched. Complementary foods are introduced as early as two months because of perceived lactation insufficiency. The commonest supplement is a watery maize porridge of low nutrient density. Breastfeeding can also be dangerous, as toxins and contaminants can be passed to the infant through breastmilk. The most serious conflict with the WHO/UNICEF recommendations is the lack of local credibility of exclusive breastfeeding. According to local knowledge, the early introduction of water, herbal teas, and of complementary foods is designed to enhance child survival, while these are supposed to do the exact opposite by the WHO/UNICEF rationale, by exposing the infant to contaminants early, thereby increasing diarrheal morbidity and mortality. Child survival interventions need to address this conflict.

Attitude to Health↗
PubMed1985

Primary liquid intake and urinary stone disease.

This investigation indicates that there are important associations between urinary stone disease and a person's primary liquid intake. Based on data collected from 2295 caucasian male patients from two geographical regions, the Carolinas (both North and South) and the Rockies (including Colorado, Idaho, Nevada, Montana, Utah and Wyoming) an important (p less than 0.01) positive association was found between urinary stone disease and soda (carbonated beverage) consumption within both geographical regions. It was also found that negative associations exist between urinary stone disease and both beer consumption and coffee consumption in the Rockies and that no important associations exist between urinary stone disease and any of milk, water, or tea, when these beverages represent a person's primary liquid intake. Moreover, soda can be viewed almost synonymously as sugared cola, since few subjects had diet sodas or sugared non-cola soda as primary fluid. No cause/effect relationships are implied in this paper.

Adolescent↗
PubMed1997

Health and dietary characteristics of supplement users in an elderly population.

The purpose of this study was to investigate the association of health and dietary characteristics with the use of vitamin and mineral supplements in community-dwelling, cognitively intact elders aged in their 60s (n = 89), 80s (n = 92), and 100s (n = 76) who resided in Georgia in the southeastern United States. Elders who were physically active (p = 0.008), had stomach problems (p = 0.042), or used arthritis medication (p = 0.015) were more likely to take a nutritional supplement than elders without these characteristics. Physically active elders were more likely to take calcium (p = 0.004), vitamin E (p = 0.022), and vitamin C (p = 0.046) than non-physically active elders. Compared to non-users, supplement users were also more likely to comply with nutritional health seeking behaviors such as avoiding too much salt, fat, cholesterol, sugar, caffeine, and eating enough fiber, vitamins and minerals from food or supplements, and calcium in foods or supplements. The observation that the use of certain vitamin or mineral supplements is associated with dietary fat intakes, dietary protein intakes, and patterns of alcohol, decaffeinated coffee, and tea consumption suggests that supplement use is one of a cluster of health behaviors. Thus, it may be important that future investigations concerning the impact of supplement use on diseases, such as heart disease or cancer, control for the effects of dietary patterns and physical activity.

Aged↗
PubMed1998

Protection of UV-induced suppression of skin contact hypersensitivity: a common feature of flavonoids after oral administration?

In this study we investigated the effect of the dietary ingredients fruit and vegetable, green tea phenol extract (GTP) and the specific flavonoid components quercetin and chrysin on the UV-induced suppression of the contact hypersensitivity (CHS) response to picryl chloride (PCl). The SKH-1 mice were fed with test diet from 2 or 4 weeks before and during the UV irradiation (daily, 95 mJ/cm2) and tested for the CHS ear-swelling response 10 weeks after the onset of the irradiation. For the CHS, mice were immunized with PCl by epicutaneous application on nonirradiated sites. Four days after sensitization all mice were challenged on both sides of each ear by topical application of one drop PCl. In addition, from mice fed with the fruit and vegetable mixture the number of Langerhans cells (LC) were scored in the skin and from mice fed with quercetin, quercetin levels in plasma were measured at week 11 after the start of UV irradiation. It was found that fruit and vegetable (19% in the diet), GTP (0.1% and 0.01% in the drinking water), quercetin (1% in the diet) and chrysin (1% and 0.1% in the diet), prevented statistically significantly the UV-induced suppression of CHS to PCl. In the skin of mice fed with fruit and vegetables combined with UV irradiation the number of LC were comparable to the control mice, whereas the number of LC were significantly diminished in mice treated with UV only. This protective effect on the presence of LC in the epidermis after UV irradiation, which was also observed in a previous study with quercetin, may play a role in the prevention of UV-induced immunosuppression by the flavonoids tested. In conclusion, we found protection of flavonoids against UV-induced effects on CHS, which may be a common feature of most flavonoids.

Animal Feed↗
PubMed2005

Biochemical and etiological characteristics of acute hyponatremia in the emergency department.

Hyponatremia can be classified as acute or chronic depending on its duration, and treatment options are tailored to this classification. However, it is sometimes difficult to differentiate acute from chronic hyponatremia in the Emergency Department (ED). The objective of this study was to identify characteristics to help diagnose and manage acute hyponatremia in the ED. Patients with acute hyponatremia in the ED were enrolled from a retrospective 2-year chart review. Eleven patients (0.8%) were identified with acute hyponatremia out of a total of 1321 hyponatremic patients. There were nine women and two men. The mean age was 48.9 years. The mean sodium (Na(+)) level was 115+/-4 mmol/L. Accompanying biochemical abnormalities included hypouricemia and hypouremia with increased fractional excretions of uric acid (UA) and urea. The estimated amount of water intake ranged from 2.5 to 10 liters (mean, 5.1+/-2.3 liters) during the day before ED presentation. All patients were treated with hypertonic saline and furosemide at a correction rate of 1.6+/-0.5 mmol/L/h. No patients had neurological sequelae after treatment. The causes of acute hyponatremia included induction of abortion with oxytocin (n=1), primary polydipsia on neuroleptic agents (n=2), polyethylene glycol (PEG) preparation for colonoscopy (n=1), diuretic therapy for hypertension (n=4), ecstasy use (n=1), and weight-reducing herbal teas (n=2). We conclude that in the right clinical setting, high free water intake and low serum urea and UA favor acute hyponatremia. A detailed drug history may be helpful in the differential diagnosis of acute hyponatremia.

Acute Disease↗
PubMedDate not supplied

The association of milk consumption with the occurrence of symptomatic knee osteoarthritis.

OBJECTIVE: To evaluate the association of nutritional factors with symptomatic knee OA. METHODS: This cross-sectional study was performed face-to-face using a structured interview. Individuals who had a diagnosis of symptomatic knee OA and were aged 50 years or over were included in this study. The frequency of consumption of dairy products, meat/poultry, fish, cereals, vegetables, tea and coffee were also determined. The diagnosis of knee OA was made clinically or clinically and radiologically according to the ACR criteria for knee OA. RESULTS: A total of 655 subjects was interviewed. The frequency of symptomatic knee OA was significantly lower in daily milk consumers (p < 0.05). Tea consumption was also inversely associated with symptomatic knee OA (p < 0.05), although other nutritional elements showed no significant relationship with OA. CONCLUSION: Milk consumption may have beneficial effects on symptomatic knee OA.

Aged↗
PubMed2000

Arsenic methylation capacity and skin cancer.

Chronic ingestion of arsenic from drinking water is associated with the occurrence of skin cancer. To clarify the role of arsenic methylation capacity in the development of arsenic-associated skin lesions, an epidemiological case-control study was conducted in the southwestern region of Taiwan, in which 26 skin disorder patients were matched with control subjects. The objective of this study was to determine whether arsenic methylation capacity of patients with skin disorders differed from that of matched controls. Both cases and controls had been exposed to similar high concentrations of arsenic in drinking water. Results indicated that skin lesion cases had higher percents of inorganic arsenic (InAs, 13.1+/-3.7%), methylarsonic acid (MMA, 16.4+/-3.2%), lower percent of dimethylarsinic acid (DMA, 70.5+/-5.8%), and higher ratio of MMA to DMA (MMA/DMA, 0.24+/-0.06) than matched controls (InAs: 11.43+/-2.1%; MMA: 14.6+/-2.6%; DMA: 73.9+/-3.3%; MMA/ DMA: 0.20+/-0.04). Individuals with a higher percentage of MMA (>15.5%) had an odds ratio of developing skin disorder 5.5 times (95% confidence interval, 1.22-24.81) higher than those having a lower percentage of MMA. This association was not confounded by hepatitis B surface antigen, cigarette smoking, or alcohol and tea consumption. It is concluded that arsenic biotransformation including methylation capacity may have a role in the development of arsenic-induced skin disorders.

Aged↗
PubMed1988

Fluid intake and bladder cancer in Utah.

A population-based, incident case-control study was conducted in Utah to assess the relationship between fluid intake and bladder cancer. Cancer cases (n = 419) were identified through the Utah Cancer Registry, and controls (n = 889) were obtained through random digit dialing and the Health Care Financing Administration. After adjustment for cigarette smoking, age, sex, history of diabetes, and history of bladder infections using multiple logistic regression analysis, total fluid intake was not found to be related to bladder cancer development. Specific fluids related to bladder cancer risk were milk intake (OR = 0.64) and caffeinated coffee intake (OR = 1.60). A linear trend for a dose-response protective effect was observed for milk, while coffee increased risk only when 40 or more cups were consumed per week. Alcohol increased risk only when consumed at high levels (over 3.64 ounces or 103 g per week) by people who never smoked cigarettes (OR = 2.37). Likewise, tea consumption in non-cigarette smokers increased bladder cancer risk (OR = 2.25). Results from this study suggest that types of fluids consumed may play a role in the development of bladder cancer. Furthermore, it is hypothesized that the dietary components of these beverages may be related to the development of bladder cancer.

Adult↗