Abstract
We investigated the association between urinary tract infections (UTIs) and transitional cell carcinoma of the bladder in a population-based case–control study in Los Angeles covering 1586 cases and age-, gender-, and race-matched neighbourhood controls. A history of bladder infection was associated with a reduced risk of bladder cancer among women (odds ratio (OR), 0.66; 95% confidence interval (CI), 0.46–0.96). No effect was found in men, perhaps due to power limitations. A greater reduction in bladder cancer risk was observed among women with multiple infections (OR, 0.37; 95% CI, 0.18–0.78). Exclusion of subjects with a history of diabetes, kidney or bladder stones did not change the inverse association. A history of kidney infections was not associated with bladder cancer risk, but there was a weak association between a history of other UTIs and slightly increased risk among men. Our results suggest that a history of bladder infection is associated with a reduced risk of bladder cancer among women. Cytotoxicity from antibiotics commonly used to treat bladder infections is proposed as one possible explanation.
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Main
Urinary tract infections (UTIs) are the most common kidney and urologic diseases in the US, especially among women. About 50% of women have at least one symptomatic infection during their lifetime, and many have recurrent episodes (Stamm, 2002). However, UTIs in men are uncommon until after age 50, and are usually indicative of an underlying urologic abnormality (Stamm and Hooton, 1993). In the US, the majority of uncomplicated UTIs are caused by Escherichia coli (80%) or Staphylococcus saprophyticus (10–15%) (Stamm, 2002). An experimental study in rats has shown associations between chronic infections with Escherichia coli and early bladder neoplasia (Davis et al, 1991), and it has been suggested that the high rates of bladder cancer in some parts of Africa and the Middle East may be due to the high prevalence of chronic infection with Schistosoma haematobium (IARC, 1994). A review of published epidemiological studies regarding the association between bladder infections and transitional cell carcinoma (TCC), the predominant type in developed countries, shows inconsistent results (Howe et al, 1980; Kantor et al, 1984; Claude et al, 1986; Piper et al, 1986; Kjaer et al, 1989; Gonzalez et al, 1991; La Vecchia et al, 1991; Sturgeon et al, 1994; Jhamb et al, 2007) and reveals a need for future studies to determine whether UTIs increase the risk of bladder cancer.
We collected detailed information on UTIs in a large population-based case–control study of bladder cancer in Los Angeles County, where we have identified risk factors including cigarette smoking (Castelao et al, 2001) and use of permanent hair dyes among women (Gago-Dominguez et al, 2001, 2003), and protective factors including use of non-steroidal anti-inflammatory drugs (NSAIDs) (Castelao et al, 2000) and consumption of carotenoids and vitamin C (Castelao et al, 2004).
Materials and methods
Cases were identified through the Los Angeles County Cancer Surveillance Program – the largest of the National Cancer Institute's Surveillance, Epidemiology and End Results (SEER) cancer registries (Bernstein and Ross, 1991). Eligibility criteria included histologically confirmed bladder cancers diagnosed between January 1, 1987 and April 30, 1996 among non-Asians between the ages of 25 and 64 years. In total, 2384 cases were identified. Of these, 210 (9%) died before we could contact them or were too ill to be interviewed. Permission to contact 99 (4%) patients was denied by their physicians, and 404 (17%) patients declined to participate in the study. We interviewed 1671 (70%) of the cases.
For each enrolled case, a standard procedure was followed to recruit a control subject from the neighbourhood of the residence of the case at the time of cancer diagnosis, with the control matched to the case by age (within 5 years), sex, and race (non-Hispanic white, Hispanic white, or African American/others). We attempted to identify the age, sex, and race of all inhabitants of each housing unit; ‘not at home’ units were systematically revisited to complete the census. The first resident along this defined route who satisfied all eligibility criteria for controls was asked to participate in this study (i.e. first eligible control). If that individual refused, the next eligible control (i.e. second eligible control) in the sequence was asked and so on until we located an eligible control who agreed to be interviewed. When we failed to find any resident who met our matching criteria after canvassing 150 housing units, we excluded race from the matching criteria. If a matched control subject based on this relaxed criterion could not be found within a maximum of 300 housing units, the case was dropped from the study. For the 1671 interviewed patients, a matched control could not be found for 5% (85) of the interviewed cases. Among the 1,586 eligible control subjects, 1090 (69%) control subjects were first eligible controls, 325 (20%) were second eligible controls and 111 (7%) were third eligible controls, and the remaining 60 (4%) control subjects were fourth or higher eligible controls. Twenty-one control subjects were not matched to the index case by race. Therefore, a total of 1586 pairs of cases and controls were included in the analyses. All study subjects signed informed consent forms. The study was approved by the Institutional Review Board at the University of Southern California, Keck School of Medicine.
All study cases and controls were interviewed at home by trained interviewers using a structured questionnaire. The structured questionnaire requested information up to 2 years before diagnosis of cancer for the cases, and up to 2 years before diagnosis of cancer of the index case for the matched controls (i.e. reference year). Each subject was asked to report information on demographic characteristics, lifetime use of tobacco products and alcohol, usual adult dietary habits, lifetime occupational history, prior medical conditions, and prior use of medications. The questionnaire included questions on history of physician-diagnosed hypertension, diabetes, angina, heart attack, stroke, analgesic nephropathy, renal papillary necrosis, kidney/renal stones, bladder stones, polycystic kidney disease, hereditary kidney disease, and injury to kidney. After January 1992, a history of tuberculosis, thyroid disease, polycythemia vera, and gout was also asked. For each medical condition, we asked the year of first diagnosis by a doctor. In addition, we asked the participants if they were told by a doctor that they had kidney infections, bladder infections, or other type of UTIs. If so, the year of first and last diagnosis and total number of diagnoses were also requested.
Statistical analysis
The associations of bladder cancer with medical histories were measured by odds ratios (ORs) and their corresponding 95% confidence intervals (CIs) and P-values. Conditional logistic regression models were used to examine the relationship between any medical history and bladder cancer risk with adjustment for the following risk factors for bladder cancer: number of cigarettes smoked per day, number of years of smoking, smoking status in the reference year (smoker or nonsmoker) (Castelao et al, 2001), level of education (high school or less, some college, college or above), total number of NSAID pills used over the lifetime (non/irregular user, <1441 pills, ⩾1441 pills used over lifetime) (Castelao et al, 2000), intake of carotenoids (quintiles) (Castelao et al, 2004), and duration of employment as a hairdresser/barber (years) (Castelao et al, 2001). There were no material changes in the results with further adjustment for hair dye use, and thus this variable was not retained. Unconditional logistic regression was used in the analyses stratified by smoking status (lifetime nonsmokers vs ever smokers). In addition to all the covariates mentioned above, strata defined by age and sex (age groups of <46, 46–50, 51–55, 56–60, and >60 years for each sex), and racial/ethnic groups (non-Hispanic white, Hispanic white, or African American/others) were included in the regression model to account for the matched sampling. All results were similar when we limited our analyses to non-Hispanic whites only, or when we excluded from our analyses the case–control pairs that were not matched on race. Owing to this, and in order to maximize our study power, all study subjects were included in our analyses.
Statistical analyses were performed using the SAS version 9.1 (SAS Institute Inc., NC, USA). ORs with two-sided P-values <0.05 were considered statistically significant. All P-values, estimated from likelihood ratio test, were two-sided.
Results
A history of one or more UTIs was reported by 26% of cases and 28% of controls (Table 1), occurring more frequently in women (47% of cases and 57% of controls) than in men (20% of cases and 20% of controls). In women, the most frequent UTIs were bladder infections; in men, however, UTIs occurred more frequently in urinary tract organs other than the kidney and bladder, presumably in the urethra and ureter. Thus, among the 200 control women reporting a history of UTI, 169 (85%) reported a history of bladder infections, 43 (22%) reported kidney infections, and only 18 reported (9%) other UTIs. The corresponding figures among the 242 control men reporting a history of UTI were 100 (41%), 52 (21%), and 115 (48%), respectively.
A history of any UTI was not associated with bladder cancer among all subjects, men and women combined (OR, 1.00; 95% CI, 0.83–1.20; Table 1). Women reporting a history of UTI had a 26% reduction in bladder cancer risk (OR, 0.74; 95% CI, 0.53–1.03) than women reporting no history of any UTI; however, this reduction did not reach statistical significance. A history of kidney infection or other UTIs was not significantly associated with bladder cancer; however, the risk was slightly elevated at borderline significance level among men reporting a history of other UTIs (OR, 1.35; 95% CI, 0.99–1.83), especially among those reporting infection occurring within 5 years of cancer diagnosis (within 5 years of cancer diagnosis: OR, 3.01; 95% CI, 1.26–7.23; ⩾5 years before cancer diagnosis: OR, 1.17; 95% CI, 0.83–1.64).
Bladder infections were much more frequent among women than among men in our study (48 vs 8%, respectively). Overall, a history of bladder infection was associated with a slightly reduced risk of bladder cancer (OR, 0.80; 95% CI, 0.63–1.02; Table 1), although the association was not statistically significant. This inverse association was, however, seen only in women (OR, 0.66; 95% CI, 0.46–0.96). Exclusion of women with a bladder infection within 5 years of cancer diagnosis strengthened the inverse association (OR, 0.52; 95% CI, 0.34–0.81; Table 2), suggesting that the observed inverse bladder infection–bladder cancer association was unlikely to be caused by bladder infections resulting from the bladder cancer. Thus, all subsequent analyses were restricted to women who did not have a history of recent bladder infections. We also assessed the association between number of episodes of bladder infections and bladder cancer risk. The largest reduction in risk was observed in women with more than three episodes of infections (OR, 0.37; 95% CI, 0.18–0.78; Table 2). We also explored the potential modifying effect of age at first and last infection in our observed inverse association, although the data were too sparse to make any strong conclusions. Among women who did not report a history of recent bladder infections, the reported median ages at first and last infection were 29 and 37 years, respectively. The infection-associated reduction in risk seemed to be similar between women who had their first episode of bladder infection at a younger age (<29) and those who had their first episode of bladder infection at an older age (⩾29) (Pheterogeneity=0.76). Similarly, no significant differences in risk were observed by age at last infection (Pheterogeneity=0.81).
The inverse association between bladder infections and bladder cancer was observed in all categories of smoking (Table 3), although the association was particularly strong among former smokers (P⩾1 vs 0=0.002). The OR associated with a history of multiple bladder infections (>3) was 0.43 (95% CI, 0.11–1.68) among nonsmokers, 0.21 (0.07–0.68) among former smokers, and 0.69 (0.20–2.39) among current smokers.
In our study population, control subjects with a history of bladder infection were more likely to use NSAIDs (42.7%) than those without such a history (33.3%, P=0.004). Therefore we further analysed data stratified by the use of NSAIDs. The inverse association between bladder infection and bladder cancer among women was present in both users (OR, 0.54; 95% CI, 0.29–1.03) and non-users of NSAIDs (OR, 0.52; 95% CI, 0.31–0.87), with a P-value of 0.87 for the interaction between use of NSAIDs and bladder infection on cancer risk (data not shown).
To investigate whether the bladder infection-bladder cancer association varied across strata defined by other known risk/protective factors in this study, including age, level of education (Jiang et al, 2007), alcohol consumption (Jiang et al, 2007), water intake (Jiang et al, 2008), and intake of carotenoids (Castelao et al, 2004), stratified models were fit according to the levels of those variables. An inverse association between bladder infection and bladder cancer was observed in virtually all subgroups (data not shown).
Regarding grade and stage of disease, a history of bladder infection was significantly associated with a reduced risk of only invasive (T1–T4) bladder cancers (P⩾1 vs 0=0.005; Table 4), but not non-invasive (Ta) bladder cancers (P⩾1 vs 0=0.11). In addition, the protective effect differed by grade, with the effect being more pronounced for high-grade (grade 3–4) cancers (P⩾1 vs 0=0.0004).
A history of diabetes was associated with an increased risk of bladder cancer (OR, 1.70; 95% CI, 1.18–2.45), whereas a history of kidney stones was associated with a slight increase in bladder cancer risk (OR, 1.24; 95% CI, 0.94–1.64). A history of bladder stones, which was reported only by very few subjects (10 cases and 11 controls), was not associated with bladder cancer risk (OR, 0.79; 95% CI, 0.30–2.10). The inverse association with bladder infections was materially unchanged after excluding subjects with a history of diabetes, kidney, and/or bladder stones.
Discussion
UTIs are very common among women (Stamm, 2002), but uncommon among men until after the age of 50 years (Stamm and Hooton, 1993). Bladder infection is the most common UTI among women in the US (Sheffield and Cunningham, 2005). Our study found a significant association between bladder infections and reduced risk of bladder cancer among women, with the highest protection found among women who experienced multiple infections. This inverse association was confined to invasive high-grade bladder cancers.
A number of case–control studies have examined the possible association of UTIs with bladder cancer in developed countries (Howe et al, 1980; Kantor et al, 1984; Claude et al, 1986; Piper et al, 1986; Kjaer et al, 1989; Gonzalez et al, 1991; La Vecchia et al, 1991; Sturgeon et al, 1994; Jhamb et al, 2007). The overall evidence supports an increased risk from UTIs. However, in general, a much higher risk was observed for infections occurring approximately within 5 years of cancer diagnosis, and the risk was substantially reduced or disappeared when infections occurred many years before cancer diagnosis (Howe et al, 1980; Gonzalez et al, 1991; La Vecchia et al, 1991; Jhamb et al, 2007). As the dates of UTIs were not obtained in all these studies, it is also possible that the occurrence of UTIs may be a consequence of early bladder cancer before its diagnosis, rather than a cause of the disease. Alternatively, UTIs may have a later-stage effect in bladder carcinogenesis by promoting initiated tumors (La Vecchia et al, 1991). In addition, studies that found increased risks from UTIs (Claude et al, 1986; Kantor et al, 1988; Gonzalez et al, 1991) did not discriminate between the different types of UTI. This is an important consideration, as different types of UTI may have different impacts on bladder cancer risk. A history of cystitis has been reported to be associated with an increased bladder cancer risk, but a history of kidney infection was associated with a significantly decreased risk (Jhamb et al, 2007). In our study, a decreased risk of bladder cancer for bladder infections was found among women, but an increased risk for infections occurring in urinary tract organs other than kidney and bladder, presumably urethra, was found in men. The majority of urethritis in men are secondary to sexually transmitted diseases such as chlamydia and gonorrhoea (Wong and Stamm, 1983), which has been found to be associated with a significantly increased risk in three studies (Mommsen and Sell, 1983; La Vecchia et al, 1991; Michaud et al, 2007). If a history of UTI indeed increased the risk, one would expect a higher incidence of bladder cancer among women than among men, as well as a higher incidence of squamous cell carcinoma of the bladder vs TCC (Burin et al, 1995). However, bladder cancer is 3–4 times more common in men than in women, and approximately 90% of bladder cancer in the US are TCCs (with only 7% being of squamous cell carcinoma type) (Yu and Ross, 2002). Human and experimental studies have shown that bladder infections induce squamous metaplasia of the bladder, a process that may subsequently lead to squamous cell carcinoma of the bladder, but not to TCC (Burin et al, 1995), which is also supported by the strong associations between bladder infections and squamous cell carcinomas of the bladder, and not with TCC (IARC, 1994; Burin et al, 1995; Michaud, 2007).
Our study found a significant association between bladder infections, especially multiple infections, and reduced risk of bladder cancer. There are several possible reasons to explain these findings: (1) the anti-cancer effect of antibiotics used to treat bladder infections; (2) the higher intake of NSAIDs among subjects with a history of bladder infection; and (3) the immune response triggered by bladder infection.
In experimental studies, antibiotics used to treat bladder infections have been found to inhibit bladder cancer growth (Seay et al, 1996; Ebisuno et al, 1997; Aranha et al, 2000, 2002; Kamat and Lamm, 2004). The traditional treatment of uncomplicated UTIs has been a short course of antibiotics such as amoxicillin, trimethoprim (TMP) alone or with sulfamethoxazole (TMP-SMX), nitrofurantoin, cephalosporins, and fosfomycin (Stamm, 2002). Antibiotic agents preferred for UTIs are agents that are primarily excreted through the urinary tract and achieve prolonged and high concentrations in the urine (Stamm, 2002). About 70–90% of TMP and 30% of SMX are excreted unchanged in the urine (Masters et al, 2003). Besides their bactericidal effect, the commonly used antibiotics TMP-SMX, cefazolin (cephalosporin), and nitrofurantoin significantly inhibited cell proliferation in human TCC cell lines (Seay et al, 1996), producing a proliferation inhibition rate as high as 95%. Inhibition occurred in a dose-dependent manner at concentrations attainable in the urine after oral administration (Kamat and Lamm, 2004). Similar dose–response anti-cancer effects were shown for ciprofloxacin or other fluoroquinolones (Seay et al, 1996; Ebisuno et al, 1997; Kamat and Lamm, 2004). The mechanism for the antibiotics’ cytotoxicity against bladder cancer cells remains unclear. Ciprofloxacin has been shown to cause cell-cycle arrest, disruption of calcium homeostasis, mitochondrial swelling, and redistribution of Bax (a pro-apoptotic protein) to the mitochondrial membrane, eventually leading to apoptosis in human TCC lines (Aranha et al, 2000, 2002).
As subjects with a history of bladder infection were more likely to use NSAIDs regularly than subjects without such a history, and intake of NSAIDs was earlier found to be negatively associated with bladder cancer in this population (Castelao et al, 2000), the inverse association risk was plausibly the result of excessive use of NSAIDs among subjects with a history of bladder infection. However, the protective effect of bladder infection was observed among both regular users and non- or irregular users of NSAIDs; therefore, the use of NSAIDs was unlikely to explain our observed protective effect.
Another mechanism that may explain our finding is the anti-cancer effect of the immune response triggered by bladder infections. BCG immunotherapy for bladder cancer has been widely accepted for its effect in decreasing recurrence rates and in increasing median time to recurrence (Alexandroff et al, 1999). BCG infection induces release of chemokines/cytokines, attracts and activates neutrophils, macrophages and T-cells, resulting in improved recognition and killing of tumor cells (Alexandroff et al, 1999). Bladder infection, which is mostly caused by E. coli in humans, may trigger an immune response similar to BCG treatment, killing hyperplastic cells before they transform into cancerous cells (Zasloff, 2007).
The infection–cancer association was modified by frequency of bladder infections, with the highest reduction in risk confined to women with ⩾2 bladder infections. An estimated 20–30% of women with a first UTI will have recurrent episodes, and 5% will have chronic recurrent infections (Foxman et al, 2000). For women who have recurrent infections, a low-dose antimicrobial prophylaxis taken daily or thrice weekly for 3–6 months is recommended to prevent recurrent infections (Stamm and Hooton, 1993; Fihn, 2003). Dosage seems to play a role in the anticancer effect of antibiotics, as the cancer-killing effect has been shown to be irreversible only at high doses (i.e. 250 μg ml–1 ciprofloxacin) (Zehavi-Willner and Shalit, 1992).
Compared with early studies, we were able to obtain the age at first and last infection and were therefore able to identify that the infection was not likely a result of bladder cancer and, that detection bias could not explain our results. We were also able to exclude subjects reporting a history of diabetes, kidney stones, and bladder stones and therefore eliminate the possibility that the effect of bladder infections could be so explained. Some of our subgroup analyses, especially those conducted among women with specific smoking status or histology, were based on very small numbers; so interpretation must be cautious. We also had power limitations in such groups, as infection before age 20 or after age 49, which would have been potentially interesting with greater numbers. Thus, in order to ensure proper study power, median ages were used as cut-off points. Also, information on antibiotic therapy associated with UTIs and other diseases was not requested. Recall bias (i.e. the possibility that cancer patients were more likely to recall infections than healthy controls) has probably not played an important role, as the associations we observed are inverse. However, confounding may still have resulted from unmeasured socioeconomic, genetic, and other lifestyle factors that differentiate women who had infection from those who did not. Bladder infection may be a marker of a greater susceptibility to all kinds of infections and subsequently a greater likelihood of being prescribed antibiotics. Lastly, bladder cancer patients with a history of infection may be more likely to die, be too ill to be interviewed, or decline participation in our study, thus leading to potential selection bias, which could have explained some of our observed associations.
Our results suggest that a history of bladder infection is associated with a reduced risk of bladder cancer. Cytotoxicity against bladder cancer cells from antibiotics commonly used to treat bladder infections is proposed as a possible mechanism to explain this association.
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References
Alexandroff AB, Jackson AM, O’Donnell MA, James K (1999) BCG immunotherapy of bladder cancer: 20 years on. Lancet 353: 1689–1694
Aranha O, Wood Jr DP, Sarkar FH (2000) Ciprofloxacin mediated cell growth inhibition, S/G2-M cell cycle arrest, and apoptosis in a human transitional cell carcinoma of the bladder cell line. Clin Cancer Res 6: 891–900
Aranha O, Zhu L, Alhasan S, Wood Jr DP, Kuo TH, Sarkar FH (2002) Role of mitochondria in ciprofloxacin induced apoptosis in bladder cancer cells. J Urol 167: 1288–1294
Bernstein L, Ross RK (1991) Cancer in Los Angeles County. University of Southern California: Los Angeles, CA
Burin GJ, Gibb HJ, Hill RN (1995) Human bladder cancer: evidence for a potential irritation-induced mechanism. Food Chem Toxicol 33: 785–795
Castelao JE, Yuan JM, Gago-Dominguez M, Skipper PL, Tannenbaum SR, Chan KK, Watson MA, Bell DA, Coetzee GA, Ross RK, Yu MC (2004) Carotenoids/vitamin C and smoking-related bladder cancer. Int J Cancer 110: 417–423
Castelao JE, Yuan JM, Gago-Dominguez M, Yu MC, Ross RK (2000) Non-steroidal anti-inflammatory drugs and bladder cancer prevention. Br J Cancer 82: 1364–1369
Castelao JE, Yuan JM, Skipper PL, Tannenbaum SR, Gago-Dominguez M, Crowder JS, Ross RK, Yu MC (2001) Gender- and smoking-related bladder cancer risk. J Natl Cancer Inst 93: 538–545
Claude J, Kunze E, Frentzel-Beyme R, Paczkowski K, Schneider J, Schubert H (1986) Life-style and occupational risk factors in cancer of the lower urinary tract. Am J Epidemiol 124: 578–589
Davis CP, Cohen MS, Hackett RL, Anderson MD, Warren MM (1991) Urothelial hyperplasia and neoplasia. III. Detection of nitrosamine production with different bacterial genera in chronic urinary tract infections of rats. J Urol 145: 875–880
Ebisuno S, Inagaki T, Kohjimoto Y, Ohkawa T (1997) The cytotoxic effect of fleroxacin and ciprofloxacin on transitional cell carcinoma in vitro. Cancer 80: 2263–2267
Fihn SD (2003) Clinical practice. Acute uncomplicated urinary tract infection in women. N Engl J Med 349: 259–266
Foxman B, Gillespie B, Koopman J, Zhang L, Palin K, Tallman P, Marsh JV, Spear S, Sobel JD, Marty MJ, Marrs CF (2000) Risk factors for second urinary tract infection among college women. Am J Epidemiol 151: 1194–1205
Gago-Dominguez M, Bell DA, Watson MA, Yuan JM, Castelao JE, Hein DW, Chan KK, Coetzee GA, Ross RK, Yu MC (2003) Permanent hair dyes and bladder cancer: risk modification by cytochrome P4501A2 and N-acetyltransferases 1 and 2. Carcinogenesis 24: 483–489
Gago-Dominguez M, Castelao JE, Yuan JM, Yu MC, Ross RK (2001) Use of permanent hair dyes and bladder-cancer risk. Int J Cancer 91: 575–579
Gonzalez CA, Errezola M, Izarzugaza I, Lopez-Abente G, Escolar A, Nebot M, Riboli E (1991) Urinary infection, renal lithiasis and bladder cancer in Spain. Eur J Cancer 27: 498–500
Howe GR, Burch JD, Miller AB, Cook GM, Esteve J, Morrison B, Gordon P, Chambers LW, Fodor G, Winsor GM (1980) Tobacco use, occupation, coffee, various nutrients, and bladder cancer. J Natl Cancer Inst 64: 701–713
IARC (1994) Infection with schistosomes (Schistosoma haematobium, Schistosoma mansoni and Schistosoma japonicum). IARC Monogr Eval Carcinog Risks Hum 61: 45–119
Jhamb M, Lin J, Ballow R, Kamat AM, Grossman HB, Wu X (2007) Urinary tract diseases and bladder cancer risk: a case-control study. Cancer Causes Control 18: 839–845
Jiang X, Castelao JE, Groshen S, Cortessis VK, Ross RK, Conti DV, Gago-Dominguez M (2007) Alcohol consumption and risk of bladder cancer in Los Angeles County. Int J Cancer 121: 839–845
Jiang X, Castelao JE, Groshen S, Cortessis VK, Shibata DK, Conti DV, Gago-Dominguez M (2008) Water intake and bladder cancer risk in Los Angeles County. Int J Cancer 123: 1649–1656
Kamat AM, Lamm DL (2004) Antitumor activity of common antibiotics against superficial bladder cancer. Urology 63: 457–460
Kantor AF, Hartge P, Hoover RN, Fraumeni Jr JF (1988) Epidemiological characteristics of squamous cell carcinoma and adenocarcinoma of the bladder. Cancer Res 48: 3853–3855
Kantor AF, Hartge P, Hoover RN, Narayana AS, Sullivan JW, Fraumeni Jr JF (1984) Urinary tract infection and risk of bladder cancer. Am J Epidemiol 119: 510–515
Kjaer SK, Knudsen JB, Sorensen BL, Moller Jensen O (1989) The Copenhagen case-control study of bladder cancer. V. Review of the role of urinary-tract infection. Acta Oncol 28: 631–636
La Vecchia C, Negri E, D’Avanzo B, Savoldelli R, Franceschi S (1991) Genital and urinary tract diseases and bladder cancer. Cancer Res 51: 629–631
Masters PA, O’Bryan TA, Zurlo J, Miller DQ, Joshi N (2003) Trimethoprim-sulfamethoxazole revisited. Arch Intern Med 163: 402–410
Michaud DS (2007) Chronic inflammation and bladder cancer. Urol Oncol 25: 260–268
Michaud DS, Platz EA, Giovannucci E (2007) Gonorrhoea and male bladder cancer in a prospective study. Br J Cancer 96: 169–171
Mommsen S, Sell A (1983) Prostatic hypertrophy and venereal disease as possible risk factors in the development of bladder cancer. Urol Res 11: 49–52
Piper JM, Matanoski GM, Tonascia J (1986) Bladder cancer in young women. Am J Epidemiol 123: 1033–1042
Seay TM, Peretsman SJ, Dixon PS (1996) Inhibition of human transitional cell carcinoma in vitro proliferation by fluoroquinolone antibiotics. J Urol 155: 757–762
Sheffield JS, Cunningham FG (2005) Urinary tract infection in women. Obstet Gynecol 106: 1085–1092
Stamm WE (2002) Scientific and clinical challenges in the management of urinary tract infections. Am J Med 113 (Suppl 1A): 1S–4S
Stamm WE, Hooton TM (1993) Management of urinary tract infections in adults. N Engl J Med 329: 1328–1334
Sturgeon SR, Hartge P, Silverman DT, Kantor AF, Linehan WM, Lynch C, Hoover RN (1994) Associations between bladder cancer risk factors and tumor stage and grade at diagnosis. Epidemiology 5: 218–225
Wong ES, Stamm WE (1983) Urethral infections in men and women. Annu Rev Med 34: 337–358
Yu MC, Ross RK (2002) Bladder cancer: epidemiology. In Encyclopedia of Cancer, Bertino JR (ed) 2nd edn, Vol. 1, pp 215–221. Academic Press: San Diego
Zasloff M (2007) Antimicrobial peptides, innate immunity, and the normally sterile urinary tract. J Am Soc Nephrol 18: 2810–2816
Zehavi-Willner T, Shalit I (1992) The inhibitory effect of ciprofloxacin on proliferation of a murine bladder carcinoma cell line. J Antimicrob Chemother 29: 323–328
Acknowledgements
This study was supported by grants from the US National Cancer Institute (grants P01 CA17054, R35 CA53890, R01 CA65726, and R01 CA114665), the US National Institute of Environmental Health Sciences (grants P01 ES05622 and P30 ES07048), the Galician Foundation of Genomic Medicine (CHUS, Galicia, Spain), and the Program of Instituto de Salud Carlos III (CHUVI, Galicia, Spain).
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Jiang, X., Castelao, J., Groshen, S. et al. Urinary tract infections and reduced risk of bladder cancer in Los Angeles. Br J Cancer 100, 834–839 (2009). https://doi.org/10.1038/sj.bjc.6604889
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DOI: https://doi.org/10.1038/sj.bjc.6604889
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