Endometriosis, Psoriasis, and Psoriatic Arthritis: A Prospective Cohort Study.

Endometriosis, psoriasis, and psoriatic arthritis (PsA) are chronic inflammatory disorders whose etiologies remain poorly understood but may be correlated, as endometriosis has been associated with other inflammatory disorders. We investigated the bidirectional associations between laparoscopically confirmed endometriosis and physician-diagnosed psoriasis and PsA in the Nurses' Health Study II cohort (n = 116,429, United States, 1991-2013). We confirmed 4,112 incident cases of laparoscopically confirmed endometriosis (mean age at diagnosis = 40.3 years) and 697 validated physician-diagnosed cases of psoriasis (mean age at diagnosis = 43.6 years), 110 of which presented with concomitant PsA. A history of psoriasis with concomitant PsA was associated with a 2-fold higher risk of endometriosis (hazard ratio (HR) = 2.01, 95% CI: 1.23, 3.30); however, no association was observed between psoriasis without PsA and endometriosis risk (HR = 0.93, 95% CI: 0.68, 1.26). When endometriosis was the exposure, it was not associated with a risk of subsequent psoriasis (HR = 1.28, 95% CI: 0.95, 1.72). The risk of psoriasis with PsA was notably higher; however, the sample size was small and the confidence intervals wide (HR = 1.77, 95% CI: 0.89, 3.52). Our findings suggest that psoriasis with concomitant PsA is associated with greater risk of laparoscopically confirmed endometriosis. In addition, there was a suggestive association between endometriosis diagnosis and subsequent risk of psoriasis with PsA.

COX-2 inhibitors show no preventive effect in the development of skin cancer.

BACKGROUND: Some clinical trials found that cyclooxygenase-2 (COX-2) inhibitor use lowered the risk of skin cancer in high-risk groups. PATIENTS AND METHODS: To determine whether COX-2 inhibitor use is associated with lower risk of basal cell carcinoma (BCC), cutaneous squamous cell carcinoma (cSCC), and melanoma, we analyzed COX-2 inhibitor use and risk of skin cancer based on three prospective cohort studies, the Nurses' Health Study (NHS), NHS II, and the Health Professionals Follow-up Study, including 153,882 participants. Multivariable hazard ratios (HRs) and 95 % confidence intervals (CIs) for the association of COX-2 inhibitor use with risk of BCC, cSCC, and melanoma were estimated using Cox proportional hazards models. We pooled the results using a fixed effects model. RESULTS: 16,142 BCC, 1,973 cSCC, and 631 melanoma cases were documented. Ever vs. never use of COX-2 inhibitor was associated with a modestly increased risk of BCC (multivariable HR 1.09, 95 % CI 1.05-1.14). The hazard ratio was similar for cSCC (multivariable HR 1.12, 95 % CI 1.00-1.27) and melanoma (multivariable HR 1.10, 95 % CI 0.89-1.38), but was not statistically significant. CONCLUSIONS: Ever use of COX-2 inhibitor was not associated with a decreased skin cancer risk but was instead associated with a modest, increased risk of BCC.

Eye color and the risk of skin cancer.

Melanoma, basal cell carcinoma (BCC) and squamous cell carcinoma (SCC) are the most common skin cancers. The incidence rates of all three types of skin cancers have increased in the past three decades. Light pigmentary traits have been recognized as one of the host risk factors for skin cancer, but findings on associations between eye colors and risk of skin cancers have been inconsistent.We performed a prospective analysis to examine the association between eye colors and risk of skin cancers using the Health Professionals Follow-up Study (HPFS). Cox proportional hazard models were applied to estimate relative risks (RRs) and their 95% confidence intervals (CIs). Effect modifications due to hair color and skin reaction to sun were also examined.The HPFS included 35,662 males. During a median follow-up of 19 years (1988-2012), 445 melanoma, 1123 SCC, and 7198 BCC cases were documented. Compared to those whose eye colors were dark or brown, participants with hazel/green/medium and blue/light colors had a 24% (RR = 1.24, 95% CI: 1.06-1.45) and a 19% (RR = 1.19, 95% CI: 1.01-1.41) higher risk of SCC, respectively. Similarly, a higher risk of BCC was observed in participants with hazel/green/medium eye colors (RR = 1.16, 95% CI: 1.09-1.23) and blue/light eye colors (RR = 1.17, 95% CI: 1.10-1.25). We did not find significant associations between eye color and risk of melanoma. Lighter eye color was associated with increased risks of SCC and BCC among those with dark hair colors (p for interaction ≤ 0.02).In conclusion, in this large prospective study of men, we found that light eye colors were associated with higher risks of SCC and BCC, but not melanoma. Further studies are needed to confirm this association in other populations.

A Systematic Review of Diet Quality Index and Obesity among Chinese Adults.

Diet quality scores are designed mainly based on Western-style dietary patterns. They were demonstrated to be good indicators of obesity in developed but not developing countries. Several diet quality scores were developed based on the Chinese dietary guidelines, yet no systematic review exists regarding how they were related to obesity. We searched research articles published between 2000 and 2021 in PubMed, CINAHL, and Scopus databases. Both cross-sectional and prospective studies that examined the relationship between a diet quality score and weight, body mass index, obesity, or waist circumference conducted in a Chinese population were selected. From the 602 articles searched, 20 articles were selected (12 are cross-sectional studies and 8 are prospective cohort studies). The relationship between internationally used scores and obesity was inconsistent among studies. Scores tailored to the Chinese diet demonstrated a strong relationship with both being underweight and obesity. The heterogeneity of the populations and the major nutrition transition in China may partially explain the discrepancies among studies. In conclusion, diet quality scores tailored to the Chinese diet may be associated with both undernutrition and overnutrition, as well as being underweight and obesity outcomes.

A description of treatment patterns of psoriasis by medical providers and disease severity in US women.

BACKGROUND: Studies on treatment patterns of psoriasis are valuable to evaluate how efficiently individuals with psoriasis are treated and may facilitate improved outcomes for these patients. OBJECTIVE: To describe treatment patterns of psoriasis among US women. METHODS: In the Nurses' Health Study II (NHS II), a prospective study of female nurses, 2107 women reported to have a diagnosis of psoriasis made by a clinician. We sent them the Psoriasis Screening Tool-2, a validated diagnostic tool for psoriasis, which queries age at diagnosis, treatments, type of psoriasis lesions, body surface area involved, and the provider who made the diagnosis. RESULTS: A total of 1382 women completed and returned the survey, with 1243 of them validated for having psoriasis. 30% of the patients were diagnosed by non-dermatologists. 79% of the patients reported mild, 17% moderate and 4% severe disease. Psoriasis phenotypes were as follows: plaque 41%, scalp 49%, inverse 27%, nail 22% and palmoplantar 15%. Treatment patterns for mild psoriasis were as follows: only topical treatment 58%, systemic therapy and/or phototherapy 16% and no treatment 26%. Treatment patterns for moderate-to-severe disease were as follows: only topical treatment 42%, systemic therapy and/or phototherapy 47% and no treatment 11%. CONCLUSION: The majority of women in NHS II with psoriasis have mild disease. A large proportion of psoriasis patients were diagnosed by non-dermatologists. More than half of people with moderate-to-severe disease received no treatment or only topical medications. A considerable percentage of people with psoriasis reported phenotypes other than chronic plaque psoriasis.

Gluten intake and risk of psoriasis, psoriatic arthritis, and atopic dermatitis among United States women.

BACKGROUND: Associations between gluten intake and psoriasis, psoriatic arthritis, and atopic dermatitis are poorly understood. OBJECTIVE: To determine whether increased gluten intake is associated with incident psoriasis, psoriatic arthritis, and atopic dermatitis. METHODS: Cohort studies among women in Nurses' Health Study II. Food frequency questionnaires were used to calculate gluten content of participants' diet every 4 years (1991-2015 for psoriatic disease, 1995-2013 for atopic dermatitis). Disease outcomes were assessed by self-report and subsequently validated. Multivariable-adjusted Cox proportional hazards models were used to calculate hazard ratios and 95% confidence intervals for the association between gluten intake (quintiles) and psoriasis, psoriatic arthritis, and atopic dermatitis. RESULTS: We included 85,185 participants in the psoriasis analysis, 85,324 in the psoriatic arthritis analysis, and 63,443 in the atopic dermatitis analysis. Increased gluten intake was not associated with any of the outcomes (all P for trend >.05). Comparing highest and lowest gluten intake quintiles, the multivariable hazard ratios (95% confidence intervals) were 1.15 (0.98-1.36) for psoriasis, 1.12 (0.78-1.62) for psoriatic arthritis, and 0.91 (0.66-1.25) for atopic dermatitis. LIMITATIONS: No assessment of a strictly gluten-free diet. CONCLUSIONS: Our findings do not support the amount of dietary gluten intake as a risk factor for psoriasis, psoriatic arthritis, or atopic dermatitis in adult women.

Meat intake and risk of hepatocellular carcinoma in two large US prospective cohorts of women and men.

BACKGROUND: Epidemiological evidence on the associations between meat intake and risk of hepatocellular carcinoma (HCC) was limited and inconsistent. METHODS: We prospectively examined the association between consumption of meats and meat mutagens with HCC risk using data from the Nurses' Health Study and the Health Professionals Follow-up Study. Cox proportional-hazards regression models were used to calculate hazard ratios (HRs) and 95% confidence intervals (CIs) after adjusting for known liver-cancer risk factors. RESULTS: During up to 32 years of follow-up, we documented 163 incident HCC cases. The HRs of HCC for the highest vs the lowest tertile intake levels were 1.84 (95% CI: 1.16-2.92, Ptrend = 0.04) for processed red meats and 0.61 (95% CI: 0.40-0.91, Ptrend = 0.02) for total white meats. There was a null association between unprocessed red meats and HCC risk (HR = 1.06, 95% CI: 0.68-1.63, Ptrend = 0.85). We found both poultry (HR = 0.60, 95% CI: 0.40-0.90, Ptrend = 0.01) and fish (HR = 0.70, 95% CI: 0.47-1.05, Ptrend = 0.10) were inversely associated with HCC risk. The HR for HCC risk was 0.79 (95% CI: 0.61-1.02) when 1 standard deviation of processed red meats was substituted with an equivalent amount of poultry or fish intake. We also found a suggestive positive association of intake of meat-derived mutagenicity or heterocyclic amines with risk of HCC. CONCLUSIONS: Processed red meat intake might be associated with higher, whereas poultry or possibly fish intake might be associated with lower, risk of HCC. Replacing processed red meat with poultry or fish might be associated with reduced HCC risk.

A Prospective Study of Toenail Trace Element Levels and Risk of Skin Cancer.

BACKGROUND: Few epidemiologic studies have investigated trace element exposure and skin cancer risk. METHODS: Toenail levels of mercury, selenium, chromium, iron, and zinc were measured from 6,708 women in the Nurses' Health Study (1984-2012) and 3,730 men in the Health Professionals Follow-up Study (1986-2012) with data from prior nested case-control studies. Participants were free of skin cancer at toenail collection and followed for incident basal cell carcinoma (BCC), squamous cell carcinoma (SCC), and melanoma. Cox proportional hazards models were used to compute hazard ratios (HR) and 95% confidence intervals (CI) of skin cancer associated with the elements in each study. We calculated pooled multivariable HRs using a fixed-effects model. During 26 to 28 years of follow-up, 2,433 BCC, 334 SCC, and 130 melanoma cases were documented. RESULTS: Higher toenail mercury levels were associated with risk of BCC [pooled HR for top vs. bottom quintiles = 1.34 (95% CI, 1.18-1.52), P trend < 0.0001]. Similar direct associations were found with risks of SCC [pooled HR for top vs. bottom quartiles = 1.41 (95% CI, 1.03-1.94), P trend = 0.04] and melanoma [pooled HR for top vs. bottom quartiles = 1.88 (95% CI, 1.12-3.16), P trend = 0.02]. Chromium was positively associated with BCC in women only. No associations were found between other metals and skin cancer risk. CONCLUSIONS: Our prospective data found that increased toenail mercury concentrations were associated with increased skin cancer risk. IMPACT: If our novel findings are confirmed, mercury may play a role in skin carcinogenesis.

A Prospective Study of Nut Consumption and Risk of Primary Hepatocellular Carcinoma in the U.S. Women and Men.

Although increasing evidence suggests a potential beneficial effect of nut consumption on various diseases, no epidemiologic study has yet examined the association between nut consumption and risk of hepatocellular carcinoma (HCC). We prospectively examined this association in 88,783 women from the Nurses' Health Study and 51,492 men from the Health Professionals Follow-up Study. Nut consumption was assessed every 4 years using validated food frequency questionnaires. Multivariable HRs and 95% confidence intervals (95% CI) were estimated using Cox proportional hazards regression models after adjusting for HCC risk factors. After an average of 27.9 years of follow-up, we identified a total of 162 incident HCC cases. Higher total nut consumption was not significantly associated with HCC risk (the highest vs. lowest tertile intake, HR, 0.84; 95% CI, 0.56-1.26). For the same comparison, higher tree nut consumption was associated with a lower HCC risk (HR, 0.64; 95% CI, 0.43-0.95). We found nonsignificant inverse associations with consumption of walnuts, peanuts, and peanut butter. Overall, nut consumption was not strongly associated with HCC risk. There was a suggestive inverse association with tree nut consumption. Future studies should carefully consider hepatitis B or C virus infections and examine these associations in other racial/ethnic groups.

Inflammatory dietary pattern and incident psoriasis, psoriatic arthritis, and atopic dermatitis in women: A cohort study.

BACKGROUND: Diet is a modulator of inflammation that might impact inflammatory skin diseases. OBJECTIVE: To assess the relationship between pro-inflammatory dietary patterns and incident psoriasis, psoriatic arthritis (PsA), and atopic dermatitis (AD). METHODS: We conducted cohort studies among women in the Nurses' Health Study II. The Empirical Dietary Inflammatory Pattern (EDIP) score was calculated at baseline and every 4 years. Incident psoriasis, PsA, and AD were assessed by validated self-report. We used multivariable-adjusted Cox proportional hazards models to calculate hazard ratios (HRs) and 95% confidence intervals (CIs) for the association between EDIP quintiles and risk for psoriasis, PsA, and AD. RESULTS: We had 85,185 participants in the psoriasis analysis and 63,443 in the AD analysis. There were 1432 cases of psoriasis, 262 cases of PsA, and 403 cases of AD. Pro-inflammatory dietary patterns were not associated with the risk for outcomes in multivariable models (all P values for trend >.05). HRs comparing the highest to the lowest EDIP quintile were 0.99 (95% CI 0.83-1.18) for psoriasis, 1.22 (95% CI 0.81-1.83) for PsA, and 0.96 (95% CI 0.69-1.34) for AD. LIMITATIONS: Recall and self-report. CONCLUSION: Our findings do not support dietary inflammatory potential as a risk factor for psoriasis, PsA, or AD.

Association Between Health Maintenance Practices and Skin Cancer Risk as a Possible Source of Detection Bias.

Importance: Detection bias may influence the results of epidemiologic studies of skin cancer risk. An individual's degree of contact with the health care system, and, specifically, undergoing routine screening practices, may be a source of such bias. More intensive screening practices may be associated with increased diagnoses of basal cell carcinoma (BCC), squamous cell carcinoma (SCC), and melanoma. Objective: To assess a possible association between health care screening practices and skin cancer risk. Design, Setting, and Participants: The cohort of participants for this study was drawn from the Nurses' Health Study (121 700 women) and Health Professionals Follow-up Study (51 529 men). Participants in the Nurses' Health Study were followed up from June 1, 1990, to June 1, 2012, and participants in the Health Professionals Follow-up Study were followed up from January 1, 1990, to January 1, 2012. Statistical analysis was performed from April 4, 2017, to May 16, 2018. Exposures: During cohort follow-up, Nurses' Health Study and Health Professionals Follow-up Study participants were asked whether they had undergone various health care screening practices including physical examination by a physician, sigmoidoscopy or colonoscopy, eye examination, serum cholesterol test, mammography, breast examination and pelvic examination, and prostate-specific antigen test and rectal examination. Main Outcomes and Measures: Incident BCC, SCC, and invasive melanoma. Cases of SCC and melanoma were confirmed with histopathologic findings. Hazard ratios (HRs) with 95% CIs were calculated for the association between screening practices and the various types of skin cancer. Results: This study included 77 736 women from the Nurses' Health Study (mean [SD] age at baseline, 56 [7] years) who were followed up for 1 388 523 person-years and 39 756 men from the Health Professionals Follow-up Study (mean [SD] age at baseline, 58 [10] years) who were followed up for 635 319 person-years. A total of 14 319 incident BCCs, 1517 SCCs, and 506 melanomas were identified in the Nurses' Health Study cohort and 8741 incident BCCs, 1191 SCCs, and 469 melanomas were identified in the Health Professionals Follow-up Study cohort. Positive associations were seen between various screening practices and diagnoses of BCC and SCC, with similar directions of associations seen with melanoma for some screening practices. In the Nurses' Health Study, the multivariable HR associated with undergoing a physical examination was 1.46 (95% CI, 1.30-1.64) for BCC, 2.32 (95% CI, 1.41-3.80) for SCC, and 1.66 (95% CI, 0.85-3.22) for melanoma. Similar results were seen in the Health Professionals Follow-up Study, with a multivariable HR associated with undergoing a physical examination of 1.43 (95% CI, 1.26-1.63) for BCC and 1.85 (95% CI, 1.17-2.92) for SCC, with an attenuated HR for melanoma of 1.04 (95% CI, 0.64-1.69). Conclusions and Relevance: Undergoing health care screening practices increases the likelihood of being diagnosed with skin cancer. Researchers should be aware of this association and, where appropriate and possible, condition analyses of skin cancer risk on measures of health care use, including screening, to address confounding associated with detection bias.

Intake of folate and other nutrients related to one-carbon metabolism and risk of cutaneous melanoma among US women and men.

BACKGROUND: Nutrients involved in one-carbon metabolism - folate, vitamins B6 and B12, methionine, choline, and betaine - have been inversely associated with multiple cancer sites and may be related to skin cancer. However, there is a lack of research on the association between intake of these nutrients and cutaneous melanoma risk. The aim of this study was to examine the associations between intake of one-carbon metabolism nutrients and cutaneous melanoma risk in two large prospective cohorts. METHODS: The cohorts included 75,311 white women and 48,523 white men. Nutrient intake was assessed repeatedly by food frequency questionnaires and self-reported supplement use. We used Cox proportional hazards regression to estimate multivariable-adjusted hazard ratios (HRs) and 95% confidence intervals (CIs) and then pooled HRs using a random-effects model. RESULTS: Over 24-26 years of follow-up, we documented 1328 melanoma cases (648 men and 680 women). Higher intake of folate from food only, but not total folate, was associated with increased melanoma risk (pooled HR for top versus bottom quintile: 1.36; 95% CI: 1.13-1.64; P for trend = 0.001). The association was significant in men, but attenuated in women. Higher intake of vitamins B6 and B12, choline, betaine, and methionine were not associated with melanoma risk, although there was modest increasing trend of risk for vitamin B6 from food only (pooled HR for top versus bottom quintile: 1.18; 95% CI: 0.99-1.41; P for trend = 0.03). CONCLUSIONS: We found some evidence that higher intake of folate from food only was associated with a modest increased risk of cutaneous melanoma. However, since other factors related to dietary folate intake may account for the observed association, our findings warrant further investigation.

Red meat and processed meat intake and risk for cutaneous melanoma in white women and men: Two prospective cohort studies.

BACKGROUND: Red and processed meat consumption has been associated with increased risk for several cancers, but the association with cutaneous melanoma risk has been inconclusive. OBJECTIVE: To investigate the association between red and processed meat intake and melanoma risk. METHODS: Dietary information was assessed by using food frequency questionnaires in 2 prospective cohorts: 75,263 women from the Nurses' Health Study (1984-2010) and 48,523 men from the Health Professionals Follow-up Study (1986-2010). Melanoma cases were confirmed by reviewing pathology records. Pooled multivariable hazard ratios and 95% confidence intervals were estimated by using Cox proportional hazards models. RESULTS: A total of 679 female and 639 male melanoma cases were documented during follow-up. Red and processed meat intake was inversely associated with melanoma risk (P = .002 for trend); the pooled hazard ratios (95% confidence intervals) of the 2 cohorts were 1.00 (reference), 1.00 (0.87-1.14), 0.98 (0.86-1.13), 0.89 (0.77-1.02), and 0.81 (0.70-0.95) for increasing quintiles of intake. LIMITATIONS: Findings might have limited generalizability, considering that the cohorts were limited to white health professionals. CONCLUSION: Red and processed meat intake was inversely associated with melanoma risk in these 2 cohorts.