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1.
PEC Innov ; 3: 100232, 2023 Dec 15.
Article En | MEDLINE | ID: mdl-38028436

Objective: To explore factors associated with communication and information-seeking after receipt of skin cancer prevention information among Hispanic individuals. Methods: Multivariable logistic regression was used to analyze existing data on demographics, personal experience, salience, and beliefs variables collected from Hispanic individuals to determine independent associations with sharing and seeking information about skin cancer prevention. Results: Of 578 participants, 53% reported any communication about skin cancer prevention behaviors or skin cancer genetic risk; and 31% and 21% sought additional information about preventive behaviors or genetic risk, respectively. Female sex, greater perceived severity, higher comparative chance of getting skin cancer, and lower health literacy were associated with greater communication, while having no idea of one's own skin cancer risk was related to less communication. Greater health numeracy and higher cancer worry were associated with information-seeking about prevention behaviors and genetic risk. Conclusion: Up to half of participants reported communication or information-seeking, although factors associated with specific activities differed. Future studies should evaluate how to promote communication behaviors in the Hispanic community and how sharing and seeking information influence an individual's network prevention practices. Innovation: Several factors related to communication behaviors among Hispanic people after obtaining skin cancer prevention information were identified.Trial registration: This trial was registered on clinicaltrials.gov (NCT03509467).

2.
BMC Public Health ; 23(1): 2234, 2023 11 13.
Article En | MEDLINE | ID: mdl-37957686

BACKGROUND: Incidence of skin cancer has been increasing among U.S. Hispanics, who often are diagnosed with larger lesions and at later stage disease. Behaviors to decrease exposure to ultraviolet radiation can reduce risk of skin cancer. We describe skin cancer prevention behaviors and psychosocial variables among Hispanic participants recruited into a skin cancer prevention trial. METHODS: Self-reported Hispanic participants from eight primary care clinics in Tampa, Florida and Ponce, Puerto Rico were recruited into a randomized controlled prevention trial. Information on demographics, sun-related behaviors, and psychosocial variables were collected before intervention materials were provided. Multivariable regression models were used to compare baseline sun-related behaviors and psychosocial variables across groups defined by geographic location and language preference. RESULTS: Participants reported low levels of intentional outdoor tanning, weekday and weekend sun exposure, and very low levels of indoor tanning. However, only a minority of participants practiced sun-protective behaviors often or always, and about 30% experienced a sunburn in the past year. Participants had low levels of recent worry and concern about skin cancer, modest levels of perceived risk and severity, and high levels of response efficacy and self-efficacy. When comparing across groups defined by geographic location and language preference, English-preferring Tampa residents (hereafter referred to as Tampeños) had the highest proportion who were sunburned (35.9%) and tended toward more risky behavior but also had higher protective behavior than did Spanish-preferring Tampeños or Puerto Ricans. Spanish-preferring Puerto Ricans had higher recent concern about skin cancer, comparative chance of getting skin cancer, and response efficacy compared to either English- or Spanish-preferring Tampeños. Spanish-preferring Tampeños had the highest levels of familism and recent distress about skin cancer. CONCLUSIONS: Our results mirror previous observations of low levels of sun-protective behavior among U.S. Hispanics compelling the need for culturally appropriate and translated awareness campaigns targeted to this population. Because Hispanics in Tampa and Puerto Rico reported modest levels of perceived risk and severity, and high levels of response efficacy and self-efficacy, interventions aiming to improve skin cancer prevention activities that are anchored in Protection Motivation Theory may be particularly effective in this population subgroup.


Skin Neoplasms , Sunburn , Humans , Puerto Rico/epidemiology , Florida/epidemiology , Ultraviolet Rays , Health Behavior , Skin Neoplasms/prevention & control , Skin Neoplasms/etiology , Sunburn/prevention & control , Hispanic or Latino/psychology
3.
Patient Educ Couns ; 117: 107978, 2023 12.
Article En | MEDLINE | ID: mdl-37708699

OBJECTIVE: To identify predictors of genetic risk recall and examine whether recall influences adoption of skin cancer preventive behaviors among Hispanic individuals. METHODS: Hispanic participants randomized to intervention arms (n = 463) of a precision prevention trial were provided MC1R risk information (average, higher) and asked to recall their risk after 3 and 9 months. Predictors of recall (correct versus did not recall/misremembered) were determined by backwards stepwise logistic regression. Intervention effects on preventive behaviors were estimated within strata of 3-month recall. RESULTS: Age inversely predicted correct recall in both risk groups (average: OR3-months(3)= 0.97, 95%CI:0.94-1.01, OR9-months(9)= 0.96, 95%CI:0.93-0.99; higher: OR3 = 0.98, 95%CI:0.95-1.01, OR9 = 0.98, 95%CI:0.95-1.00). Education positively predicted recall among participants at average risk (OR3 =1.64, 95%CI:1.06-2.63, OR9 =1.73, 95%CI:1.12-2.81). Darker untanned skin color inversely predicted recall among participants at higher risk (OR3 =0.68, 95%CI:0.45-0.99, OR9 =0.74, 95%CI:0.50-1.09). Intervention effects for routine sunscreen use and undergoing a clinical skin exam were stronger among participants at higher risk who correctly recalled at 3 months than those who did not recall/misremembered. CONCLUSIONS: Younger age, higher education, and lighter untanned skin color predicted correct recall. Better recall may improve skin cancer prevention outcomes. PRACTICE IMPLICATIONS: Additional strategies are needed to boost recall among Hispanic individuals who are older, less educated, and darker-skinned.


Hispanic or Latino , Skin Neoplasms , Humans , Florida , Puerto Rico , Risk Factors , Skin Neoplasms/genetics , Skin Neoplasms/prevention & control
4.
Patient Educ Couns ; 112: 107742, 2023 07.
Article En | MEDLINE | ID: mdl-37028174

OBJECTIVE: Examine retention and evaluation of incorporating melanocortin-1 receptor genetic risk information materials in a skin cancer prevention intervention conducted in Hispanics living near Tampa, Florida and Ponce, Puerto Rico. METHODS: Two researchers applied thematic content analysis to identify major themes of open-ended responses (n = 1689) from 489 participants. RESULTS: Five major thematic categories emerged: 1) intervention comments; 2) tips and tricks; 3) cancer prevention; 4) general information; and 5) risk factors and genetics. Responses captured under intervention comments (e.g., information was clear, easy to understand) and tips and tricks for sun protection (e.g., using sunscreen, wearing protective clothing) were most frequent. Participants noted the importance of conducting skin exams professionally or at home. English-preferring Tampa residents stated their individual risk factors, especially race and/or ethnicity, more frequently than Ponce residents and Spanish-preferring Tampa residents. Ponce residents were more likely to comment on wanting to share intervention materials with family and friends. CONCLUSION: Findings suggest Hispanic participants implemented sun safety activities.


Skin Neoplasms , Sunscreening Agents , Humans , Health Behavior , Hispanic or Latino , Risk Factors , Skin Neoplasms/prevention & control , Sunscreening Agents/therapeutic use
5.
Genet Med ; 25(4): 100005, 2023 04.
Article En | MEDLINE | ID: mdl-36629029

PURPOSE: Inherited variation in MC1R imparts low to moderate risk of melanoma. Research on genetic risk recall, factors predicting recall, and whether recall influences adoption of preventive behaviors is limited. METHODS: Participants (n = 447) enrolled in a melanoma precision prevention trial were provided with MC1R risk information (average or higher) and after 6 and 12 months, were asked to recall their genetic risk. Predictors of recall were identified using backward stepwise selection. Intervention effects were reassessed after stratifying by recall. RESULTS: Participants at higher risk were 2 to 3 times more likely to misremember or not recall than participants with average risk. Misremembering was almost exclusively observed among participants at higher risk. Among the participants with average risk, lower health numeracy and not completing the telephone follow-up were associated with not recalling or misremembering. Among the participants at higher risk, lower education was associated with not recalling and lower perceived comparative chance of developing melanoma was associated with misremembering. In general, participants at higher risk who correctly recalled had modestly stronger intervention effects on sun protection behaviors than those who misremembered or did not recall. CONCLUSION: Future studies should examine different strategies to increase genetic risk recall, which may result in improved behavioral outcomes, especially among participants with lower education and health numeracy.


Melanoma , Humans , Melanoma/genetics , Melanoma/prevention & control , Risk Factors
6.
Patient Educ Couns ; 105(10): 3143-3150, 2022 10.
Article En | MEDLINE | ID: mdl-35778318

OBJECTIVE: To assess Hispanic participants' ratings of intervention materials and examine differences by language preference. METHODS: Participants on a skin cancer prevention trial were randomized to receive generic (n = 457) or precision prevention materials conveying average (n = 195) or higher genetic risk (n = 268) based on MC1R genotype. Three months after receiving either English or Spanish language prevention materials, participants reported amount read, believability and clarity of materials, and intention to change preventive behavior. RESULTS: Participants reported high levels on all four outcomes, but the precision prevention groups noted lower clarity than the generic group (p = 3.2 ×10-6). Participants preferring Spanish provided consistently higher scores than those preferring English. Among English-preferring participants, those in the precision prevention groups scored lower on all measures than those in the generic group. CONCLUSIONS: Skin cancer prevention materials were well-received by Hispanic participants. Higher scores among participants preferring Spanish may indicate acquiescence bias, or that translated prevention materials met their linguistic needs. Participants in the precision prevention groups with English language preference may have challenges in the uptake of genetic risk results. PRACTICE IMPLICATIONS: Availability of Spanish materials may have facilitated higher scores. Additional strategies should be explored to optimize participants' believability and clarity of precision prevention materials.


Hispanic or Latino , Skin Neoplasms , Florida , Humans , Language , Puerto Rico , Skin Neoplasms/genetics , Skin Neoplasms/prevention & control
7.
Cancer Res Commun ; 2(1): 28-38, 2022 01.
Article En | MEDLINE | ID: mdl-35845857

Purpose: Skin cancer incidence is increasing among Hispanics, who experience worse outcomes than non-Hispanic Whites. Precision prevention incorporating genetic testing for MC1R, a skin cancer susceptibility marker, may improve prevention behavior. Patients and Methods: Hispanic participants (n=920) from Tampa, FL and Ponce, PR, were block-randomized within MC1R higher- and average-risk groups to precision prevention or generic prevention arms. We collected baseline information on demographics, family history of cancer, phenotypic characteristics, health literacy, health numeracy, and psychosocial measures. Participants reported weekday and weekend sun exposure (in hours), number of sunburns, frequency of five sun protection behaviors, intentional outdoor and indoor tanning, and skin examinations at baseline, three months, and nine months. Participants also reported these outcomes for their eldest child ≤10 years old. Results: Among MC1R higher-risk participants, precision prevention increased sunscreen use (OR=1.74, p=0.03) and receipt of a clinical skin exam (OR=6.51, p=0.0006); and it decreased weekday sun exposure hours (ß=-0.94, p=0.005) and improved sun protection behaviors (ß=0.93, p=0.02) in their children. There were no significant intervention effects among MC1R average risk participants. The intervention did not elevate participant cancer worry. We also identified moderators of the intervention effect among both average- and higher-risk participants. Conclusions: Receipt of MC1R precision prevention materials improved some skin cancer prevention behaviors among higher-risk participants and their children and did not result in reduced prevention activities among average-risk participants. Despite these encouraging findings, levels of sun protection behaviors remained suboptimal among participants, warranting more awareness and prevention campaigns targeted to Hispanics.


Skin Neoplasms , Sunburn , Child , Humans , Health Behavior , Skin Neoplasms/genetics , Sunburn/prevention & control , Sunscreening Agents/therapeutic use , Risk Factors
8.
Cancer Prev Res (Phila) ; 15(8): 533-542, 2022 08 01.
Article En | MEDLINE | ID: mdl-35665800

A randomized trial was conducted to examine whether providing precision prevention materials incorporating melanocortin-1 receptor genetic risk information would increase intention to practice melanoma preventive behaviors. Here, we determine retention/evaluation of prevention materials for adolescent and young adults (AYA) 18 to 39 years old versus adults aged 40+ at 6 and 12 months as an a priori adjunct analysis to the primary research question. Using qualitative methodology, open-ended questions probing most important information from prevention materials and additional comments were collected at 6 and 12 months after baseline. Descriptive statistics were performed on demographic/self-reported characteristics. Two independent researchers applied qualitative thematic content analysis to identify major themes in open-ended questions. Of the 1,134 participants randomized, 906 completed at least one of the follow-up surveys and contributed to analyses of intervention efficacy. Five major thematic categories emerged from the open-ended response data: (i) tips and tricks for sun protection; (ii) cancer prevention; (iii) risk factors and genetics; (iv) general information; and (v) intervention comments. Across all ages, the most important information retained were sun protection techniques in the generic prevention materials group and identifying the importance of genetic risk factors/implementing lifestyle behavior changes in the precision prevention materials group. For additional comments, AYA participants in the generic prevention materials group preferred more scientific information including statistics and citations for references while adults were more likely to state they already knew cancer prevention techniques. Results provide unique qualitative evaluation of AYA versus adult retention of prevention materials for melanoma that enhance quantitative findings. PREVENTION RELEVANCE: It is important to evaluate information within groups defined by periods of the life trajectory, e.g., AYA and adults, to best inform preferences, knowledge, and motivation for behavior change. By assessing retention, evidence-based interventions can be designed to better support public health messaging and encourage positive health behaviors.


Melanoma , Adolescent , Adult , Health Behavior , Humans , Melanoma/genetics , Melanoma/prevention & control , Qualitative Research , Risk Factors , Surveys and Questionnaires , Young Adult
9.
Transl Behav Med ; 12(5): 683-687, 2022 05 26.
Article En | MEDLINE | ID: mdl-35552458

Few studies have examined cognitive responses to mailed precision prevention materials. MC1R is a robust, well-described melanoma susceptibility marker. The purpose was to assess cognitive responses to generic or precision prevention materials incorporating MC1R genetic risk. Non-Hispanic White participants (n = 1134) enrolled in a randomized controlled trial received either precision prevention materials incorporating MC1R genetic risk (higher/average) or generic prevention (standard) materials. Six months after baseline, 808 (71.3%) participants reported on the amount of prevention materials read (5-point scale); believability and clarity of materials; intention to change preventive behaviors (7-point Likert scale); and recall of their MC1R genetic risk. Comparisons were conducted using Kruskal-Wallis and chi-squared tests. Overall, participants read most to all (Mdn = 4, IQR = 2) of the prevention materials, reported high believability (Mdn = 7, IQR = 1) and clarity (Mdn = 7, IQR = 1), and moderate intention to change preventive behaviors (Mdn = 5, IQR = 2). Higher-risk participants reported slightly less clarity (Mdn = 6, IQR = 2) than either average-risk (Mdn = 6, IQR = 1, p = 2.50 × 10-3) or standard participants (Mdn = 7, IQR = 1, p = 2.30 × 10-5); and slightly less believability (Mdn = 6, IQR = 1) than standard participants (Mdn = 7, IQR = 1, p = .005). Higher-risk participants were 2.21 times as likely (95% CI = 1.43-3.43) to misremember or forget their risk compared to average-risk participants; misremembering was observed only among higher-risk participants (14%). Mailed precision prevention information were mostly read, highly believable and clear, and resulted in moderate levels of intention to change sun protection behaviors, bolstering the feasibility of population-level precision prevention. Defensive reactions may explain lower clarity, believability, and higher incorrect risk recall among higher-risk participants.


Precision prevention uses an individual's genetics, environment, and/or lifestyle to promote prevention behaviors. However, if materials incorporating precision prevention information are not easily accessible, individuals may misinterpret or distrust findings. Few studies have examined participant-reported believability and clarity of mailed precision prevention materials, how much they read, and whether they intend to change preventive behaviors. We assessed genetic risk for melanoma by determining DNA variation at the MC1R gene, a known melanoma risk marker. Participants were mailed either precision prevention materials conveying their MC1R genetic risk or generic (without genetic risk information) prevention materials. Overall, participants read most of the materials, gave high believability and clarity scores, and reported moderate levels of intention to change preventive behavior. However, participants at higher genetic risk had slightly lower believability and clarity scores than the generic group and were more likely to forget or misremember their genetic risk than participants at average genetic risk. Among participants who correctly recalled their genetic risk, differences in believability diminished, while differences in clarity remained. We conclude that precision prevention materials are highly believable and clear, but additional strategies may be necessary to maximize believability, clarity, and risk recall for individuals at a higher genetic risk.


Melanoma , Receptor, Melanocortin, Type 1/genetics , Humans , Intention , Melanoma/genetics , Melanoma/prevention & control , Risk Factors
10.
Cancers (Basel) ; 13(13)2021 Jun 23.
Article En | MEDLINE | ID: mdl-34201795

Inherited variation at MC1R is associated with elevated melanoma risk among non-Hispanic whites (NHWs). MC1R genetic testing may unmask previously unrecognized disease risk, especially among individuals with few melanoma phenotypic risk factors. We recruited NHW individuals with limited phenotypic risk factors from two primary care clinics in west-central Florida. Participants (n = 1134) were randomized within MC1R genotype risk group (average/higher) to receive mailed precision prevention (i.e., intervention) or generic prevention materials. Participants reported hours of weekday and weekend sun exposure, frequency of intentional outdoor tanning and sun protection behaviors, number of sunburns, indoor tanning episodes, and skin examinations at baseline, and after 6 and 12 months. Among MC1R higher-risk participants, the intervention increased the likelihood of often or always wearing a shirt with sleeves (OR = 1.49, p = 0.03) and seeking shade or using an umbrella (OR = 1.42, p = 0.046), and it decreased the number of sunburns among their young children (ß = -0.13, p = 0.03). Intervention effects were not noted among MC1R average-risk participants. Moderation analyses identified intervention effects within subgroups in average-risk and higher-risk participants. Precision prevention information conveying MC1R testing results can increase the practice of some sun protection behaviors among at-risk individuals with limited melanoma risk phenotypes and may provide a cross-generational tool to counteract increasing incidence of melanoma.

11.
BMC Public Health ; 21(1): 692, 2021 04 23.
Article En | MEDLINE | ID: mdl-33888076

BACKGROUND: Individuals from melanoma-prone families have similar or reduced sun-protective behaviors compared to the general population. Studies on trends in sun-related behaviors have been temporally and geographically limited. METHODS: Individuals from an international consortium of melanoma-prone families (GenoMEL) were retrospectively asked about sunscreen use, sun exposure (time spent outside), sunburns, and sunbed use at several timepoints over their lifetime. Generalized linear mixed models were used to examine the association between these outcomes and birth cohort defined by decade spans, after adjusting for covariates. RESULTS: A total of 2407 participants from 547 families across 17 centers were analyzed. Sunscreen use increased across subsequent birth cohorts, and although the likelihood of sunburns increased until the 1950s birth cohort, it decreased thereafter. Average sun exposure did not change across the birth cohorts, and the likelihood of sunbed use increased in more recent birth cohorts. We generally did not find any differences in sun-related behavior when comparing melanoma cases to non-cases. Melanoma cases had increased sunscreen use, decreased sun exposure, and decreased odds of sunburn and sunbed use after melanoma diagnosis compared to before diagnosis. CONCLUSIONS: Although sunscreen use has increased and the likelihood of sunburns has decreased in more recent birth cohorts, individuals in melanoma-prone families have not reduced their overall sun exposure and had an increased likelihood of sunbed use in more recent birth cohorts. These observations demonstrate partial improvements in melanoma prevention and suggest that additional intervention strategies may be needed to achieve optimal sun-protective behavior in melanoma-prone families.


Melanoma , Skin Neoplasms , Sunburn , Humans , Melanoma/epidemiology , Melanoma/prevention & control , Retrospective Studies , Skin Neoplasms/epidemiology , Skin Neoplasms/prevention & control , Sunburn/epidemiology , Sunburn/prevention & control , Sunscreening Agents/therapeutic use
12.
Cancer Epidemiol Biomarkers Prev ; 26(9): 1462-1465, 2017 09.
Article En | MEDLINE | ID: mdl-28864454

Background: Few studies have focused on the relationship of exonic variation with breast cancer and subtypes defined by tumor markers: estrogen receptor (ER), progesterone receptor (PR), and HER2.Methods: We genotyped 1,764 breast cancer patients and 1,400 controls from the California Teachers Study cohort using the Infinium HumanExome Beadchip. Individual variant and gene-based analyses were conducted for overall breast cancer and by individual tumor marker subtype.Results: No exonic variants or gene-based analyses were statistically significantly associated with breast cancer overall or by ER-, PR-, or HER2-defined subtype.Conclusions: We did not detect any novel statistically significant exonic variants with overall breast cancer risk or by subtype.Impact: Exonic variants in the exome chip may not be associated with overall breast cancer or subtype susceptibility. Cancer Epidemiol Biomarkers Prev; 26(9); 1462-5. ©2017 AACR.


Breast Neoplasms/genetics , Genetic Variation/genetics , Genome-Wide Association Study/methods , California , Case-Control Studies , Female , Humans , Middle Aged , Risk
13.
Curr Atheroscler Rep ; 19(4): 18, 2017 Apr.
Article En | MEDLINE | ID: mdl-28265887

PURPOSE OF REVIEW: Introduction of combination antiretroviral therapy (ART) has increased the life expectancy of patients with HIV infection, allowing them to live longer with this chronic medical condition and consequently experiencing conditions such as cardiovascular diseases (CVDs). Several studies have investigated the increased risk of CVD in people living with HIV (PLWH). However, less is known about the exact mechanisms involved in this increased risk. Also, specific guidelines for management of CVD in PLWH have not been developed yet. In this article, we review the recent literature on the mechanisms involved in pathogenesis of CVD in PLWH, with an emphasis on coronary artery disease (CAD). RECENT FINDINGS: Although initial studies suspected the increased prevalence of traditional CVD risk factors and side effects of ART to be involved in the increased CVD risk in PLWH, recent studies have uncovered the important role of chronic persistent inflammation in this increased risk. In addition, biomarkers of inflammation have been associated with both CVD events and subclinical CAD in this population. Lastly, recent studies and ongoing clinical trials have been investigating medical interventions that aim to reduce inflammation and cardiovascular events. Different mechanisms of inflammation have been examined in PLWH, including subclinical viremia, microbial translocation, and coinfection with other pathogens such as cytomegalovirus. Although inflammatory biomarkers have been consistently associated with CVD and subclinical CVD outcomes, their prognostic value is unknown. Recent and ongoing trials are exploring the benefits of anti-inflammatory drugs, statins, and antimicrobial translocation drugs on both inflammation and CVD risk among PLWH.


Coronary Artery Disease/etiology , HIV Infections/complications , Biomarkers/analysis , Coinfection , Coronary Artery Disease/epidemiology , Humans , Inflammation , Prevalence , Risk Factors
14.
Curr Atheroscler Rep ; 19(5): 20, 2017 May.
Article En | MEDLINE | ID: mdl-28315199

PURPOSE OF REVIEW: Cardiovascular disease (CVD) increasingly afflicts people living with HIV (PLWH) in the contemporary era of antiretroviral therapy (ART). Coronary artery disease (CAD) is the most widely studied cardiovascular problem in PLWH; however, less is known about other clinically relevant subtypes of CVD such as heart failure (HF), cerebrovascular disease, sudden cardiac death, pericardial diseases, and pulmonary hypertension. This paper reviews evidence of other subtypes of CVD as emerging issues in the post-ART era. RECENT FINDINGS: Recent studies have shown that PLWH have higher risk of HF as well as subclinical impairment of left ventricular (LV) mechanics (systolic and diastolic dysfunction) and myocardial abnormalities (fibrosis and steatosis). The underlying mechanisms, however, are not well-understood. A few studies have also shown higher rates of atrial fibrillation and sudden cardiac death in PLWH. Ischemic stroke is the most common stroke type in the post-ART era, with underlying mechanisms like those identified in CAD: chronic inflammation and associated vasculopathy. Studies of great vessels (carotid artery and aorta) and peripheral arterial disease show heterogeneous results. Small subclinical pericardial effusions are common in PLWH in post-ART era. Pulmonary hypertension continues to be an underdiagnosed and potentially fatal complication of HIV infection. PLWH remain at higher risk for all types of CVD including heart failure, stroke, and arrhythmias in the post-ART era. Chronic inflammation may play an important role in this increased risk. More studies are needed to further elucidate the extent of non-coronary CVD in PLWH and the underlying mechanisms for them.


Cardiovascular Diseases/virology , HIV Infections/complications , Cardiovascular Diseases/complications , HIV Infections/physiopathology , Humans , Risk
16.
Cancer ; 118(21): 5374-83, 2012 Nov 01.
Article En | MEDLINE | ID: mdl-22965656

BACKGROUND: Testicular germ cell tumor (TGCT) incidence increased steadily in recent decades, but causes remain elusive. Germ cell function may be influenced by cannabinoids, and 2 prior epidemiologic studies reported that the use of marijuana may be associated with nonseminomatous TGCT. Here, the authors evaluate the relation between TGCTs and exposure to marijuana and other recreational drugs using a population-based case-control study. METHODS: In total, 163 patients who were diagnosed with TGCT in Los Angeles County from December 1986 to April 1991 were enrolled, and 292 controls were matched on age, race/ethnicity, and neighborhood. Participants were asked about drug use by a structured, in-person interview. Odds ratios (ORs) and 95% confidence intervals (CIs) were estimated using conditional logistic regression analysis adjusted for history of cryptorchidism; education; religiosity; and reported use of marijuana, cocaine, and amyl nitrite. RESULTS: Compared with never use, ever use of marijuana had a 2-fold increased risk (OR, 1.94; 95% CI, 1.02-3.68), whereas ever use of cocaine had a negative association with TGCT (OR, 0.54; 95% CI, 0.32-0.91). Stratification on tumor histology revealed a specific association of marijuana use with nonseminoma and mixed histology tumors (OR, 2.42; 95% CI, 1.08-5.42). CONCLUSIONS: A specific association was observed between marijuana use and the risk of nonseminoma and mixed tumors. To the authors' knowledge, this is the first report of a negative association between cocaine use and TGCT risk. The current results warrant mechanistic studies of marijuana's effect on the endocannabinoid system and TGCT risk and caution that recreational and therapeutic use of cannabinoids by young men may confer malignant potential to testicular germ cells.


Marijuana Smoking/adverse effects , Neoplasms, Germ Cell and Embryonal/epidemiology , Adolescent , Adult , Case-Control Studies , Humans , Male , Risk Factors , Testicular Neoplasms/epidemiology , Young Adult
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