Publications by authors named "Wm Christopher Mathews"

Article Synopsis
  • The study examined risk factors and outcomes for invasive anal cancer (IAC) in people with HIV, noting significant differences in individual risk levels.
  • Researchers followed 4,105 individuals from a cohort who underwent anal cancer screening over roughly 5.5 years, where 33 developed IAC, particularly among those with anal high-grade squamous intraepithelial lesions (aHSILs) and low CD4 counts.
  • Those presenting with both aHSILs and a nadir CD4 count of 200 cells/µL or less had an alarmingly increased risk, underlining the crucial need for early detection and proactive screening to improve patient outcomes.
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Article Synopsis
  • The study investigates genetic factors linked to substance use in people with HIV (PWH), who have higher substance use rates than the general population.
  • Researchers conducted genome-wide association studies (GWAS) on a diverse group of 7,542 PWH, analyzing both previously identified and novel genetic associations with alcohol, smoking, and cannabis use.
  • Results revealed several known genetic variants related to substance use and identified two new loci associated with cannabis use cessation, enhancing understanding of genetic influences on substance use in PWH.
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Objectives: People living with HIV (PWH) with substance or alcohol use often have unsuppressed plasma HIV viral loads (pVL). The degree to which substance and alcohol use effects on HIV viral suppression are mediated through medication nonadherence is incompletely understood.

Methods: We included PWH prescribed antiretroviral therapy and receiving care at an academic HIV clinic between 2014 and 2018 who completed both patient-reported outcomes (PRO) questionnaires and had subsequent pVL measurements.

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Background: Anal high-grade squamous intraepithelial lesion (aHSIL) is the immediate precursor of anal cancer. Anal cytology is a recommended screening test to identify aHSIL among people with human immunodeficiency virus (HIV; PWH). Heterogeneity of risk for invasive anal cancer among PWH suggests the value of a shared decision-making framework regarding screening.

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Background: Little is known about the risk of hepatitis C virus (HCV) reinfection among people with HIV (PWH) in the direct-acting antiviral (DAA) era. We evaluate HCV reinfection rates in the DAA era and characterize presustained virologic response (SVR) behavioral risk factors associated with reinfection among PWH at the University of California, San Diego (UCSD).

Methods: Observational longitudinal cohort of PWH treated with DAAs between 2014 and July 2019 who achieved SVR and had at least 1 subsequent HCV viral load measurement.

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Background: Meta-analyses of general population studies report mean low-density lipoprotein cholesterol (LDL-C) reductions of 30% to <50% with moderate-intensity and ≥50% with high-intensity statins. Persons living with human immunodeficiency virus (PLWH) are at high risk for atherosclerotic cardiovascular disease (ASCVD), yet many have elevated LDL-C.

Objective: To evaluate LDL-C response after statin initiation among PLWH.

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Background: Clinicians are incorporating patient-reported outcomes in the management of HIV-infected persons co-infected with hepatitis C virus (HCV), but there are no validated inventories to monitor symptoms of patients during HCV therapy.

Design: Five-year retrospective cohort analysis of persons living with HIV (PLWH) treated for HCV.

Methods: The HCV symptom-inventory (HCV-SI) was administered before, during, and after HCV treatment.

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Heavy drinking is prevalent among people living with HIV. Studies use tools like patient-reported outcomes (PROs) to quantify alcohol use in a detailed, timely manner. However, if alcohol misuse influences PRO completion, selection bias may result.

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Background: A recent meta-analysis suggested that anal intraepithelial neoplasia and invasive anal cancer are more prevalent among black men having sex with men (MSM).

Methods: We conducted a retrospective cohort of HIV-infected adult patients under care between 2001 and 2012. Disparities in clinical evolution of anal intraepithelial neoplasia to high-grade squamous intraepithelial lesion (HSIL) and invasive anal cancer were evaluated in a three-state Markov model adjusted for cytology misclassification.

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There are two commercially available vaccines licensed worldwide for the prevention of cervical cancer and other human papillomavirus-associated cancers such as anal cancer. However, only two countries have implemented healthcare programs that include human papillomavirus vaccination for boys and men. Although most of the human papillomavirus-related cancers in the world are attributable to cervical cancer, in developed countries anal cancer accounts for a larger proportion of human papillomavirus-related cancers.

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Background: The accuracy of screening for anal cancer precursors relative to screening for cervical cancer precursors has not been systematically examined. The aim of the current meta-analysis was to compare the relative accuracy of anal cytology to cervical cytology in discriminating between histopathologic high grade and lesser grades of dysplasia when the reference standard biopsy is obtained using colposcope magnification.

Methods And Findings: The outcome metric of discrimination was the receiver operating characteristic (ROC) curve area.

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Background: Frequent methamphetamine use among recently HIV infected individuals is associated with transmitted drug resistance (TDR) to non-nucleoside reverse transcriptase inhibitors (NNRTI); however, the reversion time of TDR to drug susceptible HIV may exceed 3 years. We assessed whether recreational substance use is associated with detectable TDR among individuals newly diagnosed with HIV infection of unknown duration.

Design: Cross-sectional analysis.

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In 1982, Mathews et al. surveyed San Diego County Medical Society's (SDCMS) physicians about their attitudes toward homosexuality. They found significant differences in prevalence of homophobic attitudes by gender, year of medical school graduation, specialty, and practice setting.

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Purpose: The study aims were to ascertain, among attending and house staff at a single academic medical center, the prevalence of and risk factors for psychiatric symptoms and disorders and for personal health behaviors.

Methods: A self-administered, anonymous 72-item survey of physicians was conducted in February 2003.

Results: Response rate was 37.

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Objectives: Outbreaks of community-acquired methicillin-resistant Staphylococcus aureus (CA-MRSA) have been noted in multiple sites in the United States. This study's purpose was to estimate trends in the incidence of and risk factors for clinically significant MRSA (CS-MRSA) infection in a cohort of HIV-infected adults.

Design: A retrospective clinic-based cohort (January 1, 2000-December 31, 2003) study.

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Anal dysplasia associated with human papillomavirus (HPV) infection occurs in substantial proportions of HIV-infected men and women and poses risk for anal carcinoma. Whether to routinely screen for HPV-associated anal dysplasia in this population, however, remains a debated question. Anal dysplasia is detectable by Pap screening and colposcopic biopsy; as Pap testing results have relatively low reproducibility, 2 baseline tests may be prudent.

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