Topical therapy for regression and melanoma prevention of congenital giant nevi.

Giant congenital melanocytic nevi are NRAS-driven proliferations that may cover up to 80% of the body surface. Their most dangerous consequence is progression to melanoma. This risk often triggers preemptive extensive surgical excisions in childhood, producing severe lifelong challenges. We have presented preclinical models, including multiple genetically engineered mice and xenografted human lesions, which enabled testing locally applied pharmacologic agents to avoid surgery. The murine models permitted the identification of proliferative versus senescent nevus phases and treatments targeting both. These nevi recapitulated the histologic and molecular features of human giant congenital nevi, including the risk of melanoma transformation. Cutaneously delivered MEK, PI3K, and c-KIT inhibitors or proinflammatory squaric acid dibutylester (SADBE) achieved major regressions. SADBE triggered innate immunity that ablated detectable nevocytes, fully prevented melanoma, and regressed human giant nevus xenografts. These findings reveal nevus mechanistic vulnerabilities and suggest opportunities for topical interventions that may alter the therapeutic options for children with congenital giant nevi.

Assessment of diagnostic delay, morbidity, and mortality outcomes in 302 calciphylaxis patients over a 17-year period: A retrospective cohort study.

BACKGROUND: Calciphylaxis patients historically have experienced diagnostic challenges and high morbidity; however limited data is available examining these characteristics over time. OBJECTIVE: The primary goals were to a) investigate factors associated with diagnostic delay of calciphylaxis and b) assess morbidity outcomes. The secondary goal was to provide updated mortality rates. METHODS: A retrospective review of 302 adult patients diagnosed with calciphylaxis between January 1, 2006 and December 31, 2022 was conducted. Univariate and multivariate statistical analyses were performed. RESULTS: Nonnephrogenic calciphylaxis (P = .0004) and involvement of the fingers (P = .0001) were significantly associated with an increased diagnostic delay, whereas involvement of the arms (P = .01) and genitalia (P = .022) resulted in fewer days to diagnosis. Almost all patients with genitalia, finger, or toe involvement had nephrogenic disease. The number of complications per patient decreased with time, especially for wound infections (P = .028), increase in lesion number (P = .012), and recurrent hospitalizations (P = .020). Updated 1-year mortality rates were 36.70% and 30.77% for nephrogenic and nonnephrogenic calciphylaxis, respectively. LIMITATIONS: Limitations include the retrospective nature and data from a single institution. CONCLUSION: Diagnostic delay, particularly in nonnephrogenic calciphylaxis, and complications per patient decreased with time, highlighting the importance of continued awareness to expedite diagnosis. Mortality rates have continued to improve in recent years.

Histopathologic Evolution of Melanocytes Associated With Rapid Clinical Progression of Melanoma: Clinicopathologic Presentation of Hyperprogressive Disease in a Patient Treated With Immunotherapy.

ABSTRACT: This report describes the case of a 71-year-old woman with nodular melanoma who experienced rapid clinical deterioration 3 weeks after receiving immunotherapy treatment. Given this presentation, there was high suspicion for tumor hyperprogression, which has been observed as a paradoxical response to the use of immunotherapy in the treatment of melanoma. Histopathologic and genomic changes of primary tumor are documented at several different timepoints relative to immunotherapy treatment that may depict important alterations associated with hyperprogressive disease. To our knowledge, this case is the first to document the evolution of histopathologic features of melanoma associated with hyperprogressive disease.

Systemic Medications Associated With Hair Texture Changes.

BACKGROUND: In addition to hair loss, alterations in hair texture can be a worrisome side effect of certain medications yet are seldom reported and poorly characterized. OBJECTIVE: To systematically analyze the scientific literature to characterize medication-associated hair texture changes. METHODS: Relevant primary literature within PubMed and Cochrane was reviewed from 1985-2021 including 31 articles (1 randomized controlled trial with texture changes incidentally noted, 6 cohort, 1 cross-sectional, 23 case studies), comprising 2594 patients. RESULTS: Texture changes were associated primarily with antineoplastic agents (n = 97), antiepileptics (n = 56), retinoids (n = 15), immunomodulators (n = 3), and antiretroviral therapy (n = 1). Average age was 48.4 years old (41.2% female). De novo or exaggerated curling patterns were most commonly reported. Average time to texture change varied from 4.5 months (immunomodulators) to 17 months (antiretrovirals). Prognosis was seldom discussed with reversibility noted across all medication classes (n = 17/21; 3 weeks to 5 years post therapy). Irreversible changes were linked with antiretrovirals, retinoids, and antineoplastics. LIMITATIONS: Inability to define true incidence rates, ethnicity, and severity of texture changes due to the nature of available literature. CONCLUSIONS: Hair texture changes are potential side effects of antineoplastics, antiepileptics, retinoids, immunomodulators, and antiretroviral therapy. As these can have associated psychosocial impact, awareness among prescribing physicians is important.J Drugs Dermatol. 2022;21(9):989-996 doi:10.36849/JDD.6852.

Clinical mimickers of calciphylaxis: A retrospective study.

BACKGROUND: Calciphylaxis is an ischemic vasculopathy with high morbidity and mortality. Early and accurate diagnosis is critical to management of calciphylaxis. Clinical mimickers may contribute to delayed or misdiagnosis. OBJECTIVE: To assess the rate and risk factors for misdiagnosis and to identify clinical mimickers of calciphylaxis. METHODS: A retrospective medical record review was conducted of patients with calciphylaxis at a large urban tertiary care hospital between 2006 and 2018. RESULTS: Of 119 patients diagnosed with calciphylaxis, 73.1% were initially misdiagnosed. Of patients not initially misdiagnosed, median time to diagnosis from initial presentation was 4.5 days (interquartile range, 1.0-23.3), compared to 33 days (interquartile range, 13.0-68.8) in patients who were initially misdiagnosed (P = .0002). The most common misdiagnoses were cellulitis (31.0%), unspecified skin infection (8.0%), and peripheral vascular disease (6.9%). Patients who were misdiagnosed frequently received at least 1 course of antibiotics. Patients with end-stage renal disease were less likely to be misdiagnosed than those without this disease (P = .001). LIMITATIONS: Single-center, retrospective study. CONCLUSIONS: Understanding the risk factors for misdiagnosis of calciphylaxis is an opportunity for further education concerning this rare disease.

Assessment of outcomes of calciphylaxis.

BACKGROUND: Calciphylaxis is a rare thrombotic vasculopathy characterized by high morbidity and mortality. There is a paucity of studies examining longitudinal outcomes. OBJECTIVE: To assess mortality, days spent in the hospital, and amputations in patients with calciphylaxis. METHODS: A retrospective medical record review was conducted in 145 patients diagnosed with calciphylaxis at an urban tertiary care hospital from January 2006 to December 2018. RESULTS: Six-month mortality was 37.2%, and 1-year mortality was 44.1%. Patients with nephrogenic calciphylaxis had worse survival than those with nonnephrogenic calciphylaxis (P = .007). This difference in survival disappeared when limiting mortality to deaths due to calciphylaxis. Age (P = .003) and end-stage renal disease (P = .01) were risk factors associated with 1-year mortality. Diabetes mellitus was associated with greater total hospitalization days (coefficient, 1.1; 95% confidence interval, 1.01-1.4); bedside debridement was associated with fewer hospitalization days (coefficient, 0.8; 95% confidence interval, 0.7-0.9). Amputations were not associated with any of the examined risk factors. The use of warfarin followed by a transition to nonwarfarin anticoagulation was associated with decreased hazard of death (P = .01). LIMITATIONS: Retrospective nature. CONCLUSIONS: Calciphylaxis remains a complex, heterogeneous disease. Mortality is lower in patients with nonnephrogenic disease. These findings may be incorporated during discussions regarding the goals of care to facilitate informed shared decision making.

Penile calciphylaxis: A retrospective case-control study.

BACKGROUND: Calciphylaxis is a rare disorder characterized by skin necrosis caused by calcium deposition within vessels, thrombosis, and subsequent tissue ischemia. Penile involvement may rarely occur. OBJECTIVE: To identify risk factors, diagnosis, management, and mortality of patients with penile calciphylaxis. METHODS: A retrospective medical record review was conducted of 16 patients with penile calciphylaxis treated at 2 large urban tertiary care centers between January 2001 and December 2019. A control group of 44 male patients with nonpenile calciphylaxis at the same institution was included. RESULTS: The median survival of patients with penile calciphylaxis was 3.8 months (interquartile range, 27.0 months). Mortality was 50% at 3 months and 62.5% at 6 months for penile calciphylaxis, and 13.6% at 3 months and 29.5% at 6 months for controls (P = .008). Patients with penile calciphylaxis were less likely to be obese (P = .04) but more likely to have hyperparathyroidism (P = .0003) and end-stage renal disease (P = .049). LIMITATIONS: Retrospective study design and small sample size. CONCLUSIONS: This study further defines the disease course of penile calciphylaxis, which has high mortality. Imaging may be used to aid diagnosis. Risk factors include end-stage renal disease, hyperparathyroidism, and normal body mass index.

Implementation and Impact of a Store-and-Forward Teledermatology Platform in an Urban Academic Safety-Net Health Care System.

Background:Minority and low-income patients disproportionately experience dermatologic access challenges. Store-and-forward (SAF) teledermatology has emerged as a model of care delivery that may improve access. We sought to evaluate patterns of utilization and overall impact after SAF teledermatology implementation in a safety-net health care system. Methods:We performed a retrospective review of 3,285 teledermatology consultations from 2014 to 2017 in an urban academic safety-net health care system. Results:A total of 1,680 (51.2%) patients were referred for inflammatory/rash conditions and 967 (29.5%) for skin lesions. The teledermatologist recommended in-person evaluation in 1,199 encounters (36.5%). Median wait time for a subsequent appointment was 36 days (range 0-244 days). Of subsequent in-clinic visits, 237 patients (26.4%) underwent skin biopsy. No-show rate after referral was 11.8%. In comparison, median wait time for dermatology appointment through standard referral was 64 days, with a no-show rate of 18.6%. Biopsy rate of patients referred via teledermatology was 26.4%, in comparison to a rate of 10.9% of patients referred directly from primary care provider. Discussion:Implementation of SAF teledermatology in a safety-net health system resulted in avoidance of 63.5% potential dermatology visits. Consultation typically resulted in a change in suspected diagnosis or management plan. Rates of concordance between teledermatology consults and in-person evaluations were high. Median wait time was reduced by almost half, no-show rate was reduced ∼37%, and biopsy rate was more than double for teledermatology patients compared with standard referral. Conclusion:These findings suggest that SAF teledermatology may improve access to high-quality dermatologic care and increase clinic efficiencies for patients in safety-net health care systems.

Laser Plume From Human Papillomavirus-Infected Tissue: A Systematic Review.

BACKGROUND: Laser procedures are becoming more prevalent across multiple medical specialties for a variety of indications. The plumes created by these lasers have raised concern for the dissemination of an infectious material. OBJECTIVE: To review and summarize the information on viral dissemination in laser plumes available in the literature. MATERIALS AND METHODS: Data Sources A systematic review was performed on English and non-English articles using the PubMed and the Cochrane databases. A manual search of bibliographies from relevant articles was also performed to collect additional studies. STUDY SELECTION: Only articles in the English language with full texts available that pertained to viral particles in laser plumes were included. Data Extraction Two authors performed independent article selections using predefined inclusion and exclusion criteria. RESULTS: There have been case reports of possible transmission of human papillomavirus (HPV) by inhalation of laser-produced aerosols. Multiple investigators have attempted to recreate this scenario in the laboratory to qualify this risk. Others have conducted clinical experiments to determine the presence of HPV in laser plumes. CONCLUSION: The current body of the literature suggests that laser surgeons are at a risk for HPV exposure by inhalation of laser-derived aerosols. We offer best practice recommendations for laser operators.

Oral Metformin for Treating Dermatological Diseases: A Systematic Review.

Introduction:Metformin is an antihyperglycemic medication most commonly used to treat Type II Diabetes Mellitus with promising off-label application for the treatment of hidradenitis suppurativa, psoriasis, acne, acanthosis nigricans, and hirsutism. Objective: To comprehensively assess evidence regarding the use of metformin for treating primary cutaneous disorders. Materials and Methods: A systematic literature search was conducted through PubMed, Cochrane, Web of Science, and CINAHL to identify the role of metformin in primary skin disease. Results: Sixty-four studies met inclusion criteria. Metformin demonstrates promising clinical response and favorable safety profile for treatment of HS, with most patients experiencing a decrease in frequency or severity of HS flares, and some experiencing full resolution of HS lesions. Patients with psoriasis treated with metformin experienced quantifiable clinical responses. Application of metformin on polycystic ovarian disease (PCOS) related acne, acanthosis nigricans, and hirsutism yielded mixed clinical results. No serious adverse effects were reported. Conclusion: Metformin is safe and efficacious and may be considered as an adjunctive therapy for the treatment of psoriasis and hidradenitis suppurativa in addition to first line therapies as well as PCOS related acne, acanthosis nigricans, and hirsutism. J Drugs Dermatol. 2020;19(8): doi:10.36849/JDD.2020.4874.

Management of metastatic melanoma: improved survival in a national cohort following the approvals of checkpoint blockade immunotherapies and targeted therapies.

BACKGROUND: Immune checkpoint blockade (ICB) and BRAFV600-targeted therapy have demonstrated substantial clinical efficacy for patients with stage 4 melanoma in clinical trials; however, their impact on survival and barriers to treatment in the "real-life" setting remains unknown. METHODS: Patients who presented with cutaneous melanoma during 2004-2015 using the National Cancer Database, which comprises > 70% of all newly diagnosed cancers in the U.S., were evaluated for predictors of presenting with stage 4 disease and receiving ICB, and for their associated unadjusted and risk-adjusted overall survival (OS). RESULTS: 17,975 patients presented with stage 4 metastatic cutaneous melanoma. Overall, patients who presented after the FDA's initial approvals (starting in 2011) for ICB and BRAFV600-targeted therapy demonstrated a 31% relative improvement in 4-year OS (p < 0.001), compared to pre-2011. Following the initial approvals in 2011, improved OS was associated in risk-adjusted analyses with ICB (HR 0.57, 95CI 0.52-0.63). ICB demonstrated improved median and 4-year OS of 16.9 months (95CI 15.6-19.3; vs. 7.7 months, 95CI 7.2-8.4) and 32.4% (95CI 29.5-35.3; vs. 21.0%, 95CI 19.6-22.2, all p < 0.001), respectively; improved OS was persistent in unadjusted and risk-adjusted landmark survival analyses. Uninsured patients and management in the community setting were less likely to receive ICB in multivariable analyses. CONCLUSIONS: In a national "real-life" treatment population, we show that the wide availability of the novel treatment modalities ICB and BRAFV600-targeted therapy has significantly improved the survival of patients with stage 4 melanoma. Our findings additionally suggest that there are opportunities for expanding coverage and access to these novel immunotherapies in community practice.

Serious infections among a large cohort of subjects with systemically treated psoriasis.

BACKGROUND: Biologic therapy is effective for treatment of moderate-to-severe psoriasis but may be associated with an increased risk for serious infection. OBJECTIVE: To estimate the serious infection rate among patients with psoriasis treated with biologic as compared with nonbiologic systemic agents within a community-based health care delivery setting. METHODS: We identified 5889 adult Kaiser Permanente Northern California health plan members with psoriasis who had ever been treated with systemic therapies and calculated the incidence rates and 95% confidence intervals (CIs) for serious infections over 29,717 person-years of follow-up. Adjusted hazard ratios (aHRs) were calculated using Cox regression. RESULTS: Adjusting for age, sex, race or ethnicity, and comorbidities revealed a significantly increased risk for overall serious infection among patients treated with biologics as compared with those treated with nonbiologics (aHR, 1.31; 95% CI, 1.02-1.68). More specifically, there was a significantly elevated risk for skin and soft tissue infection (aHR, 1.75; 95% CI, 1.19-2.56) and meningitis (aHR, 9.22; 95% CI, 1.77-48.10) during periods of active biologic use. LIMITATIONS: Risk associated with individual drugs was not examined. CONCLUSION: We found an increased rate of skin and soft tissue infections among patients with psoriasis treated with biologic agents. There also was a signal suggesting increased risk for meningitis. Clinicians should be aware of these potential adverse events when prescribing biologic agents.

High-performance genetically targetable optical neural silencing by light-driven proton pumps.

The ability to silence the activity of genetically specified neurons in a temporally precise fashion would provide the opportunity to investigate the causal role of specific cell classes in neural computations, behaviours and pathologies. Here we show that members of the class of light-driven outward proton pumps can mediate powerful, safe, multiple-colour silencing of neural activity. The gene archaerhodopsin-3 (Arch) from Halorubrum sodomense enables near-100% silencing of neurons in the awake brain when virally expressed in the mouse cortex and illuminated with yellow light. Arch mediates currents of several hundred picoamps at low light powers, and supports neural silencing currents approaching 900 pA at light powers easily achievable in vivo. Furthermore, Arch spontaneously recovers from light-dependent inactivation, unlike light-driven chloride pumps that enter long-lasting inactive states in response to light. These properties of Arch are appropriate to mediate the optical silencing of significant brain volumes over behaviourally relevant timescales. Arch function in neurons is well tolerated because pH excursions created by Arch illumination are minimized by self-limiting mechanisms to levels comparable to those mediated by channelrhodopsins or natural spike firing. To highlight how proton pump ecological and genomic diversity may support new innovation, we show that the blue-green light-drivable proton pump from the fungus Leptosphaeria maculans (Mac) can, when expressed in neurons, enable neural silencing by blue light, thus enabling alongside other developed reagents the potential for independent silencing of two neural populations by blue versus red light. Light-driven proton pumps thus represent a high-performance and extremely versatile class of 'optogenetic' voltage and ion modulator, which will broadly enable new neuroscientific, biological, neurological and psychiatric investigations.