Expression of p16 in Hypertrophic Lichen Planus.

Background: Although cutaneous squamous cell carcinoma (SCC) arising from lichen planus is rare, hypertrophic lichen planus (HLP) accounts for most of these malignant transformations. Although the mechanism of malignant pathogenesis remains unknown, reports of similar premalignant conditions suggest a potential role of tumor suppressor p16. This is the first study to our knowledge to examine p16 expression in HLP in comparison to cutaneous invasive SCC and normal skin and its implications for malignant transformation.

Inhibition of glutaminase elicits senolysis in therapy-induced senescent melanoma cells.

The cyclin D1-Cyclin-Dependent Kinases 4 and 6 (CDK4/6) complex is crucial for the development of melanoma. We previously demonstrated that targeting CDK4/6 using small molecule inhibitors (CDK4/6i) suppresses Braf melanoma growth in vitro and in vivo through induction of cellular senescence. However, clinical trials investigating CDK4/6i in melanoma have not yielded successful outcomes, underscoring the necessity to enhance the therapeutic efficacy of CDK4/6i.

Tattoo-Induced Exacerbations of Systemic Disease and Uveitis.

To examine an underreported and underdiagnosed phenomenon with implications for the pathophysiological mechanisms of tattoo-induced uveitis. Two cases highlighting the clinical presentation of tattoo-related uveitis were evaluated. A 28-year-old man with biopsy-proven sarcoidosis and ocular manifestations presented with worsening retinal vasculitis after acquiring a red-ink tattoo.

Dermatopathology Trends in African Americans: A Retrospective Analysis of Biopsies.

In a retrospective analysis of biopsies from January 1, 2019 to December 31, 2020, at University Hospitals Cleveland Medical Center, we aimed to determine the frequency of dermatologic conditions biopsied in African Americans (AA). Given that AAs constitute 13.4% of the US population, understanding the skin disease profile within this significant demographic is crucial.

Vitamin D3 and deconvoluting a rash.

BACKGROUNDAdverse drug reactions are unpredictable immunologic events presenting frequent challenges to clinical management. Systemically administered cholecalciferol (vitamin D3) has immunomodulatory properties. In this randomized, double-blinded, placebo-controlled interventional trial of healthy human adults, we investigated the clinical and molecular immunomodulatory effects of a single high dose of oral vitamin D3 on an experimentally induced chemical rash.

Genomic Analysis of Cutaneous CD30-Positive Lymphoproliferative Disorders.

Primary cutaneous CD30 T-cell lymphoproliferative disorders are the second most common cutaneous lymphomas. According to the World Health Organization, CD30 T-cell lymphoproliferative disorders include primary cutaneous anaplastic large cell lymphoma (C-ALCL) and lymphomatoid papulosis (LyP) as well as borderline lesions. C-ALCL and LyP are thought to represent two ends of a spectrum of diseases that have different clinical presentations, clinical courses, and prognoses in their classic forms but share the same histology of medium to large CD30 atypical lymphoid cell infiltrates.

Incidence of missing pathology specimens in dermatology.

Background: Occasionally specimen containers are received in the dermatopathology laboratory without an accompanying specimen. The consequences in this scenario can range from delay in care and inconvenience to patients to increased morbidity and even mortality. Data regarding incidence and associated characteristics of missing specimens are scant.

Bilateral periorbital leukemia cutis presenting as suspected cellulitis.

Many conditions present with periorbital edema and erythema, mimicking preseptal cellulitis. We report the unique case of a patient with relapsed monoblastic mutant isocitrate dehydrogenase-2 (IDH2) acute myeloid leukemia (AML) who presented with periorbital edema and erythema, unresponsive to antibiotics. Histopathology from punch biopsy was consistent with leukemia cutis.

Pure and Mixed Desmoplastic Melanomas: A Retrospective Clinicopathologic Comparison of 33 Cases.

Background: Pure and mixed desmoplastic melanomas (DMs) may have different natural histories and behaviors.

Methods: We conducted a retrospective review of patients diagnosed with DM at our institution between January 1997 and April 2019. A total of 33 unique DMs were identified and subsequently analyzed based on the histologic type (pure vs.

Spitz nevi in African Americans: A retrospective chart review of 11 patients.

Background: Spitz nevi are benign melanocytic neoplasms that typically present as rapidly growing solitary lesions on the head, neck, or lower extremities. Very rare reports have been described in African Americans.

Methods: A single-institution 29-year retrospective review of African American patients diagnosed with Spitz nevi was thoroughly analyzed in order to characterize these rare clinical and histopathologic presentations.