Bullous pemphigoid associated with anti-programmed cell death protein 1 and anti-programmed cell death ligand 1 therapy: A case series of 13 patients.

We present a case series of 13 patients, the first Australian single-centre study of bullous pemphigoid (BP) associated with immune checkpoint inhibitors (ICI): cytotoxic T-lymphocyte antigen (CTLA4) and programmed cell death receptor (PD1) inhibitors. All our patients achieved adequate control of BP with a combination of treatments including oral prednisolone, intravenous immunoglobulin, rituximab and omalizumab. The majority of patients ceased or interrupted immunotherapy treatment upon diagnosis of BP and greater tumour progression was seen in the cohort who ceased immunotherapy.

Clinical and histopathological features of onychopapilloma in an Australian setting: A case series of 50 patients.

Onychopapilloma is an uncommon tumour of the nailbed and the distal nail matrix. To date, only 19 case reports and case series have been reported in the literature. This article includes literature review on all reported cases and provides the first case series of onychopapilloma in an Australian population, evaluating the clinical features and histopathological diagnosis of patients with onychopapilloma in an Australian subspecialty nail clinic.

Acanthosis nigricans in a patient with metastatic insulinoma post peptide receptor radionuclide therapy.

Summary: Acanthosis nigricans (AN) is a common dermatosis associated with hyperinsulinemia and insulin resistance. However, AN has been rarely reported in patients with insulinoma, a state of persistent hyperinsulinemia. We present a case of metastatic insulinoma, in whom AN manifested after the first cycle of peptide receptor radionuclide therapy (PRRT). A 40-year-old man was diagnosed with metastatic insulinoma after 5 months of symptomatic hypoglycemia. Within 1 month post PRRT, the patient became euglycemic but developed a pigmented, pruritic rash which was confirmed on biopsy as AN. We discuss the rare manifestation of AN in subjects with insulinoma, the role of insulin in the pathogenesis of AN, malignant AN in non-insulin-secreting malignancies and association with other insulin-resistant endocrinopathies such as acromegaly. Learning points: Acanthosis nigricans (AN) is a common dermatosis which is typically asymptomatic and associated with the hyperinsulinemic state. Malignant AN can rapidly spread, cause pruritus and affect mucosa and the oral cavity. AN is extremely rare in patients with insulinoma despite marked hyperinsulinemia. Peptide receptor radionuclide therapy might have triggered TGF-α secretion in this subject which led to malignant AN. Rapid spread or unusual distribution of pruritic AN warrants further investigation to exclude underlying malignancy.

Plasma Cell Vulvitis: A Systematic Review of Interventions.

OBJECTIVES: Plasma cell vulvitis (PCV) is a rare chronic inflammatory disorder, where the symptoms can be severe and may affect patient's quality of life. However, there are currently no evidence-based treatment guidelines. The aims of this systematic review were to evaluate efficacy of individual treatments and to inform future research. MATERIALS AND METHODS: A systematic search was conducted of publication between 1952 and August 2020 via MEDLINE, Embase, and Emcare. All publications that evaluated the efficacy of treatments for patients with PCV were included. Forty-seven publications comprising 45 case reports and case series and 2 cohort studies were included. RESULTS: To date, there are no randomized controlled trials evaluating the efficacy of different treatment options. There are also no studies that assess the impact of treatment on quality of life. Topical corticosteroids are the most frequently used first-line therapy, with limited evidence to support their efficacy, followed by topical imiquimod and surgical excision. The least supported intervention is cryotherapy. CONCLUSIONS: Although descriptive studies support the use of topical corticosteroids and, to a lesser degree, topical calcineurin inhibitors and imiquimod, this review highlights the need for standardized outcome measures and randomized clinical trials for more definitive therapeutic recommendations for women with PCV.