{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,25]],"date-time":"2026-02-25T09:25:22Z","timestamp":1772011522999,"version":"3.50.1"},"reference-count":18,"publisher":"Wiley","issue":"11","license":[{"start":{"date-parts":[[2022,8,23]],"date-time":"2022-08-23T00:00:00Z","timestamp":1661212800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J Cutan Pathol"],"published-print":{"date-parts":[[2022,11]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Background<\/jats:title><jats:p>Programmed cell death protein (PD\u20101) and programmed death\u2010ligand 1 (PD\u2010L1) inhibition checkpoint blockade leads to various cutaneous adverse reactions, including bullous pemphigoid and lichen\u2010planus\u2010like reactions. However, lichen planus pemphigoides (LPP), manifesting histopathologic features of both lichen planus and bullous pemphigoid, has more rarely been associated with immunotherapy.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>The clinical and histopathologic findings of three patients were examined, and a review of cases of LPP and bullous lichen planus secondary to PD\u20101 inhibitor therapy was performed.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Three patients (two with advanced non\u2010small\u2010cell lung adenocarcinoma and the third with metastatic breast cancer) presented with both lichenoid eruptions and bullae. Biopsy of the lesions revealed lichenoid tissue reactions in all three patients. Together with the histopathologic findings, direct immunofluorescence (DIF) showing linear C3 and IgG deposition and positive enzyme\u2010linked immunosorbent assay (ELISA) showing BP180 positivity supported a diagnosis of LPP in two patients. The third patient in our series also showed confirmatory ELISA testing supporting LPP.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Lichen planus pemphigoides is a distinct cutaneous toxicity to checkpoint inhibitor therapy illustrates a possible pathogenic mechanism and the importance of dermatopathology recognition to render an accurate diagnosis.<\/jats:p><\/jats:sec>","DOI":"10.1111\/cup.14299","type":"journal-article","created":{"date-parts":[[2022,8,3]],"date-time":"2022-08-03T14:14:38Z","timestamp":1659536078000},"page":"978-987","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Lichen\u2010planus\u2010pemphigoides\u2010like reaction to PD\u20101 checkpoint blockade"],"prefix":"10.1111","volume":"49","author":[{"given":"Margaret","family":"Wat","sequence":"first","affiliation":[{"name":"Division of Dermatology, Departments of Medicine and Pathology University of Arizona Health Sciences, Banner University Medical Center  Tucson Arizona USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nicholas K.","family":"Mollanazar","sequence":"additional","affiliation":[{"name":"Department of Dermatology Hospital of the University of Pennsylvania  Philadelphia Pennsylvania USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christoph T.","family":"Ellebrecht","sequence":"additional","affiliation":[{"name":"Department of Dermatology Hospital of the University of Pennsylvania  Philadelphia Pennsylvania USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Amy","family":"Forrestel","sequence":"additional","affiliation":[{"name":"Department of Dermatology Hospital of the University of Pennsylvania  Philadelphia Pennsylvania USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rosalie","family":"Elenitsas","sequence":"additional","affiliation":[{"name":"Department of Dermatology Hospital of the University of Pennsylvania  Philadelphia Pennsylvania USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5625-2782","authenticated-orcid":false,"given":"Emily Y.","family":"Chu","sequence":"additional","affiliation":[{"name":"Department of Dermatology Hospital of the University of Pennsylvania  Philadelphia Pennsylvania 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