Frequent Occurrence of High‐Risk Basal Cell Carcinoma in Xeroderma Pigmentosum: A Histopathological Insight From an Indian Cohort.

ABSTRACT Background Methods Results Conclusions Xeroderma pigmentosum (XP) is a genodermatosis, characterized both by premature aging and significantly increased risk of non‐melanoma and melanoma skin cancers at an early age. However, limited literature is available on the common histopathological subtypes of basal cell carcinoma (BCC) in these patients.In this ambispective case series, we recruited patients of XP who had either a currently present skin tumor or previously excised one, provided their histopathological sections were available. Cytogenetic analysis was performed in all the patients. The histopathological findings were recorded by two trained dermatopathologists.Of 22 recruited patients with XP, 12 patients had 41 BCCs, and 23 (56.09%) of them showed a high‐risk histopathological subtype. Basosquamous carcinoma (10, 24.39%) was the most frequent high‐risk tumor followed by infiltrative variant (7, 17.07%). Mixed‐histopathological subtypes were noted in six (14.63%) cases, and all of them had a high‐risk component. The low‐risk subtypes included nodular (n = 17, 41.46%) and superficial BCC (1, 2.43%). Though a deep dermal involvement was seen in 27 (65.85%) lesions, none showed a perineural invasion or necrosis. Three (7.31%) lesions showed ulceration, while 10 (24.39%) showed presence of pigmentation.A frequent occurrence of high‐risk basal cell carcinoma was noted in patients with XP‐mandating creation of appropriate treatment and follow‐up strategies in these patients. [ABSTRACT FROM AUTHOR]