What's New in Nail Dermatopathology

The presentation discusses significant advancements in nail dermatopathology, highlighting a recent article that identifies human HPV 42 in digital papillary adenocarcinoma (DPA), which is recognized as an aggressive tumor primarily affecting the distal digits. DPA presents atypical clinical symptoms, often leading to misdiagnosis, highlighting the importance of accurate identification. The article details a study using next-generation sequencing that found HPV 42 in 96% of various skin tumors, with this HPV type demonstrating an oncogenic phenotype when present in ecrine tissues. This finding suggests a conserved germ cell-like transcriptional program across HPV-driven tumors, potentially facilitating early detection and targeted therapies. The practical implications for dermatopathology are underscored, particularly in differentiating DPA from benign tumors like tubular apocrine adenoma, as misdiagnosis could delay appropriate treatment. Using available technologies such as low-risk HPV chromogenic in situ hybridization (CISH), dermatopathologists can better identify high-risk cases, emphasizing the article's relevance in clinical settings.