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Experience From a Cancer Center

Dinesh Sariya, MD; Karen Ruth, MS; Rose Adams-McDonnell, BS; Carrie Cusack, MD; XiaoWei Xu, MD, PhD; Rosalie Elenitsas, MD; John Seykora, MD, PhD; Terri Pasha, BA; Paul Zhang, MD, PhD; Marisa Baldassano, MD; Stuart R. Lessin, MD; Hong Wu, MD, PhD

Arch Dermatol. 2007;143(5):613-620.

Objective  To analyze the clinical, histopathologic, and immunohistochemical characteristics of skin metastases.

Design  Retrospective analysis (January 1, 1990, to December 31, 2005).

Setting  Comprehensive cancer center.

Patients  Fifty-one patients (21 men and 30 women) with biopsy-proven skin metastases and correlative clinical data.

Interventions  Four dermatopathologists reviewed a random mixture of metastases and primary skin tumors. Immunohistochemical studies for 12 markers were performed on the metastases, with skin adnexal tumors as controls.

Main Outcome Measures  Clinical characteristics of cutaneous lesions, clinical outcomes, histologic features, and immunohistochemical markers.

Results  Eighty-six percent (43 of 50) of the patients had known stage IV cancer, and skin metastasis was the presenting sign in 12% (6 of 50). In 45% (21 of 47) of the biopsies, the lesions were not suspected of being metastases owing to unusual clinical presentations. Seventy-six percent of the patients died of disease (median survival, 5 months). On pathologic review, many metastases from adenocarcinomas were either recognized or suspected, but the primary site was not easily identified based on histologic findings alone. Metastases from small cell carcinomas and sarcomas were histologically misinterpreted as primary skin tumors. Immunohistochemical analysis using a panel including p63, B72.3, calretinin, and CK5/6 differentiated metastatic carcinoma from primary skin adnexal tumors.

Conclusions  Cutaneous metastases can have variable clinical appearances and can mimic benign skin lesions. They are usually seen in patients with advanced disease, but they can be the presenting lesion. Although many metastatic adenocarcinomas can be recognized based on histologic findings alone, immunohistochemical analysis is an important diagnostic adjunct in some cases.

Author Affiliations: Departments of Pathology (Drs Sariya and Wu and Ms Adams-McDonnell), Biostatistics (Ms Ruth), and Medical Oncology (Dr Lessin), Fox Chase Cancer Center, Philadelphia, Pa; Departments of Dermatology (Drs Cusack, Elenitsas, and Seykora) and Pathology and Laboratory Medicine (Drs Xu and Zhang and Ms Pasha), Hospital of the University of Pennsylvania, Philadelphia; and Baldassano Dermatopathology PC (Dr Baldassano), Blue Bell, Pa.

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