Unsuspected skin metastasis of adenocarcinoma of the prostate in a patient on goserelin (Zoladex)

Prostate cancer remains the most common noncutaneous cancer in men, especially in this era of prostate-specific antigen assay. Prostate cancer metastases have been known to commonly affect the lymphatics, bones, and lungs. Prostate cancer metastasis to the skin is very rare (<1%) and often signifies a terminal disease. Involvement of the skin has been thought to be through lymphatic spread by embolization or permeation, hematogenous spread, and implantation during surgery (port site in radical prostatectomy). We report a 74-year-old man on management for advanced prostate cancer with subcutaneous goserelin (Zoladex) but developed skin metastasis in the course of treatment. The skin metastasis in our patient, however, was initially localized to the site of the regions of subcutaneous goserelin injection that we imagined if there is a link between the two. We reviewed the literature and currently found no connection. Is there truly a link?Keywords: Goserelin, prostate cancer, skin metastasi