“…In our analysis, we have only found four previously reported cases with a malignant cutaneous or subcutaneous tumor functioning as the recipient. One case was a melanoma that metastasized into a basal cell carcinoma, 11 one showed metastatic breast carcinoma within myxoid liposarcoma, 14 one showed metastatic pulmonary adenocarcinoma within basal cell carcinoma 17 and one showed gastric signet-ring carcinoma secondarily involving basal cell carcinoma. 18 Gastric adenocarcinoma represents the most common malignancy to assume signet-ring morphology, although virtually any adenocarcinoma may show foci of signet-ring cell change.…”