<unk>  <unk>  is a rare non-hereditary neoplasm of the dermis layer of the skin which is sometimes described as having the tentacles growing into the surrounding fat, muscle and even bone and is therefore, classified as a soft tissue sarcoma. In many respects, the disease behaves as a benign tumor, but in 2-5% of cases it can metastasize, so it should be considered to have a malignant potential. Over 95% of<unk>  tumors have the chromosomal translocation t(17;22). The translocation fuses the collagen gene (COL1A1) with the platelet-derived growth factor gene. The fibroblast, the cell of origin of this tumor, expresses the fusion gene in the belief that it is collagen. However, the resulting fusion protein is processed into mature platelet-derived growth factor which is a potent growth factor. Fibroblasts contain the receptor for this growth factor. Thus, the cell "thinks" it is producing a structural protein, but in fact produces a self-stimulatory growth signal. The cell divides rapidly and a tumor forms. In<unk> , the tumor has a tendency to return after being removed. However, it does not often metastasize to other parts of the body.
Dermatofibrosarcoma protuberans
Dermatofibroma
Elastofibroma
Angiokeratoma
Lymphangioma circumscriptum
Sarcoma botryoides
Trichoepithelioma
Basal cell carcinoma