Twenty-eight undifferentiated basal-cell carcinomas were studied electron microscopically and histochemically. It is established that the cells of which the tumours are formed, retain a number of tissue- and cell-specific features of the epidermis and skin appendages cells. 4 groups of undifferentiated basal-cell carcinoma are distinguished on the basis of this study that histogenetically are connected with the cells of epidermis, hair follicle, secretory parts of the eccrine sweat or sebaceous glands respectively.
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