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An adenocarcinoma which arose in a dermoid cyst of the ovary displayed areas of melanocyte colonization and pigmentation. Ultrastructural study revealed the presence of epithelial tumour cells and melanocytes; many tumour cells contained compound melanosomes, but not premelanosomes, suggesting transfer of melanin from melanocytes to tumour cells. Melanocyte colonization of malignant tumours is a curious phenomenon the significance of which remains to be elucidated.
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Waxman et al. (1986) studied this question.
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