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The case is presented of a 26-year-old woman with myxoid liposarcoma of the right breast who developed a relapse with anaplastic spindle-cell mesenchymal tumor 7 months after primary therapy. Additionally, 13 months later a bilateral adeno-carcinoma of differing histological grade occurred in the breasts. To the best of our knowledge, no comparable sarcoma-carcinoma sequence in the mammary gland has been reported. For this reason this case is discussed, with special emphasis on possible causative factors and the relationship to the Li-Fraumeni syndrome.
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