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Website by Central States Marketing second opinion request your expert second opinion focused on finding a cure insights from the National Cancer Institute where your donations go focused on finding a cure focused on finding a cure focused on finding a cure What is Gynecological Carcinosarcoma. Gynecological Carcinosarcoma GCS is a rare and aggressive cancer found primarily in the ovaries and uterus and can also originate in the fallopian tubes and vagina. GCS is also known as MMMT or Malignant Mixed Mullerian Tumor. Carcinosarcoma is unique in that it contains two types of cells Carcinomatous epithelial tissue and sarcomatous connective tissue.