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  • Title: Morphologic features of prognostic significance in uterine smooth muscle tumors: a review of eighty-four cases.
    Author: Burns B, Curry RH, Bell ME.
    Journal: Am J Obstet Gynecol; 1979 Sep 01; 135(1):109-14. PubMed ID: 474641.
    Abstract:
    Independent microscopic review of the most cellular and pleomorphic areas of 84 smooth muscle tumors of the uterus by two pathologists yielded 23 leiomyosarcomas, 43 cellular leiomyomas, 16 bizarre leiomyomas, and two intravenous leiomyomas. Greater than 5 mitotic figures/10 high-power fields (hpf) correlated with malignant clinical behavior, but this occurred in only 75% of the leiomyosarcomas. Five cases with fewer than 5 mitoses/10 hpf pursued a malignant course. The mean age of the patients with malignant tumors (52.5 years) was similar to the mean age of those with bizarre leiomyomas (48.0 years) but those patients with cellular leiomyomas were significantly younger (42.0 years; p less than 0.01). Gross evidence of extrauterine extension was diagnostic of malignancy as was vascular invasion by anaplastic tumor. Fifteen of the 19 patients with leiomyosarcoma died of disease at an average of 28 months postoperatively. Inadequate sampling and interobserver variation are discussed.
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