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  • Title: Survival in synovial sarcoma. A multivariate study of prognostic factors with special emphasis on the comparison between early death and long-term survival.
    Author: Oda Y, Hashimoto H, Tsuneyoshi M, Takeshita S.
    Journal: Am J Surg Pathol; 1993 Jan; 17(1):35-44. PubMed ID: 8383468.
    Abstract:
    A retrospective study of 56 patients with synovial sarcoma was done to search for possible prognostic factors affecting survival. In a univariate analysis, age (> or = 20 years), site (proximal), large tumor size (> or = 5 cm), mitotic rate of more than 15 per 10 per high-power fields (hpf), high nuclear grade, tumor necrosis of more than 50%, the presence of rhabdoid cells, a small number of mast cells (< 20/10 hpf), and a high stage according to the criteria of the American Joint Committee (AJC) staging of soft tissue sarcoma, significantly decreased survival (log-rank test; p < 0.05). Moreover, when comparing the 10-year survival (11 patients) and the deaths within 1 year (12 patients), size, high nuclear grade, presence of rhabdoid cells, tumor necrosis, and stage were all considered to be significant prognostic factors (two-sided chi-square test; p < 0.01). In a multivariate analysis (Cox's model), stage was the only strong predictor of a poor prognosis (p = 0.011). We therefore concluded that large tumor size, high nuclear grade, the presence of rhabdoid cells, extensive tumor necrosis, and a high AJC stage were adverse prognostic factors in synovial sarcoma.
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