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  • Title: Serum soluble fas level as a prognostic factor in patients with gynecological malignancies.
    Author: Konno R, Takano T, Sato S, Yajima A.
    Journal: Clin Cancer Res; 2000 Sep; 6(9):3576-80. PubMed ID: 10999747.
    Abstract:
    The Fas-Fas ligand system is important in apoptosis mediated by CTLs and natural killer cells. The suppression of apoptosis contributes to carcinogenesis, as well as to a resistance to chemotherapy and radiotherapy. Circulating soluble Fas (sFas), which is generated by alternative mRNA splicing, can antagonize cell-surface Fas function. We investigated sFas levels in 64 patients with gynecological malignancies (28 cervical carcinomas, 18 endometrial carcinomas, and 18 ovarian carcinomas) and in 24 healthy female donors by using a Fas-specific ELISA. In each carcinoma group, serum sFas demonstrated a statistically significant elevation relative to levels in normal controls (P < 0.0001). Levels of serum sFas in patients with advanced cancer (FIGO stages III and IV) significantly exceeded those in patients with localized cancer (FIGO stages I and II) or those in normal control subjects (P < 0.0001). We divided the patients into two groups based on the level of serum sFas and examined the relationship between serum sFas levels and survival. No deaths occurred in the groups with cervical and endometrial cancer with a serum sFas level < 1.5 ng/ml. Survival rates in groups with cervical carcinoma, endometrial carcinoma, and ovarian carcinoma with a serum sFas level < 1.5 ng/ml exceeded those in groups with sFas levels of 21.5 ng/ml (P < 0.001, P = 0.128, and P = 0.012, respectively). Proportional hazard models demonstrated that serum sFas level was a statistically significant factor (P = 0.0196) for survival, as well as histological grade (P = 0.0168) in ovarian carcinoma.
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