An Analysis Based on Hazard Model for Tumor Status of the Uterine Cervix

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Six prognostic factors of tumor status of the uterine cervix at the first examination: FIGO classification, the growth type of tumor, the size of tumor at portio, the size of uterus (including cervix and body), the tumor infiltration to parametrium and the tumor infiltration to vaginal wall, were analyzed on the basis of the hazard model. Each prognostic factor was classified into four to six categories. Instead of covariate and parameter, a prognostic index which indicates the degree of the effect on the prognosis for category was applied to the hazard model. The category is arranged with the influence order of the effect on the prognosis (IOEP) according to comparison among the prognostic indexes. Nine hundred and eighty nine primary cases treated with irradiation alone at the National Institute of Radiological Sciences were applied to this study. The FIGO classification and the size of the uterus showed a great influence on the prognosis. On the other hand, the tumor infiltration to vaginal wall brought the smallest influence. The IOEP based on the prognostic index agreed with the clinical observation except a few categories of the tumor infiltration to vaginal wall.

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