A mathematical model to calculate the index of risk of malignaney of tumors of the ovarian using the theory of fuzzy sets / Um modelo matematico para calcular o indice de risco de malignidade de tumores do ovario utilizando a teoria dos conjuntos fuzzy

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The ovarian cancer is the most lethal neoplasy of the femine genital system. It is necessary to do a precocious establishment of its diagnosis and a correct therapeutical approach to intervene in the natural history. With the intention to improve the methodology to distinguish benignancy from malignancy of the ovarian tumors methods?s associations had been studied. Jacobs et al. were the first authors to idealize the risk of malignance index for ovarian tumors, incorporating menopausal status, ultrasound findings and the serum level CA 125. In this work, a mathematical model is elaborated to auxiliary in the diferential diagnosis of the benignancy clinically restricted to the ovaries. The tool used to developed the model is the fuzzy sets theory for capacity in dealing with uncertainties. Inicially, input variables - menopausal status, ultrasound findings and CA 125 level ? and the system output variables - tumor?s type - they had been considered with linguistics variables and its values with fuzzy sets. The constructed model is more comprehensive than risk of malignancy index propose to Torres et al., therefore the menopausal status and the ultrasound findings are considered as a continuous variable. The system output, also continuous, give a gradual transition between benign and malignant tumor, what is more coherent with the reality

ASSUNTO(S)

cancer - modelos matematicos fuzzy sets modelos matematicos conjuntos difusos biomathematics cancer mathematical model biomatematica

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