Detección precoz del cáncer de próstata localizado. Valor diagnóstico de la relación PSA Libre / PSA Total.

Roberto O. Gentili, Freddy Romanelli, César Baccini, Francisco Álvarez Fourcade, Humberto Bogado

Resumen


Objetivos: Comprobar la utilidad clínica de la relación PSA Libre/PSA Total (PSAL/ PSAT) para seleccionar pacientes con mayor probabilidad de cáncer de próstata localizado (CAP). Optimizar la indicación de biopsia de próstata ecodirigida. Materiales y Métodos: Se analizaron 470 muestras de suero sanguíneo en las que se determinó la relación PSAL/PSAT. Los valores de PSAT se hallaban en un rango de 2-10mg/l. Del total de casos analizados, 242 pacientes con edad promedio de 67 años, contaron con estudios anátomo-patológicos que permitieron confirmar o descartar cáncer de próstata (CAP). Resultados: el 24,4% de los pacientes (59/242) presentó CAP. El 75,6% (183/242) tuvo patología benigna. En pacientes con PSAT entre 4,1-10 mg/l, el valor de “corte” utilizado fue 0,20, la sensibilidad de la prueba fue 94% y la reducción en el número de biopsias fue del 20%. Para pacientes con PSAT entre 2-4 mg/l, el valor de “corte” fue de 0,15 y la sensibilidad de la prueba fue 89%. La disminución del número biopsias fue de 64,5%. Conclusiones: Consideramos que las determinaciones de PSAT y de la relación PSAL/PSAT contribuyen eficazmente al diagnóstico precoz del cáncer de próstata localizado. Logra optimizar la indicación de biopsias de próstata ecodirigidas, consiguiendo una disminución del porcentaje de las mismas entre 20% y 33% en pacientes con PSAT entre 4,1-10 mg/l.


Palabras clave


cáncer de próstata; antígeno prostático libre y total; relación PSAL/PSAT; detección precoz

Texto completo:

71-79

Referencias


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