Impacto de las estatinas en pacientes con cáncer de próstata resistente a la castración en tratamiento con abiraterona
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2021
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Abstract
Introducción y objetivos. El cáncer de próstata resistente a la castración (CPRC) tiene un carácter hormono-dependiente que permite tratamiento con acetato de abiraterona (AA), un inhibidor de la producción de andrógenos. Las estatinas son unos fármacos que bloquean la síntesis de colesterol, molécula precursora de hormonas sexuales. El tratamiento con estatinas parece impactar beneficiosamente en la supervivencia de pacientes con CPRC. El objetivo principal es determinar el efecto de las estatinas en supervivencia global en pacientes con CPRC pertenecientes a ensayos clínicos aleatorizados a un tratamiento con AA o placebo. Los objetivos secundarios son estimar el efecto de las estatinas en supervivencia libre de progresión radiográfica (RPFS) y tiempo hasta la progresión de PSA (TTPP) en los mismos pacientes.
Metodología. Se lleva a cabo un estudio post hoc de los datos de los ensayos clínicos COU-AA-301 y COU-AA-302, ajustando distintos modelos de análisis de supervivencia.
Resultados. En población por intención de tratar (ITT) en COU-AA-301 las estatinas redujeron el riesgo de muerte en un 18% (HR 0.82 IC95% [0.71;0.94], p-valor 0.005) y el riesgo de progresión radiográfica en un 19% (HR 0.0.81 IC95% [0.68;0.97], p-valor 0.02). En población por protocolo (PP) de COU-AA-301 y en COU-AA-302, estos hallazgos no se corroboran. Las estatinas no influyen en TTPP. En ningún modelo la interacción entre tratamiento y estatina era significativa.
Conclusiones. Las estatinas reducen el riesgo de evento de muerte por cualquier causa y progresión radiográfica en COU-AA-301 población por ITT, pero no en COU-AA-301 población por PP ni en COU-AA-302.
Introduction and objectives. Castration-resistant prostate cancer (CRPC) has a hormone-dependent nature that allows treatment with abiraterone acetate (AA), an inhibitor of androgen production. Statins are drugs that block the synthesis of cholesterol, precursor of sex hormones. Statin therapy seems to have a beneficial impact on survival in patients with CRPC. The primary objective is to determine the effect of statins on overall survival (OS) in patients with CRPC in clinical trials randomised to treatment with AA or placebo. The secondary objectives are to estimate the effect of statins on radiographic progression-free survival (RPFS) and time to PSA progression (TTPP) in the same patients. Methodology. A post hoc study of the data from clinical trials COU-AA-301 and COU-AA-302 is carried out, fitting different survival analysis models. Results. In the intention-to-treat (ITT) population in COU-AA-301 statins reduced the risk of death by 18% (HR 0.82 CI95% [0.71;0.94], p-value 0.005) and the risk of radiographic progression by 19% (HR 0.81 CI95% [0.68;0.97], p-value 0.02). In the per protocol (PP) population of COU-AA-301 and in COU-AA-302, these findings are not corroborated. Statins do not influence TTPP. In no model the interaction between treatment and statin was significant. Conclusions. Statins reduce the risk of any cause death and radiographic progression in COU-AA-301 ITT population, but not in COU-AA-301 PP population nor in COU-AA-302.
Introduction and objectives. Castration-resistant prostate cancer (CRPC) has a hormone-dependent nature that allows treatment with abiraterone acetate (AA), an inhibitor of androgen production. Statins are drugs that block the synthesis of cholesterol, precursor of sex hormones. Statin therapy seems to have a beneficial impact on survival in patients with CRPC. The primary objective is to determine the effect of statins on overall survival (OS) in patients with CRPC in clinical trials randomised to treatment with AA or placebo. The secondary objectives are to estimate the effect of statins on radiographic progression-free survival (RPFS) and time to PSA progression (TTPP) in the same patients. Methodology. A post hoc study of the data from clinical trials COU-AA-301 and COU-AA-302 is carried out, fitting different survival analysis models. Results. In the intention-to-treat (ITT) population in COU-AA-301 statins reduced the risk of death by 18% (HR 0.82 CI95% [0.71;0.94], p-value 0.005) and the risk of radiographic progression by 19% (HR 0.81 CI95% [0.68;0.97], p-value 0.02). In the per protocol (PP) population of COU-AA-301 and in COU-AA-302, these findings are not corroborated. Statins do not influence TTPP. In no model the interaction between treatment and statin was significant. Conclusions. Statins reduce the risk of any cause death and radiographic progression in COU-AA-301 ITT population, but not in COU-AA-301 PP population nor in COU-AA-302.