Según un comunicado de prensa de GW Pharmaceuticals, el extracto de cannabis que contiene cantidades iguales de THC y CBD (denominado Sativex) es eficaz para el dolor provocado por el cáncer, según los resultados de un ensayo clínico en fase III. El extracto rico en THC no resultó mejor que el placebo.
El estudio, diseñado a doble ciego, incluyó a 177 pacientes con dolor severo de origen neoplásico y que no respondía totalmente a potentes medicamentos opiáceos (como la morfina). La tercera parte recibió Sativex, otra tercera el extracto rico en THC y el resto el placebo. Los medicamentos se administraron mediante un nebulizador bucal. Además de los fármacos a estudio, los pacientes continuaron tomando su medicación analgésica habitual.
El Sativex logró una mejoría estadísticamente significativa con respecto al placebo en el dolor (p=0.014). Aproximadamente el 40% de los pacientes incluidos en el grupo tratado con Sativex mostró una mejora analgésica de más del 30%. El otro compuesto estudiado, el extracto de THC de GW, no mostró efecto significativo (p=0.24). Por tanto los datos sugieren que de los productos estudiados en éste ensayo el Sativex es el más eficaz para el dolor provocado por el cáncer. Respecto a los efectos secundarios, los resultados mostraron que los principios analizados en general son bien tolerados.
“Estudiaremos a conciencia nuestros próximos pasos a dar, incluida la posibilidad de repetir un nuevo ensayo clínico en fase III que confirme los datos obtenidos por ahora, hasta asegurar la aprobación legal para el uso del Sativex en el dolor oncológico,” dijo el Dr. Stephen Wright, director del departamento de investigación y desarrollo de GW.
(Fuente: Comunicado de prensa de GW Pharmaceuticals del 19 de enero de 2005, www.gwpharm.com)
Cortesía de IACM
Asociación Internacional por el Cannabis como Medicamento
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