Resumen
Introducción: el lenvatinib pertenece al grupo farmacológico de los inhibidores de tirosina quinasa y fue aprobado en el año 2015 para tratar el cáncer de tiroides localmente avanzado o metastásico en progresión, refractario al tratamiento con yodo 131 (I-131).
Objetivo: presentar la reintroducción escalonada del lenvatinib para cáncer de tiroides metastásico refractario al I-131, después de suspensión por un evento adverso grave, logrando una respuesta imagenológica favorable con una dosis más baja de la usualmente recomendada.
Presentación del caso: mujer de 65 años con diagnóstico de cáncer papilar de tiroides metastásico, yodorrefractario, que, por intolerancia a sorafenib, requirió cambio de terapia a lenvatinib con dosis iniciales habituales, sin embargo, por efecto adverso severo fue suspendido y posteriormente reiniciado de manera escalonada, con lo que, a un año y medio después del uso de la dosis máxima tolerada, presentó una respuesta parcial en imágenes.
Discusión y conclusión: los efectos adversos del uso de lenvatinib suelen requerir suspensión del medicamento o disminución de su dosis de manera temporal. Diferentes estudios han demostrado una relación dosis dependiente, tanto de los desenlaces clínicos como de los eventos adversos. No existe un consenso en la manera de reinicio o escalonamiento de la dosis de lenvatinib después de un efecto adverso, sin embargo, es fundamental que esto se lleve a cabo de manera individualizada y con un equipo multidisciplinario, considerando los riesgos y beneficios para alcanzar la dosis máxima tolerada.
Citas
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