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Endocrinología, Diabetes y Nutrición (English ed.) Pembrolizumab-induced dual endocrine disruption: A case report
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Vol. 72. Issue 10.
(December 2025)
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Vol. 72. Issue 10.
(December 2025)
Review: About a case
Pembrolizumab-induced dual endocrine disruption: A case report
Disrupción endocrina dual inducida por pembrolizumab: reporte de un caso
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María Carmen Dameto Pons
Corresponding author
carmendameto@gmail.com

Corresponding author.
, Elena González Arnáiz, María Antequera González, Xavier F. Pérez Candel, Diana Ariadel Cobo, Javier Castañón Alonso, María D. Ballesteros Pomar
Servicio de Endocrinología y Nutrición, Complejo Asistencial Universitario de León, Gerencia de Salud de Castilla y León (SACYL), Altos de Nava s/n, 24071 León, Spain
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Abstract

Immunotherapy is an increasingly used treatment for different types of cancer. The most widely used are cytotoxic T-lymphocyte antigen 4 (CTLA-4) inhibitors, PD-1 ligand (PD-L1) inhibitors and PD-1 receptor inhibitors. All of them can produce endocrine autoimmune side effects in multiple organs. The most frequent are thyroid disorders and hypophysitis although, less frequently, they can also cause autoimmune adrenalitis and autoimmune diabetes. Thyroid involvement is usually transient but can become chronic in the form of hypothyroidism in more than 50% of cases. Diabetes is due to autoimmune destruction of pancreatic β-cells, in many cases abrupt and irreversible. The 2 entities occur more frequently with PD-1 or PD-L1 inhibitors. This is the case of a patient with cutaneous melanoma on pembrolizumab who simultaneously developed thyroiditis and fulminant autoimmune diabetes.

Keywords:
Autoimmune diabetes
Thyroiditis
Hypothyroidism
Immunotherapy
Pembrolizumab
Resumen

La inmunoterapia es un tratamiento cada vez más utilizado para distintos tipos de cáncer. Los más empleados son los inhibidores del antígeno 4 de los linfocitos T citotóxicos (CTLA-4), los inhibidores del ligando del PD-1 (PD-L1) y los inhibidores del receptor PD-1. Todos ellos pueden producir efectos secundarios autoinmunes endocrinos en múltiples órganos. Los más frecuentes son los trastornos tiroideos y la hipofisitis, aunque, con menor frecuencia, también pueden provocar adrenalitis y diabetes autoinmune. La afectación tiroidea suele ser transitoria, pero puede hacerse crónica en forma de hipotiroidismo en más del 50% de los casos. La diabetes se debe a la destrucción autoinmune de las células β pancreáticas, muchas veces de forma abrupta e irreversible. Ambas entidades suelen presentarse con los inhibidores del PD-1 o del PD-L1. Este es el caso de un paciente con melanoma cutáneo a tratamiento con pembrolizumab que desarrolló, concomitantemente, tiroiditis y diabetes autoinmune fulminante.

Palabras clave:
Diabetes autoinmune
Tiroiditis
Hipotiroidismo
Inmunoterapia
Pembrolizumab

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