{"id":1264,"date":"2026-07-22T15:38:52","date_gmt":"2026-07-22T13:38:52","guid":{"rendered":"https:\/\/infoimasd.com\/?p=1264"},"modified":"2026-07-22T15:38:53","modified_gmt":"2026-07-22T13:38:53","slug":"analisis-sangre-alzheimer-biomarcador-p-tau217","status":"publish","type":"post","link":"https:\/\/infoimasd.com\/index.php\/2026\/07\/22\/analisis-sangre-alzheimer-biomarcador-p-tau217\/","title":{"rendered":"Un an\u00e1lisis de sangre permite estimar el riesgo de alzh\u00e9imer hasta diez a\u00f1os antes de los primeros s\u00edntomas"},"content":{"rendered":"\n<p class=\"has-medium-font-size wp-block-paragraph\">Un equipo de investigadores del Centro de Investigaci\u00f3n de Enfermedades Neurol\u00f3gicas (CIEN) y la Fundaci\u00f3n Reina Sof\u00eda ha demostrado que <strong>un an\u00e1lisis de sangre puede estimar el riesgo de desarrollar deterioro cognitivo hasta una d\u00e9cada antes de la aparici\u00f3n de los primeros s\u00edntomas del alzh\u00e9imer.<\/strong> El hallazgo stima el riesgo de progresi\u00f3n cl\u00ednica y, sobre todo, descarta con gran fiabilidad a quienes tienen un riesgo muy bajo de sufrirlo. Los resultados, publicados en la revista <em><a href=\"https:\/\/alz-journals.onlinelibrary.wiley.com\/doi\/10.1002\/alz.71599\" data-type=\"link\" data-id=\"https:\/\/alz-journals.onlinelibrary.wiley.com\/doi\/10.1002\/alz.71599\">Alzheimer&#8217;s &amp; Dementia<\/a><\/em>, representan un importante avance en la detecci\u00f3n precoz de las enfermedades neurodegenerativas y abren nuevas posibilidades para la medicina preventiva.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">El estudio es fruto de un proyecto iniciado <strong>hace doce a\u00f1os cuando los investigadores comenzaron el seguimiento de 982 personas cognitivamente sanas<\/strong> de la Comunidad de Madrid en el bautizado como Proyecto Vallecas. El objetivo era identificar marcadores biol\u00f3gicos capaces de anticipar qu\u00e9 individuos ten\u00edan mayor probabilidad de desarrollar deterioro cognitivo leve o demencia antes de que aparecieran manifestaciones cl\u00ednicas. Los cient\u00edficos han comprobado q<strong>ue un biomarcador presente en la sangre puede ofrecer informaci\u00f3n muy precisa sobre la evoluci\u00f3n cl\u00ednica de estas personas<\/strong> muchos a\u00f1os antes de que aparezcan los primeros s\u00edntomas.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>La clave del estudio reside en un biomarcador sangu\u00edneo denominado %p-tau217<\/strong> cuya medici\u00f3n permite clasificar a las personas seg\u00fan su riesgo de desarrollar deterioro cognitivo mediante una prueba m\u00ednimamente invasiva. A diferencia de otras t\u00e9cnicas utilizadas para detectar la enfermedad, como la punci\u00f3n lumbar o determinadas pruebas de imagen, el an\u00e1lisis de sangre resulta mucho m\u00e1s sencillo, accesible y econ\u00f3mico, lo que facilitar\u00eda su incorporaci\u00f3n a la pr\u00e1ctica cl\u00ednica si futuras investigaciones confirman estos resultados.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-rich is-provider-x wp-block-embed-x\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"twitter-tweet\" data-width=\"500\" data-dnt=\"true\"><p lang=\"en\" dir=\"ltr\">Research from <a href=\"https:\/\/x.com\/hashtag\/AAIC26?src=hash&amp;ref_src=twsrc%5Etfw\">#AAIC26<\/a> shows progress across Alzheimer&#39;s\u2014from promising tau research and blood tests to risk reduction. As Dr. Maria Carrillo said, &quot;We&#39;re beginning to prepare for what that future is going to look like, and it&#39;s exciting.&quot; Via <a href=\"https:\/\/x.com\/TIME?ref_src=twsrc%5Etfw\">@TIME<\/a>: <a href=\"https:\/\/t.co\/Ygt9JupdVE\">https:\/\/t.co\/Ygt9JupdVE<\/a>.<\/p>&mdash; Alzheimer&#39;s Association (@alzassociation) <a href=\"https:\/\/x.com\/alzassociation\/status\/2077750902245539985?ref_src=twsrc%5Etfw\">July 16, 2026<\/a><\/blockquote><script async src=\"https:\/\/platform.x.com\/widgets.js\" charset=\"utf-8\"><\/script>\n<\/div><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Un resultado negativo permite descartar la enfermedad con m\u00e1s del 90% de fiabilidad<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Seg\u00fan explica Jes\u00fas Silva Rodr\u00edguez, responsable de la Plataforma de Neuroimagen del CIEN y coordinador del estudio, el principal valor del biomarcador <strong>no consiste en confirmar qui\u00e9n desarrollar\u00e1 <a href=\"https:\/\/infoimasd.com\/index.php\/2026\/07\/19\/csic-interferon-alzheimer-mujeres-neuroinflamacion\/\" data-type=\"post\" data-id=\"1175\">alzh\u00e9imer<\/a>, sino en identificar con una elevada fiabilidad a quienes tienen un riesgo muy bajo de padecerla.<\/strong> Los resultados muestran que un an\u00e1lisis negativo permite descartar la aparici\u00f3n de s\u00edntomas cl\u00ednicos durante los diez a\u00f1os siguientes con una fiabilidad superior al 90%. Esta capacidad de exclusi\u00f3n podr\u00eda transformar la gesti\u00f3n cl\u00ednica de las enfermedades neurodegenerativas, evitando pruebas invasivas y costosas en pacientes con un riesgo m\u00ednimo. Algo que, a su vez, permite concentrar los recursos sanitarios en quienes realmente necesitan un seguimiento m\u00e1s estrecho.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Eso s\u00ed, los investigadores subrayan que un resultado positivo no debe interpretarse como un diagn\u00f3stico definitivo. Entre los participantes clasificados como de mayor riesgo, la probabilidad de desarrollar deterioro cognitivo leve o demencia fue del 55% a los cinco a\u00f1os y del 72% a los diez a\u00f1os. Aunque estas cifras multiplican entre cuatro y siete veces el riesgo medio de la poblaci\u00f3n estudiada, tambi\u00e9n muestran que <strong>una parte importante de las personas con niveles elevados del biomarcador nunca lleg\u00f3 a desarrollar s\u00edntomas durante el periodo analizado.<\/strong> Durante el seguimiento, el 16,2% de los participantes evolucion\u00f3 hacia un deterioro cognitivo leve o una demencia, mientras que el 6,7% desarroll\u00f3 espec\u00edficamente demencia, unos porcentajes acordes con la incidencia esperada para ese grupo de edad.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Un cambio de paradigma en la investigaci\u00f3n del alzh\u00e9imer<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Hasta ahora, los biomarcadores sangu\u00edneos permit\u00edan detectar con gran precisi\u00f3n la acumulaci\u00f3n de prote\u00ednas relacionadas con el <a href=\"https:\/\/infoimasd.com\/index.php\/2026\/07\/09\/microtrombos-cerebrales-alzheimer-deteccion-neuroimagen-cnic-csic\/\" data-type=\"post\" data-id=\"1025\">alzh\u00e9imer,<\/a> como la beta amiloide o la prote\u00edna tau. Sin embargo, exist\u00edan muchas dudas sobre c\u00f3mo interpretar esos resultados en personas que a\u00fan no presentaban s\u00edntomas. El nuevo trabajo aporta una dimensi\u00f3n adicional al<strong> demostrar que estos biomarcadores tambi\u00e9n pueden utilizarse para estimar el riesgo real de evoluci\u00f3n cl\u00ednica a largo plazo,<\/strong> proporcionando una herramienta mucho m\u00e1s \u00fatil para la medicina preventiva. Seg\u00fan Pascual S\u00e1nchez-Juan, director cient\u00edfico del CIEN y autor s\u00e9nior del estudio, este avance supone un cambio importante porque los biomarcadores dejan de limitarse a identificar la biolog\u00eda de la enfermedad y pasan a ofrecer informaci\u00f3n sobre la probabilidad de desarrollar s\u00edntomas en el futuro.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Aplicaciones para la prevenci\u00f3n y los ensayos cl\u00ednicos<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Los autores consideran que este avance tendr\u00e1 un impacto directo tanto en la investigaci\u00f3n como en la pr\u00e1ctica cl\u00ednica. Por una parte, <strong>permitir\u00e1 seleccionar con mayor precisi\u00f3n a los candidatos ideales para participar en ensayos cl\u00ednicos<\/strong> dirigidos a prevenir el alzh\u00e9imer antes de la aparici\u00f3n de s\u00edntomas. Por otra, <strong>facilitar\u00e1 un seguimiento personalizado<\/strong> de las personas con mayor riesgo para que puedan acceder a tratamientos en cuanto cumplan los criterios cl\u00ednicos establecidos. El biomarcador representa un paso decisivo hacia una medicina m\u00e1s personalizada y preventiva. Disponer de herramientas sencillas para identificar a las personas que m\u00e1s pueden beneficiarse de una intervenci\u00f3n temprana podr\u00eda transformar el abordaje de una de las enfermedades m\u00e1s frecuentes del envejecimiento.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un equipo del Centro de Investigaci\u00f3n de Enfermedades Neurol\u00f3gicas (CIEN) demuestra que un an\u00e1lisis de sangre basado en el biomarcador %p-tau217 permite estimar el riesgo de desarrollar deterioro cognitivo hasta una d\u00e9cada antes de la aparici\u00f3n de los primeros s\u00edntomas del alzh\u00e9imer, un avance que podr\u00eda mejorar el cribado, el seguimiento cl\u00ednico y la selecci\u00f3n de pacientes para ensayos de prevenci\u00f3n.<\/p>\n","protected":false},"author":1,"featured_media":1267,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[11],"tags":[397,536,534,533,460,535],"class_list":["post-1264","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-investigacion","tag-alzheimer","tag-alzheimers-dementia-magazine","tag-biomarcadores","tag-cien","tag-neurociencia","tag-p-tau217"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Un an\u00e1lisis de sangre permite estimar el riesgo de alzh\u00e9imer hasta diez 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