{"id":3287,"date":"2026-04-07T14:55:26","date_gmt":"2026-04-07T12:55:26","guid":{"rendered":"https:\/\/biomol.es\/?p=3287"},"modified":"2026-04-07T14:55:27","modified_gmt":"2026-04-07T12:55:27","slug":"ctcs-biopsia-liquida-oncologia-precisao","status":"publish","type":"post","link":"https:\/\/biomol.es\/pt-pt\/ctcs-biopsia-liquida-oncologia-precisao\/","title":{"rendered":"CTCs e bi\u00f3psia l\u00edquida: tecnologia chave na oncologia de precis\u00e3o"},"content":{"rendered":"\n<p>A bi\u00f3psia l\u00edquida consolidou-se como uma ferramenta central na oncologia translacional. Embora a an\u00e1lise de cfDNA tenha alcan\u00e7ado uma r\u00e1pida integra\u00e7\u00e3o cl\u00ednica, as <strong>C\u00e9lulas Tumorais Circulantes (CTCs)<\/strong> representam um analito biologicamente mais complexo: c\u00e9lulas intactas, vi\u00e1veis, com potencial para caracteriza\u00e7\u00e3o gen\u00f3mica, transcript\u00f3mica, prote\u00f3mica e funcional em tempo real.<\/p>\n\n\n\n<p>O principal desafio tem sido metodol\u00f3gico. A baixa frequ\u00eancia de CTCs no sangue perif\u00e9rico (1\u201310 c\u00e9lulas por mL) exige tecnologias capazes de as isolar com elevada efici\u00eancia, preservando a sua integridade estrutural e molecular.<\/p>\n\n\n\n<p>O sistema Parsortix\u00ae foi desenvolvido com base neste princ\u00edpio: uma tecnologia microflu\u00eddica independente de ep\u00edtopos que permite a captura baseada em propriedades f\u00edsicas, recupera\u00e7\u00e3o celular vi\u00e1vel e posterior an\u00e1lise downstream com m\u00faltiplas aplica\u00e7\u00f5es.<\/p>\n\n\n\n<p>Em paralelo, o campo das CTCs est\u00e1 a atravessar uma evolu\u00e7\u00e3o conceptual rumo a modelos de integra\u00e7\u00e3o cl\u00ednica mais definidos.<\/p>\n\n\n\n<h2 class=\"c-title-2 wp-block-heading\"><strong>Consenso internacional 2025: consolida\u00e7\u00e3o cl\u00ednica e redefini\u00e7\u00e3o funcional<\/strong><\/h2>\n\n\n\n<p>Em 2025, um painel internacional de especialistas publicou no <em>European Journal of Cancer<\/em> um consenso estruturado sobre a integra\u00e7\u00e3o cl\u00ednica das CTCs em tumores s\u00f3lidos.<\/p>\n\n\n\n<p>As conclus\u00f5es estabelecem que:<\/p>\n\n\n\n<p>\u2022 Existe evid\u00eancia suficiente para o uso cl\u00ednico das CTCs na doen\u00e7a metast\u00e1tica, particularmente no cancro da mama e da pr\u00f3stata.<br>\u2022 A enumera\u00e7\u00e3o constitui um biomarcador progn\u00f3stico validado neste contexto.<br>\u2022 A pr\u00f3xima fase do desenvolvimento cl\u00ednico dever\u00e1 centrar-se na caracteriza\u00e7\u00e3o fenot\u00edpica e molecular.<br>\u2022 A integra\u00e7\u00e3o com ctDNA representa um eixo estrat\u00e9gico para o avan\u00e7o do campo.<br>\u2022 As tecnologias independentes de antig\u00e9nios ganham relev\u00e2ncia neste processo de transi\u00e7\u00e3o.<\/p>\n\n\n\n<p>Este consenso consolida a validade cl\u00ednica das CTCs na doen\u00e7a avan\u00e7ada e estabelece um enquadramento conceptual orientado para a caracteriza\u00e7\u00e3o molecular e funcional como pr\u00f3xima fase evolutiva.<\/p>\n\n\n\n<h2 class=\"c-title-2 wp-block-heading\"><strong>Captura microflu\u00eddica baseada em tamanho e deformabilidade<\/strong><\/h2>\n\n\n\n<p>A arquitetura tecnol\u00f3gica do Parsortix alinha-se com esta abordagem ao priorizar a recupera\u00e7\u00e3o de c\u00e9lulas intactas e analiticamente explor\u00e1veis.<\/p>\n\n\n\n<p>O Parsortix baseia o seu princ\u00edpio de separa\u00e7\u00e3o no tamanho e na deformabilidade celular. O cassete microflu\u00eddico incorpora uma redu\u00e7\u00e3o progressiva do canal at\u00e9 atingir um \u201ccritical gap\u201d, onde as c\u00e9lulas hematol\u00f3gicas atravessam o sistema, enquanto as c\u00e9lulas tumorais, geralmente maiores e menos deform\u00e1veis, ficam retidas.<\/p>\n\n\n\n<p>Esta abordagem \u00e9 particularmente relevante no contexto da heterogeneidade tumoral.<\/p>\n\n\n\n<h2 class=\"c-title-2 wp-block-heading\"><strong>Heterogeneidade tumoral e transi\u00e7\u00e3o epit\u00e9lio-mes\u00eanquima (EMT)<\/strong><\/h2>\n\n\n\n<p>As CTCs n\u00e3o constituem uma popula\u00e7\u00e3o uniforme. Durante processos como a transi\u00e7\u00e3o epit\u00e9lio-mes\u00eanquima (EMT), podem perder marcadores epiteliais cl\u00e1ssicos e adquirir fen\u00f3tipos mesenquimais ou h\u00edbridos.<\/p>\n\n\n\n<p>A captura independente de ep\u00edtopos permite recuperar:<\/p>\n\n\n\n<p>\u2022 CTCs epiteliais<br>\u2022 CTCs mesenquimais<br>\u2022 estados interm\u00e9dios de EMT<br>\u2022 clusters tumorais<\/p>\n\n\n\n<p>Preservando assim a diversidade fenot\u00edpica e potencialmente funcional da popula\u00e7\u00e3o circulante.<\/p>\n\n\n\n<h2 class=\"c-title-2 wp-block-heading\"><strong>De biomarcador progn\u00f3stico a ferramenta de estratifica\u00e7\u00e3o terap\u00eautica<\/strong><\/h2>\n\n\n\n<p>O consenso internacional evidencia uma transi\u00e7\u00e3o conceptual:<\/p>\n\n\n\n<p>\u2022 Na pr\u00e1tica atual, a enumera\u00e7\u00e3o de CTCs tem utilidade progn\u00f3stica validada na doen\u00e7a metast\u00e1tica.<br>\u2022 No futuro, a caracteriza\u00e7\u00e3o molecular e proteica ser\u00e1 determinante para prever a resposta terap\u00eautica e orientar a sele\u00e7\u00e3o de tratamentos.<br>\u2022 A avalia\u00e7\u00e3o da express\u00e3o de biomarcadores como HER2, TROP2, PD-L1, PSMA ou c-MET nas CTCs \u00e9 identificada como uma linha priorit\u00e1ria para o avan\u00e7o da medicina personalizada.<\/p>\n\n\n\n<p>Do ponto de vista biol\u00f3gico, as CTCs apresentam vantagens claras face ao ctDNA:<\/p>\n\n\n\n<p>\u2022 material tumoral celular<br>\u2022 possibilidade de an\u00e1lise single-cell<br>\u2022 avalia\u00e7\u00e3o simult\u00e2nea de ADN, ARN e prote\u00ednas<br>\u2022 caracteriza\u00e7\u00e3o clonal e subclonal<br>\u2022 potencial para estudos funcionais<\/p>\n\n\n\n<p>Ao permitir a recupera\u00e7\u00e3o de c\u00e9lulas vi\u00e1veis, o Parsortix facilita a transi\u00e7\u00e3o da dete\u00e7\u00e3o quantitativa para a caracteriza\u00e7\u00e3o multi-\u00f3mica integrada.<\/p>\n\n\n\n<h2 class=\"c-title-2 wp-block-heading\"><strong>Complementaridade biol\u00f3gica com ctDNA<\/strong><\/h2>\n\n\n\n<p>O consenso sublinha que as CTCs e o ctDNA representam analitos biologicamente complementares.<\/p>\n\n\n\n<p>O ctDNA reflete fragmentos de ADN libertados para a corrente sangu\u00ednea, predominantemente derivados de apoptose ou necrose tumoral.<br>Por outro lado, as CTCs s\u00e3o c\u00e9lulas intactas, com arquitetura preservada e contexto biol\u00f3gico completo.<\/p>\n\n\n\n<p>A integra\u00e7\u00e3o de ambos os analitos pode:<\/p>\n\n\n\n<p>\u2022 aumentar a sensibilidade na doen\u00e7a m\u00ednima residual (MRD)<br>\u2022 refinar modelos progn\u00f3sticos<br>\u2022 ampliar a propor\u00e7\u00e3o de doentes avali\u00e1veis<br>\u2022 fornecer informa\u00e7\u00e3o biol\u00f3gica n\u00e3o redundante<\/p>\n\n\n\n<p>A arquitetura do Parsortix permite implementar este modelo multimodal atrav\u00e9s de:<\/p>\n\n\n\n<p>\u2022 separa\u00e7\u00e3o de plasma para an\u00e1lise de cfDNA<br>\u2022 captura celular subsequente no mesmo fluxo de processamento<br>\u2022 an\u00e1lise molecular e proteica downstream<\/p>\n\n\n\n<p>Configura-se assim um modelo integrado de bi\u00f3psia l\u00edquida baseado na complementaridade biol\u00f3gica entre analitos celulares e acelulares.<\/p>\n\n\n\n<h2 class=\"c-title-2 wp-block-heading\"><strong>Doen\u00e7a precoce e monitoriza\u00e7\u00e3o de MRD<\/strong><\/h2>\n\n\n\n<p>Na doen\u00e7a n\u00e3o metast\u00e1tica, o consenso reconhece que a utilidade cl\u00ednica ainda n\u00e3o est\u00e1 estabelecida, embora exista evid\u00eancia s\u00f3lida de validade biol\u00f3gica, particularmente no cancro da mama precoce.<\/p>\n\n\n\n<p>As principais limita\u00e7\u00f5es incluem:<\/p>\n\n\n\n<p>\u2022 baixa frequ\u00eancia de CTCs<br>\u2022 variabilidade pr\u00e9-anal\u00edtica e anal\u00edtica<br>\u2022 necessidade de maior sensibilidade e reprodutibilidade<\/p>\n\n\n\n<p>O desenvolvimento de estudos prospetivos multic\u00eantricos, juntamente com a harmoniza\u00e7\u00e3o metodol\u00f3gica, ser\u00e1 determinante para traduzir esta validade biol\u00f3gica em utilidade cl\u00ednica comprovada.<\/p>\n\n\n\n<h2 class=\"c-title-2 wp-block-heading\"><strong>Alinhamento com prioridades estrat\u00e9gicas do campo<\/strong><\/h2>\n\n\n\n<p>O consenso define como prioridades:<\/p>\n\n\n\n<p>\u2022 padroniza\u00e7\u00e3o de protocolos pr\u00e9-anal\u00edticos e anal\u00edticos<br>\u2022 integra\u00e7\u00e3o estruturada com ctDNA<br>\u2022 caracteriza\u00e7\u00e3o de biomarcadores terap\u00eauticos priorit\u00e1rios<br>\u2022 gera\u00e7\u00e3o de evid\u00eancia cl\u00ednica robusta<br>\u2022 desenvolvimento de ensaios prospetivos orientados por biomarcadores<\/p>\n\n\n\n<p>Neste contexto, a captura celular constitui apenas a fase inicial do processo anal\u00edtico. O objetivo final \u00e9 a obten\u00e7\u00e3o de informa\u00e7\u00e3o biol\u00f3gica com relev\u00e2ncia funcional e potencial translacional.<\/p>\n\n\n\n<p>Neste cen\u00e1rio, o Parsortix n\u00e3o representa apenas uma tecnologia de enriquecimento celular, mas uma plataforma anal\u00edtica que integra captura, viabilidade e caracteriza\u00e7\u00e3o multi-\u00f3mica num \u00fanico fluxo experimental, ampliando o alcance biol\u00f3gico da bi\u00f3psia l\u00edquida.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A bi\u00f3psia l\u00edquida consolidou-se como uma ferramenta central na oncologia translacional. Embora a an\u00e1lise de cfDNA tenha alcan\u00e7ado uma r\u00e1pida integra\u00e7\u00e3o cl\u00ednica, as C\u00e9lulas Tumorais Circulantes (CTCs) representam um analito biologicamente mais complexo: c\u00e9lulas intactas, vi\u00e1veis, com potencial para caracteriza\u00e7\u00e3o gen\u00f3mica, transcript\u00f3mica, prote\u00f3mica e funcional em tempo real. O principal desafio tem sido metodol\u00f3gico. A &hellip;<\/p>\n","protected":false},"author":13,"featured_media":3288,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[38,39],"tags":[],"class_list":["post-3287","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-biomedicina-pt-pt","category-biopsia-pt-pt"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>CTCs e bi\u00f3psia l\u00edquida em oncologia de precis\u00e3o<\/title>\n<meta name=\"description\" content=\"CTCs e bi\u00f3psia l\u00edquida em oncologia de precis\u00e3o: captura de c\u00e9lulas tumorais circulantes e aplica\u00e7\u00f5es na medicina personalizada.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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