Sandra D Castillo, Xabier Perosanz, Andrew K Ressler, Marta Ivars, Jairo Rodríguez, Carlota Rovira, Emanuele M Nola, Judith Llena, Joaquim Grego-Bessa, Mónica Roldán, Raquel Arnau, Anabel Martínez-Romero, Ignasi Barber, Miguel Bejarano, Asunción Vicente, Verónica Celis, Héctor Salvador, Jaume Mora, Douglas A Marchuk, Eulalia Baselga, Mariona Graupera
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引用次数: 0
Abstract
PTEN hamartoma tumor syndrome (PHTS) is a rare tumor risk disorder caused by germline loss-of-function mutations in PTEN. Half of these patients develop vascular malformations, a hamartoma characterized by overgrowth of vessels. In this study, we harness biopsies and patient-derived endothelial cells (EC) to study the genetic etiology of PHTS-related vascular malformations. We discover that these lesions are generated by somatic loss of the PTEN wild-type allele through copy-neutral loss of heterozygosity, leading to somatic uniparental disomy of the PTEN-mutated allele in ECs. We established a mouse model of PHTS-related vascular malformations and identified that the mTOR inhibitor rapamycin and AKT inhibitor capivasertib block vascular lesion growth. As proof-of-concept for clinical activity, off-label treatment with rapamycin of two patients with PHTS reduced vascular overgrowth and abrogated lesion-associated pain. Overall, our results uncover the genetic cause of vascular malformations in patients with PHTS and open new avenues for therapeutic intervention.
Significance: Somatic loss of PTEN in ECs causes vascular malformations in patients with the tumor risk syndrome PHTS. These lesions respond to PI3K signaling inhibition. See related commentary by Del Prior and Toker, p. 1306.
期刊介绍:
Cancer Discovery publishes high-impact, peer-reviewed articles detailing significant advances in both research and clinical trials. Serving as a premier cancer information resource, the journal also features Review Articles, Perspectives, Commentaries, News stories, and Research Watch summaries to keep readers abreast of the latest findings in the field. Covering a wide range of topics, from laboratory research to clinical trials and epidemiologic studies, Cancer Discovery spans the entire spectrum of cancer research and medicine.