Growth Pathway Activation Found in Lymphatic Malformations Independent of Genetic Status
University of Osaka researchers analyzed tissue samples from 34 patients with lymphatic malformations and found that the PI3K/AKT/mTOR growth signaling pathway was abnormally active in malformed vessels regardless of whether patients carried PIK3CA gene mutations. The team also identified additional genes including NFATC1 that were highly expressed in affected vessels, suggesting the calcineurin-NFAT pathway may be another therapeutic target. These findings provide a more comprehensive understanding of the molecular mechanisms driving the disease.
Lymphatic malformations represent a group of rare developmental disorders affecting the lymph vessel system, potentially emerging during childhood with serious complications including fluid accumulation, secondary infections, and compromised breathing. The research examined biological samples from three dozen patients to map the molecular landscape of the condition. Notably, just over half the participants carried mutations in a specific gene previously implicated in abnormal vessel formation, yet this genetic marker did not substantially alter the clinical presentation across the patient population.
The investigation employed advanced molecular techniques to identify patterns of gene activity within diseased tissue. Beyond the well-known growth pathway, researchers discovered heightened expression of genes involved in cellular signaling mechanisms, pointing toward multiple biological systems that may drive disease progression and suggesting that effective treatment may require targeting several molecular pathways simultaneously.
These findings could potentially reshape clinical management of lymphatic malformations by indicating that existing therapies targeting the PI3K/AKT/mTOR pathway may benefit a broader patient population than genetic screening alone would predict. If additional pathways like calcineurin-NFAT prove therapeutically relevant, combination treatment approaches might emerge. The work may particularly impact children with this condition by expanding options for managing complications like swelling and infection. However, translation from tissue analysis to clinical application typically requires years of further study and clinical trials.