ALIGNED Network for rare cerebrovascular diseases: methodology and preliminary results

Cerebrovascular diseases are a major cause of morbidity/mortality worldwide, yet more than 30% of strokes remain of undetermined origin. Rare cerebrovascular diseases (rCVDs) contribute to this burden but are often underdiagnosed due to limited awareness, clinical heterogeneity, and fragmented diagnostic access. The ALIGNED project was established to address these gaps through a nationwide multidisciplinary network.

ALIGNED was aimed to improve clinical/molecular characterization of rCVDs through standardized data collection, assess level of care of rCVDs by an online/on-site survey and reduce the geographical gap across Italy, by a virtual model of rCVDs care. In the first phase we conducted a survey to evaluate the availability of diagnostic/therapeutic pathways. Preliminary molecular profiling (i.e., transcriptomic/proteomic analyses) has been carried out on middle-cerebral artery and plasma samples from Moyamoya angiopathy (MMA) patients.

Fourty-nine centers adhered to the project. Initially, we collected a cohort of 308 subjects with rCVDs: CADASIL (162), COL4A1/A2-related disease (9), Sneddon syndrome (25), Fabry disease (32), and MMA (80). Web-based survey and site visits provided a representative overview of national capabilities in rCVD diagnosis and care. Transcriptomic analysis showed a peculiar expression profile of angiogenesis growth factors/inhibitors in MMA cerebral vessels. Plasma proteomic profiles of MMA patients highlighted circulating proteins expressed in dysfunctional angiogenesis.

Preliminary data suggested a substantial variability in the quality of rCVDs management and in the availability of diagnostic tools across Italy. Thus, mapping Italian expertise and facilities emerged as a crucial target for pinpointing gaps, improving resource allocation, standardizing rCVD care to guarantee equitable access for patients.