Extended molecular profiling in mesenchymal tumors: a consensus paper from the Italian Sarcoma Group

: Extended molecular profiling using massive parallel sequencing (MPS) technologies, commonly referred to as next-generation sequencing (NGS), has revolutionized cancer diagnosis and treatment, including in bone and soft tissue sarcomas (BSTS). This heterogeneous group of mesenchymal tumors presents a complex spectrum of genetic alterations, such as chromosomal rearrangements, point mutations, and copy number variations. Unlike carcinomas, where driver mutations are often well defined, the role of specific genomic signatures in dictating BSTS prognosis and therapy response remains to be fully elucidated. Despite its promise, the adoption of MPS/NGS in BSTS is limited by variability in testing access, turnaround times, specimen quality, costs, and data interpretation. Although identified alterations are often not yet directly targetable, they provide critical insights that can refine diagnosis, enable better patient stratification, and guide treatment strategies. To optimize the use of MPS/NGS in BSTS, harmonization and multidisciplinary collaboration within molecular tumor boards (MTBs) are essential. With this aim, the Italian Sarcoma Group ETS (ISG) convened a consensus meeting to establish best practices for integrating MPS/NGS into everyday clinical care. ISG experts developed ten consensus statements: the first five address the role of extended molecular profiling in BSTS diagnostics, while the others offer guidance on MPS/NGS use and interpretation when searching for potentially actionable targets in the treatment of advanced disease. Furthermore, collaboration with the National Rare Cancer Network to offer expert consultation and systematically correlate MPS/NGS findings with clinical outcomes for BSTS cases undergoing extended molecular profiling will be critical to advancing precision medicine in this field.