MoleculAr Profiling for Pediatric and Young Adult Cancer Treatment Stratification 2

FMG2025 continues the previous efforts to propose treatment for patients based on the molecular characteristics of their tumor at treatment failure in cancer precision medicine trials within standard of care in France. However, whereas FMG2025 is a descriptive effort providing the basis for clinical decisions, MAPPYACTS 2 will translate these findings to clinical actions. The symbiosis is critical to advance patient care. Since 2012, the molecular profiling trials "MOlecular Screening for CAncer Treatment Optimization" (MOSCATO-01) and "MoleculAr Profiling for Pediatric and Young Adult Cancer Treatment Stratification" (MAPPYACTS) have included pediatric and adolescent patients with recurrent or refractory malignancy that underwent on-purpose biopsy or surgical intervention. Whole Exome Sequencing of tumor and normal tissue and RNA Sequencing of tumor tissue have been applied to detect genomic alterations that could lead to an adapted targeted treatment. Furthermore, ancillary studies were associated exploring circulating tumor DNA, the immune contexture of tumors and developing Patient-Derived Xenografts (PDX). The FMG2025 project transfers the molecular profiling of advanced pediatric cancers into a global approach that is now considered standard of care in France. Subsequent clinical recommendations and decisions will be made based on discussions with biologists, scientist and physicians in the molecular and clinical molecular tumor boards. Associated ancillary research studies and links to clinical interventional studies remain essential elements of the program to provide clinical, translational and basic research in order to improve scientific knowledge. The program is articulated in two main parts that are closely interacting: FMG2025 - Cancers et leucémies pédiatriques en échec de traitement or equivalent international projects that cover the sequencing of tumor and blood samples and provide molecular reports. The clinical study MAPPYACTS 2 that provides