Chondrosarcoma — Genes & Biomarkers Summary Gene / BiomarkerBad ScoreFree ActionsNon-free Actions GENESBIOMARKERS IDH1Mutation detectedSurveillanceIvosidenib IDH2Mutation detectedGenetic counselingEnasidenib COL2A1Aberrant expr.Regular imagingSurgical resection TP53Loss of functionRisk assessmentChemotherapy RB1Deletion/lossSurveillanceCDK4/6 inhibitors CDKN2AHomoz. deletionImaging follow-upRadiation therapy ATRXLoss of expr.Genetic counselingPARP inhibitors TERTAmplificationMonitoringTelomerase inhib. SMARCB1Loss of expr.Genetic testingEZH2 inhibitors Ki-67Index > 10%Exercise & follow-upChemotherapy p53OverexpressionMonitoringTargeted therapy S100Absent/weakRegular imagingCore biopsy MDM2AmplificationGenetic counselingMDM2 inhibitors CDK4AmplificationMonitoringCDK4/6 inhibitors VEGFHigh expressionDiet modificationBevacizumab Sox9Low expressionSurveillanceSurgical resection