Osteosarcoma Profile in Dr. Soetomo General Academic Hospital Surabaya: A 5-year Retrospective Khafidhotul Ilmiah1,2*, Heriyawati1,2 Abstract Background: Osteosarcoma is the most common primary malignant bone tumor in adolescents and young adults. Pathological assessment plays a pivotal role in confirming the diagnosis and evaluating treatment response. However, comprehensive data describing the