Christoffel Tampubolon , G. , Siregar, O. and Andriandi 2023. Association between Serum Alp Levels and Pre- Operative LDH towards Clinical Prognosis of Osteosarcoma Patients in H. Adam Malik Hospital, Medan. Sumatera Medical Journal. 6, 1 (Mar. 2023), 11–19. DOI:https://doi.org/10.32734/sumej.v6i1.8991.