Conclusion:
We conclude that simple prognostic models predict the prognosis in individual homogenous cohorts of adolescent and young adult patients with non-metastatic and metastatic osteosarcoma and Ewing’s sarcomas. In addition to conventional prognosticators, failure to complete the treatment protocol (all cohorts) and the disease not being amenable to curative treatment (metastatic cohort) were associated with inferior outcomes. These simple prognostic models are effective and with wide applicability including in LMIC and merit appropriate recognition.