The CATSINDO Trial - Clinical and Translational Study in Newly Diagnosed Osteosarcoma

Summary

The goal of this study is to learn whether children, adolescents, and young adults with newly diagnosed high-grade osteosarcoma can be safely discharged from the hospital at slightly higher methotrexate blood levels after receiving standard high-dose methotrexate chemotherapy. Participants are 22 years old or younger and are receiving standard MAP (high-dose methotrexate with doxorubicin and cisplatin) chemotherapy as part of their routine cancer treatment. The main questions this study aims to answer are: * Is hospital discharge at higher methotrexate levels safe, based on side effects or hospital re-admission within 7 days? * Can patient-derived osteosarcoma tumor organoids be successfully generated across multiple centers? Researchers will compare safety outcomes and hospital length of stay to historical patient data discharged at lower methotrexate levels. Participants will receive standard chemotherapy, meet study-defined discharge criteria, be monitored for side effects, and have the option to provide tumor and blood samples for future research.

Description

Eligibility

Age range

7–22 years

Sex

All

Healthy volunteers

No

Interventions

• Drug
  High-dose Methotrexate

  High-dose methotrexate (HD-MTX) is administered intravenously at a dose of 12 g/m² (maximum dose 20 g) over 4 hours as part of standard-of-care MAP chemotherapy for participants with newly diagnosed high-grade osteosarcoma. HD-MTX is delivered with standard supportive care measures, including alkalinized intravenous hydration, serial serum methotrexate level monitoring, and leucovorin rescue beginning 24 hours after methotrexate initiation and continued until discharge criteria are met. Treatment is administered according to institutional standards throughout neoadjuvant/induction and adjuvant/consolidation therapy.

Locations (8)