NCT06114225

Pulmonary Resectable Osteosarcoma Treated by Metastasectomy and Pre-operative Immunotherapy and Stereotactic Body Radiotherapy (PROMIS): a Prospective Clinical Trial

A Prospective Phase II Clinical Trial on Pre-operative Immunotherapy and Stereotactic Body Radiotherapy Followed by Metastasectomy in Patients With Pulmonary Resectable Recurrence of Osteosarcoma

• Status: Recruiting
• Phase: Phase 2
• Study type: Interventional
• Enrollment: 43 (estimated)
• Sponsor: Ruijin Hospital · Academic / Other
• Sex: All
• Age: 10 Years – 65 Years
• Healthy volunteers: Not accepted

Summary

The aim of this study is to evaluate the efficacy and safety of pre-operative concurrent Stereotactic Body Radiotherapy (SBRT) and and programmed cell death protein-1 (PD-1) blockade immunotherapy followed by surgical metastasectomy for resectable metastatic osteosarcoma.

Detailed description

Osteosarcoma is a primary bone malignant tumor with strong metastatic potential. About 15%-20% of osteosarcomas are accompanied by lung metastasis when diagnosed, and about 40% of patients develop secondary lung metastasis after radical surgery of the primary lesion. However, pulmonary metastatic osteosarcoma are often insensitive to traditional radiotherapy and chemotherapy. For resectable lung metastases, the preferred treatment is still complete resection of all metastases and the best therapeutic modality and regimens pre- and post-surgical remains unestablished. With the advent of immunotherapy, many common solid tumors have made substantial progress through immunotherapy after distant metastasis. However, a number of current clinical studies on immunotherapy for osteosarcoma have shown that the effective rate of immunotherapy for osteosarcoma is about 5% to 10% after single agent treatment, making it regarded as one of the "immune cold" tumor, potentially due to the fact that osteosarcoma often lacks immune cell infiltration, and immune cells in tumors are often difficult to be activated or preserve immune memory. However, the investigators have found in our previous clinical observations that a small number of osteosarcoma patients not only have significant effects on immunotherapy, but even have long-term responses. The investigators unexpectedly found that the degree of tumor pro-inflammatory factors and lymphocyte infiltration in the osteosarcoma sample significantly increased after radiotherapy, especially SBRT. The investigators also discovered that the induction of the formation of "tertiary lymphatic structure" within the tumor might be possible through SBRT as a potential sensitization strategy for immunotherapy in osteosarcoma, which is consistent with the recent knowledge of rado-immunotherapy of several solid tumors. Therefore, the investigators aim to conduct a prospective phase II clinical trial on pre-operative immunotherapy and stereotactic body radiotherapy (SBRT), followed by metastasectomy in patients with pulmonary resectable recurrence of osteosarcoma. To explore the potential mechanisms related to the pre-operative sensitization of immunotherapy, correlative biomarker analysis is to be performed to explore the tumor microenvironment pre- and post- SBRT to pave the way for further precision immunotherapy of bone sarcoma in the future.

Conditions

• Osteosarcoma

Interventions

Type	Name	Description
COMBINATION_PRODUCT	metastasectomy and pre-operative immunotherapy (gemcitabine and penpulimab ) and stereotactic body radiotherapy	participants first receive concurrent SBRT and penpulimab (PD-1 blockade) and two cycles of GP regimen (gemcitabine d1,d8 and Penpulimab d8 per a 21-day cycle), followed by complete pulmonary metastasectomy. After surgery, participant receive another 4 cycles of GP regimens followed by Penpulimab monotherapy maintenance. The rationale is that pre-operative SBRT could boost the immune microenvironment, leading to a long-term effect of immunotherapy post-metastasectomy and eventually resulting in better long-term survivorship compared to the histological control for pulmonary resectable recurrence of osteosarcoma .

Timeline

• Start date: 2023-06-01
• Primary completion: 2026-09-15
• Completion: 2026-12-30
• First posted: 2023-11-02
• Last updated: 2023-11-02

Locations

1 site across 1 country: China