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Updated: May 18, 2026
A Mouse Model of Incompletely Resected Soft Tissue Sarcoma for Testing (Neo)adjuvant Therapies
Published on: July 28, 2020
Surgical resection of relapse may improve postrelapse survival of patients with localized osteosarcoma
Kwok Chuen Wong1, Vincent Lee, Matthew M K Shing
1Department of Orthopaedics and Traumatology, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin NT, Hong Kong SAR, China.
Background:
Despite neoadjuvant chemotherapy and wide surgical ablation, 15% to 25% of patients with primary osteosarcoma will relapse (local recurrence or metastases). Neither chemotherapy nor radiation therapy alone will render a patient disease-free without concomitant surgical ablation of relapse. We prefer excision of relapse when possible. However, it is unclear whether excision enhances survival.
Questions/Purposes:
We therefore determined (1) onset, location, and treatments for relapse; (2) postrelapse disease-free survival of patients who underwent surgical ablation and those who did not; and (3) relapse-free interval between initial diagnosis and first relapse in survivors and in those who died of their disease.
Methods:
We retrospectively reviewed 15 children who initially presented with localized, nonmetastatic extremity osteosarcoma and attained initial complete remission after neoadjuvant chemotherapy, wide local resection, postoperative chemotherapy, and subsequently developed disease relapse. Relapse occurred at a median of 28 months, although late relapse after 5 years occurred in three. We resected the recurrent tumor in nine patients and treated six nonoperatively.
Results:
Seven of nine surgically treated patients had a postrelapse disease-free survival ranging from 3 to 14 years and an overall survival ranging from 7 to 16 years. Patients not surgically treated all died within 40 months of their relapse. The median relapse-free interval in patients who survived was longer 34 months (range, 17-152 months) as compared with 17 months (range, 7-40 months) in those who died of their disease.
Conclusions:
Our data confirm the importance of surgery in patients with relapsed osteosarcoma. Disease-free survival in patients with relapsed osteosarcoma is only possible if complete remission is attained. Patients with late relapse may have a better chance of survival.
Level Of Evidence:
Level IV, therapeutic study. See Guidelines for Authors for a complete description of levels of evidence.
