Neoadjuvant Radiation in High-Grade Soft-Tissue Sarcomas: Histopathologic Features and Response Evaluation

Area of Science:

• Oncology
• Surgical Pathology
• Radiotherapy

Background:

• High-grade soft-tissue sarcomas require effective prognostic indicators post-preoperative radiomonotherapy.
• Assessing treatment response through histologic parameters is crucial for patient outcomes.

Purpose of the Study:

• To evaluate the prognostic value of the European Organization for Research and Treatment of Cancer-Soft Tissue and Bone Sarcoma Group (EORTC-STBSG) score and specific histologic features.
• To determine the association of these factors with overall survival (OS) and disease-free survival (DFS) in localized, nonmetastatic high-grade soft-tissue sarcomas.

Main Methods:

• Standardized macroscopic workup and whole-section evaluation of 64 pretreated soft-tissue sarcoma specimens.
• Assessment of viable tumor, coagulative necrosis, hyalinization/fibrosis, and infarction.
• Correlation of histologic findings and EORTC-STBSG score with OS and DFS.

Main Results:

• Limb salvage was achieved in 98.4% of patients with negative resection margins in 90.6%.
• Hyalinization/fibrosis was a significant independent prognostic factor for overall survival (HR=4.4; P=0.047).
• The EORTC-STBSG score and other histologic parameters (viable tumor, necrosis, infarction) did not show prognostic significance.

Conclusions:

• Histologic hyalinization/fibrosis is a valuable independent prognostic marker for overall survival in high-grade soft-tissue sarcomas treated with neoadjuvant radiomonotherapy.
• The EORTC-STBSG response score may not accurately reflect long-term outcomes in this patient cohort.