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Published on: September 9, 2020
A New Relevant Integrated Radiologic and Surgical Classification Scheme for Giant Cell Tumors of Bones
Yu-Cherng Chang1, Juan Pretell-Mazzini, H Thomas Temple
1From the Department of Radiology, Jackson Memorial Hospital, Miami, FL (Dr. Chang); the Baptist Heath South Florida, Plantation, FL (Dr. Pretell-Mazzini); the Department of Orthopaedics, Leonard M. Miller School of Medicine, University of Miami, Miami, FL (Dr. Temple); the Nova Southeastern School of Allopathic Medicine, Davis, FL (Dr. Soler); the Leonard M. Miller School of Medicine, University of Miami (Mr. Purrinos); the Department of Pathology and Laboratory Medicine, Leonard M. Miller School of Medicine, University of Miami (Dr. Rosenberg); Department of Medicine, Division of Hematology and Oncology, Leonard M. Miller School of Medicine, University of Miami (Dr. Jonczak); and the Musculoskeletal Radiology Division, Department of Radiology, Leonard M. Miller School of Medicine, University of Miami, Miami, FL (Dr. Subhawong).
A new giant cell tumor (GCT) grading system, based on surgical features, shows better prediction of recurrence than the Campanacci system. This novel classification improves management decisions for GCTs.
Area of Science:
- Orthopedic Oncology
- Radiology
- Tumor Classification
Background:
- Conventional giant cell tumor (GCT) classification systems lack correlation with clinical outcomes.
- A new radiologic classification system for GCTs is proposed, focusing on surgically relevant features.
Purpose of the Study:
- To develop and validate a novel radiologic classification system for giant cell tumors (GCTs).
- To compare the predictive performance of the new system against the conventional Campanacci grading system.
Main Methods:
- Retrospective study of 35 extremity GCTs with preoperative imaging.
- Independent assessment of tumors by a musculoskeletal radiologist and orthopaedic oncologist using Campanacci and the novel grading system.
- Interrater agreement assessed using intraclass correlation coefficient; grading similarity compared using the two-way Friedman test.
Main Results:
- The novel GCT grading system demonstrated excellent interrater agreement (0.79).
- Campanacci grades were significantly higher than novel grades, suggesting overestimation by the conventional system.
- The novel system classified more nonrecurrent curetted tumors as low grade (17% vs. 29% for Campanacci grade 1).
Conclusions:
- The novel GCT grading system exhibits strong interrater reliability.
- The new system shows improved predictive performance for recurrence compared to the Campanacci classification.
- This classification may enhance management decisions for giant cell tumors.
