H3F3B gene mutation in chondroblastomas: a multicenter study
Acta Orthopaedica et Traumatologica Turcica, cilt.60, sa.4, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 60 Sayı: 4
- Basım Tarihi: 2026
- Doi Numarası: 10.5152/j.aott.2026.25277
- Dergi Adı: Acta Orthopaedica et Traumatologica Turcica
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Directory of Open Access Journals, Biomedical Reference Collection: Corporate Edition (EBSCO)
- Anahtar Kelimeler: Bone tumor, Chondroblastoma, H3F3A, H3F3B, Mutation
- Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
- İstanbul Medipol Üniversitesi Adresli: Evet
Özet
Objective: Chondroblastoma (CB) is a benign but locally aggressive bone tumor that may present histopathologic diagnostic challenges, particularly in atypical locations and limited biopsy specimens. Recent studies have identified recurrent mutations in the H3F3B and, less frequently, H3F3A genes, suggesting their potential diagnostic value. This study aimed to evaluate the prevalence and diagnostic utility of H3F3A and H3F3B mutations in a multicenter cohort of CB patients. Methods: Forty-three patients with histopathologically confirmed CB were included in a retrospective analysis. All cases were re-evalu-ated by 2 pathologists, and mutation analysis of H3F3A and H3F3B genes was performed using polymerase chain reaction–based Sanger sequencing. Results: H3F3B mutations were detected in 41 cases (95.3%), all corresponding to the Lys36Met substitution. One case (2.3%) harbored an H3F3A Gly34Trp mutation, whereas 1 case (2.3%) showed no detectable mutation. No significant histopathological differences were observed between mutation-positive and mutation-negative cases. A notable case involved a 72-year-old patient with frontal bone involve-ment, highlighting the diagnostic difficulty in unusual locations and older age groups. Conclusion: The findings demonstrate that H3F3B mutation analysis is an extremely sensitive and reliable molecular tool for confirming the diagnosis of CB. It is particularly valuable in challenging cases and especially in small biopsy samples where pathognomonic find-ings, such as chicken-wire calcification and chondroid matrix are not visible. Incorporation of molecular testing into targeted diagnostic workflows may improve diagnostic accuracy and assist in distinguishing CB from its histological mimics. Level of Evidence: Level IV, Diagnostic study.