Multimodality Treatment of Skull Base Chondrosarcomas: The Role of Histology Specific Treatment Protocols. Issue 3 (September 2017)

• Record Type: Journal Article
• Authors: Raza, Shaan M.; Gidley, Paul W.; Meis, Jeanne M.; Grosshans, David R.; Bell, Diana; DeMonte, Franco
• Is Part Of: Neurosurgery. Volume 81:Issue 3(2017)
• Publication Date: 2017-09
• Subjects: Chondrosarcoma -- Skull Base -- Surgery -- Radiation Therapy -- Chemotherapy -- Malignancy -- Oncology -- Sarcoma; Nervous system -- Surgery -- Periodicals; 617.48005
• DOI: 10.1093/neuros/nyx042
• Languages: English
• ISSNs: 0148-396X

Abstract

Abstract : BACKGROUND: : Limited data exist to guide the multimodality management of chondrosarcomas (CSAs) arising in the skull base. OBJECTIVE: : To determine the impact of histological subtype/grade on progression‐free survival (PFS) and the indications for surgery, radiation, and chemotherapy based on histology. METHODS: : A retrospective review was performed of 37 patients (conventional type: 81%, mesenchymal: 16.2%, dedifferentiated: 2.7%) treated at The University of Texas M.D. Anderson Cancer Center. Of the conventional subtype, 23% were grade 1, 63% were grade 2, and 14% were grade 3. In addition to surgery, mesenchymal/dedifferentiated CSAs (18% of the cohort) underwent neoadjuvant chemotherapy and 48.6% of the overall cohort received adjuvant radiotherapy. Histological grade/subtype and treatment factors were assessed for impact on median PFS (primary outcome). RESULTS: : Conventional subtype vs mesenchymal/dedifferentiated was positively associated with median PFS (166 vs 24 months, P < .05). Increasing conventional grade inversely correlated with median PFS ( P < .05). Gross total resection positively impacted PFS in conventional CSAs (111.8 vs 42.9 months, P = .201) and mesenchymal/dedifferentiated CSAs (58.2 vs 1.0 month, P < .05). Adjuvant radiotherapy significantly impacted PFS in conventional grades 2 and 3 (182 vs 79 months, P < .05) and a positive trend with mesenchymal/dedifferentiated CSAs (43.5 vs 22.0 months). Chemotherapy improved PFS for mesenchymal/dedifferentiated CSAs (50 vs 9 months, P = .089). CONCLUSION: : There is a potential need for histological subtype/grade specific treatment protocols. For conventional CSAs, surgery alone provides optimal results grade 1 CSAs, while resection with adjuvant radiotherapy yields the best outcome for grade 2 and 3 CSAs. Improvements in PFS seen with neoadjuvant therapy in mesenchymal/dedifferentiated CSAs indicate a potential role for systemic therapies. Larger studies are necessary to confirm the proposed treatment protocols.