Establishment and characterization of NCC-GCTB14-C1 and NCC-GCTB15-C1: two novel patient-derived cell lines of giant cell tumor of bone.

Giant cell tumor of bone (GCTB) is a rare bone tumor that is genetically characterized by a unique mutation in the H3-3A gene. Curative surgical resection is the standard treatment. Unfortunately, a considerable proportion of patients with GCTB have local recurrence and pulmonary metastasis after surgical treatment, and current chemotherapy treatments have shown non-effective. Considering the heterogeneity of the disease, patient-derived cancer models established from multiple cases are required. Therefore, we aimed to establish novel GCTB cell lines for use in preclinical studies. In this study, we successfully established two GCTB cell lines, NCC-GCTB14-C1 and NCC-GCTB15-C1. Both cell lines retained the genetic characteristics of the original tumors, constantly proliferated, and exhibited migratory activity. These cells formed spheroids with morphologically variable phenotypes. We found that they were compatible with chemosensitivity assays, and drug screening using these cell lines led to the identification of potential therapeutic candidates for GCTB. Therefore, NCC-GCTB14-C1 and NCC-GCTB15-C1 may be useful for elucidating the pathogenesis of and developing novel treatments for GCTB.