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1.  Three new chondrosarcoma cell lines: one grade III conventional central chondrosarcoma and two dedifferentiated chondrosarcomas of bone 
BMC Cancer  2012;12:375.
Background
Chondrosarcoma is the second most common primary sarcoma of bone. High-grade conventional chondrosarcoma and dedifferentiated chondrosarcoma have a poor outcome. In pre-clinical research aiming at the identification of novel treatment targets, the need for representative cell lines and model systems is high, but availability is scarce.
Methods
We developed and characterized three cell lines, derived from conventional grade III chondrosarcoma (L835), and dedifferentiated chondrosarcoma (L2975 and L3252) of bone. Proliferation and migration were studied and we used COBRA-FISH and array-CGH for karyotyping and genotyping. Immunohistochemistry for p16 and p53 was performed as well as TP53 and IDH mutation analysis. Cells were injected into nude mice to establish their tumorigenic potential.
Results
We show that the three cell lines have distinct migrative properties, L2975 had the highest migration rate and showed tumorigenic potential in mice. All cell lines showed chromosomal rearrangements with complex karyotypes and genotypic aberrations were conserved throughout late passaging of the cell lines. All cell lines showed loss of CDKN2A, while TP53 was wild type for exons 5–8. L835 has an IDH1 R132C mutation, L2975 an IDH2 R172W mutation and L3252 is IDH wild type.
Conclusions
Based on the stable culturing properties of these cell lines and their genotypic profile resembling the original tumors, these cell lines should provide useful functional models to further characterize chondrosarcoma and to evaluate new treatment strategies.
doi:10.1186/1471-2407-12-375
PMCID: PMC3484068  PMID: 22928481
Bone neoplasm; Chondrosarcoma; Cell line; IDH1; IDH2; p16
2.  Soft tissue extension increases the risk of local recurrence after curettage with adjuvants for giant-cell tumor of the long bones 
Acta Orthopaedica  2012;83(4):401-405.
Background and purpose
Risk factors for local recurrence of giant-cell tumor of bone (GCTB) have mostly been studied in heterogeneous treatment groups, including resection and intralesional treatment. The aim of the study was the identification of individual risk factors after curettage with adjuvants in GCTB.
Methods
Of 147 patients treated for primary GCTB between 1981 and 2009, 93 patients were included in this retrospective single-center study. All patients were treated with curettage and polymethylmethacrylate (PMMA) with (n = 75) or without (n = 18) phenol. Mean follow-up was 8 (2–24) years. Recurrence-free survival was assessed for treatment modalities. Age, sex, tumor location, soft tissue extension, and pathological fractures were scored for every patient and included in a Cox regression analysis.
Results
The recurrence rate after the first procedure was 25/93. Recurrence-free survival for PMMA and phenol and for PMMA alone was similar. Eventually, local control was achieved using 1 or multiple intralesional procedures in 85 patients. Resection was required in 8 patients. A higher risk of local recurrence was found for soft tissue extension (HR = 5, 95% CI: 2–12), but not for age below 30, sex, location (distal radius vs. other), or pathological fracture.
Interpretation
Curettage with adjuvants is a feasible first-choice treatment option for GCTB, with good oncological outcome and joint preservation. Soft tissue extension strongly increased the risk of local recurrence, whereas age, sex, location, and pathological fractures did not.
doi:10.3109/17453674.2012.711193
PMCID: PMC3427632  PMID: 22880716

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