Volume 39, Issue 6 pp. 573-580
Research Article

Platinum agents in the treatment of osteosarcoma: Efficacy of cisplatin vs. carboplatin in human osteosarcoma cell lines

H. Robson BSc, PhD

Corresponding Author

H. Robson BSc, PhD

Tumour Biochemistry Laboratory, Clinical Research Department, Christie Hospital NHS Trust, Wilmslow Road, Manchester, United Kingdom

Tumour Biochemistry Laboratory, Clinical Research Department, Christie Hospital NHS Trust, Wilmslow Road, Manchester M20 4BX, United Kingdom.Search for more papers by this author
S. Meyer MD, MRCP

S. Meyer MD, MRCP

Department of Paediatric Oncology, Clinical Research Department, Christie Hospital NHS Trust, Wilmslow Road, Manchester, United Kingdom

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S.M. Shalet MD, FRCP

S.M. Shalet MD, FRCP

Department of Endocrinology, Clinical Research Department, Christie Hospital NHS Trust, Wilmslow Road, Manchester, United Kingdom

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E. Anderson BSc, PhD

E. Anderson BSc, PhD

Tumour Biochemistry Laboratory, Clinical Research Department, Christie Hospital NHS Trust, Wilmslow Road, Manchester, United Kingdom

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S. Roberts

S. Roberts

Tumour Biochemistry Laboratory, Clinical Research Department, Christie Hospital NHS Trust, Wilmslow Road, Manchester, United Kingdom

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O.B. Eden FRCP, FRCPath

O.B. Eden FRCP, FRCPath

Department of Paediatric Oncology, Clinical Research Department, Christie Hospital NHS Trust, Wilmslow Road, Manchester, United Kingdom

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First published: 09 October 2002
Citations: 34

Abstract

Background

Cisplatin (cDDP), when used either alone or, more often, in combination with other agents, especially adriamycin, achieves a high response rate in osteosarcoma. Its use, however, is limited by severe nephro- and neuro-toxicity. Second generation platinum compounds, most notably carboplatin (CBDCA), have been developed in order to attempt to reduce these dose-limiting toxicities, and thus improve the therapeutic ratio. Studies evaluating the role of combination CT containing CBDCA vs. cDDP have demonstrated differing results depending on the tumor type tested and its role in the treatment of osteosarcoma has yet to be clarified.

Procedure

In this study, we compared the in vitro anti-tumor activity of cDDP and CBDCA in a panel of three human osteosarcoma cell lines (HOS, MG63, and U2OS).

Results

cDDP and CBDCA (0–20 μmol) showed marked variation in cytotoxicity among the three cell lines. EC50 values for CBDCA in HOS and MG63 cells were approximately two-fold higher than for cDDP and the ratio of AUCCBDCA to AUCcDDP varied from 1.8 in the HOS cell line to 2.3 in the MG63 cell line. Exposure of MG63 and HOS cells to either cDDP or CBDCA (1.67 and 13.5 μmol) caused a G2/M cell cycle arrest by 24 hr. Also evident was a sub G1 peak indicative of cell death by apoptosis. U2OS cells were relatively resistant to the cytotoxic effects of both drugs, although a cell cycle arrest in response to DNA damage was observed. This suggests that unlike MG63 and HOS cells, U2OS cells have either a more efficient repair pathway for platinum-induced DNA damage or are able to evade apoptosis. Examination of apoptotic events and cellular recovery demonstrated that both an 8–16-fold higher concentration and longer treatment period for CBDCA compared with cDDP was required to produce equivalent cell death and a loss of the ability of single cell clones to form colonies in both the HOS and MG63, but not the U2OS cell line.

Conclusions

Our findings suggest that CBDCA at a two- to four-fold higher concentration than cDDP has potential therapeutic activity in platinum sensitive osteosarcomas, particularly when cDDP cytotoxicity compromises therapeutic efficacy. Med Pediatr Oncol 2002;39:573–580. © 2002 Wiley-Liss, Inc.

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