P-31 changes as a measure of therapy response in resistant and sensitive osteosarcomas implanted into nude mice.
OBJECTIVE
To determine if changes in PCr/Pi and PME can be used to predict lack of tumor response to chemotherapy in a murine model of a chemotherapy-resistant human osteosarcoma.


METHODS
Cisplatin-resistant sublines were grown from high-grade cisplatin-sensitive human osteosarcoma. Surface coil localized 31P NMR spectroscopy of implanted cisplatin-resistant and sensitive osteosarcoma tumors in nude mice was performed.


RESULTS
A cisplatin-resistant subline of a sensitive human osteosarcoma was developed that was five times more resistant to cisplatin than the parent cell line. Our NMR data shows a statistically significant difference in the change in the PCr/Pi ratio after treatment between sensitive and resistant osteosarcomas at the alpha = 0.05 level. Changes in PME were seen in the sensitive tumors but were not statistically significant.


CONCLUSIONS
Changes in PCr/Pi predict lack of tumor treatment response in human osteosarcoma implanted into nude mice with a specificity of 70% and a sensitivity of 54%. Monitoring of PCr/Pi in human osteosarcoma patients may allow detection of response to chemotherapy before conventional imaging techniques.
Dept. of Radiation Therapy, Ajou University School of Medicine, Kyungkido, Suwon, Korea.
J R
JR
Ballinger
H
H
Kang
C A
CA
Sweeney
J D
JD
Scott
B P
BP
Croker
K N
KN
Scott
D000818:Animals; D000970:Antineoplastic Agents / Q000627:therapeutic use; D002945:Cisplatin / Q000627:therapeutic use; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D051379:Mice; D008819:Mice, Nude; D009368:Neoplasm Transplantation; D012516:Osteosarcoma / Q000188:drug therapy* / Q000378:metabolism*; D010710:Phosphates / Q000378:metabolism*; D010725:Phosphocreatine / Q000378:metabolism*; D010758:Phosphorus; D012680:Sensitivity and Specificity; D014183:Transplantation, Heterologous; D014407:Tumor Cells, Cultured
D000970:Antineoplastic Agents; D010710:Phosphates; D010725:Phosphocreatine; D010758:Phosphorus; D002945:Cisplatin