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BMC Cancer

, 10:381

First Online: 21 July 2010Received: 18 September 2009Accepted: 21 July 2010DOI: 10.1186-1471-2407-10-381

Cite this article as: Koizumi, M., Yoshimoto, M., Kasumi, F. et al. BMC Cancer 2010 10: 381. doi:10.1186-1471-2407-10-381


BackgroundTo help design clinical trials of adjuvant bisphosphonate therapy for breast cancer, the temporal incidence of bone metastasis was investigated in a cohort of patients. We have tried to draw the criteria to use adjuvant bisphosphonate.

MethodsConsecutive breast cancer patients undergoing surgery between 1988 and 1998 5459 patients were followed up regarding bone metastasis until December 2006. Patients- characteristics at the time of surgery were analyzed by Cox-s method, with bone metastasis as events. Patient groups were assigned according to Cox-s analysis, and were judged either to require the adjuvant bisphosphonate or not, using the tentative criteria: high risk >3% person-year, medium risk 1-3%, and low risk <1%.

ResultsBone metastasis incidence was constant between 1.0 and 2.8% per person-year more than 10 years. Non-invasive cancer was associated with a very low incidence of bone metastasis 1-436. Multivariate Cox-s analysis indicated important factors for bone metastasis were tumor grade T, nodal grade pN, and histology. Because T and pN were important factors for bone metastasis prediction, subgroups were made by pTNM stage. Patients at stages IIIA, IIIB and IV had an incidence of >3% per person-year, patients with stage I <1% per person-year, and those with stages II were between 1 and 3%. Further analysis with histology in stage II patients showed that stage IIB with high risk histology also had a high incidence 3% person year, whereas stage IIA with medium risk histology were <1%.

ConclusionsBone metastasis incidence remained constant for many years. Using pN, T, and histopathology, patients could be classified into high, medium, and low risk groups.

Electronic supplementary materialThe online version of this article doi:10.1186-1471-2407-10-381 contains supplementary material, which is available to authorized users.

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Autor: Mitsuru Koizumi - Masataka Yoshimoto - Fujio Kasumi - Takuji Iwase


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