Current information on the incidence and prevalence of bone metastases in women with breast cancer is scarce. This study examined the occurrence and predictors of bone metastases, as well as post-metastasis survival in a prospective cohort of Canadian women with breast cancer. We included women treated for early-stage (stage I, II, or III) breast cancer at the Henrietta Banting Breast Centre (HBBC) in Toronto, Canada between 1987 and 2000. Data were abstracted from medical records and pathology reports in the HBBC database; follow-up extended to end of data availability or August 31, 2015. Actuarial survival analyses provided cumulative incidence of bone metastases at 5, 10, and 15 years after breast cancer diagnosis. Kaplan-Meier curves describe breast cancer mortality. Regression models assessed patient, tumor, and treatment characteristics as predictors of bone metastases with all-cause mortality as a competing risk. Among 2097 women studied, the 5-, 10-, and 15-year probability of bone metastasis was 6.5, 10.3, and 11.3 % for the first recurrence, and 8.4, 12.5, and 13.6 % for any bone recurrence. At median follow-up (12.5 years), 13.2 % of patients had bone metastases. Median survival was 1.6 years following bone metastasis, and shorter if both bone and visceral metastases occurred. Advanced age and adjuvant treatment with tamoxifen were protective against bone metastasis. In this representative cohort of women diagnosed with early-stage breast cancer in Ontario, Canada, with long follow-up, the incidence of bone metastases was consistent with longitudinal studies from the United Kingdom, Denmark, and the US.
The MBCN take the 18-year relative survival rate from the SEERS data between the years of 1990 to 1994 as 71%. The argument is, that this takes us close to the 30% recurrence rate statistic. However, there are many other factors at play and treatment has advanced so much that recurrence rates may have even halvedsince then.”
The advice I have been given from a breast surgeon is-
Early breast cancer carries a lifetime risk of metastasis of 10-20%, with early breast cancer defined as any breast cancer up to 5cm large.Risk of metastatic disease for cancer less than 2 cm at time of diagnosis is much less.
Like you I will get on with living and enjoying my life but with this thought hovering in the background should anything inexplicable happen to my health whereupon I’ll seek medical advice.