A prediction model of survival for patients with bone metastasis from uterine corpus cancer

<span class="paragraphSection"><div class="boxTitle">Abstract</div><div class="boxTitle">Objective</div>The aim of the study was to establish a predictive model of survival period after bone metastasis from endometrial cancer.<div class="boxTitle">Methods</div>A total of 28 patients with bone metastasis from uterine corpus cancer were included in the study. Data at the time of bone metastasis diagnosis, which included presence of extraskeletal metastasis, performance status, history of any previous radiation/chemotherapy and the number of bone metastases, were collected. Survival data were analyzed using Kaplan–Meier methods and Cox proportional hazard models.<div class="boxTitle">Results</div>The most common site of bone metastasis was the pelvis (50.0%), followed by lumbar spine (32.1%), thoracic spine (25.0%) and rib bone (17.9%). The median survival period after bone metastasis was 25 weeks. The overall rate of survival after bone metastasis of the entire cohort was 75.0% at 13 weeks, 46.4% at 26 weeks and 42.9% at 52 weeks. Performance status of 3–4 was confirmed as an independent prognostic factor (Hazard ratio, 3.5; 95% confidence interval, 1.41–8.70) and multiple bone metastases tended to be associated with poor prognosis (Hazard ratio, 2.4; 95% confidence interval, 0.95–5.97). A prognostic score was calculated by adding up the number of these two factors. The 26-week survival rates after bone metastasis were 88.9% for those with a score of 0, 45.5% for those with a score of 1 and 0% for those with a score of 2 (<span style="font-style:italic;">P </span>= 0.0006).<div class="boxTitle">Conclusions</div>This scoring system can be used to determine the optimal treatment for patients with bone metastasis from endometrial cancer.</span>

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