Characteristics and Prognostic Factors of Bone Metastasis in Patients With Colorectal Cancer

BACKGROUND: Because bone metastasis from colorectal cancer is rare, there are little available data regarding such cases. OBJECTIVE: The study aim was to identify the prognostic factors and characteristics associated with survival in colorectal cancer patients with bone metastasis. DESIGN: This was a retrospective study from a prospectively collected database. SETTINGS: The study took place in a multidisciplinary, high-volume tertiary cancer center in Japan. PATIENTS: Examined were records from 104 consecutive patients treated between 2004 and 2015 for bone metastasis from colorectal cancer. MAIN OUTCOME MEASURES: The primary outcome measure was overall survival. RESULTS: The spine was the most common site of bone metastasis from colorectal cancer. Right colon cancer correlated significantly with long bone metastasis (p = 0.046), whereas left colon cancer correlated significantly with spinal bone metastasis (p = 0.034). Liver metastasis was also significantly correlated with spinal bone metastasis (p = 0.036). The median interval between the primary therapy for colorectal cancer and the metachronous diagnosis of bone metastasis was 20.0 months (quartile 1 to quartile 3, 9.0–46.5 mo). The median survival time from diagnosis of bone metastasis from colorectal cancer was 5.0 months (95% CI, 4.0–9.0 mo), and the 1-year survival rate was 30.0% (95% CI, 21.1%–39.4%). Multivariate analysis revealed that ≥2 extra-bone metastatic organs, hypercalcemia, and pathologic fractures were independent poor prognostic factors (p

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