Supplementary Material for: Prediction of Time to Castration-Resistant Prostate Cancer Using Bone Scan Index in Men with Metastatic Hormone-Sensitive Prostate Cancer

<b><i>Introduction:</i></b> We evaluated bone scan index (BSI) as a predictive biomarker for time to castration-resistant prostate cancer (CRPC) in patients with metastatic hormone-sensitive prostate cancer (mHSPC). <b><i>Materials and Methods:</i></b> We identified 85 consecutive mHSPC patients treated with first-line androgen deprivation therapy. We analyzed the correlations between time to CRPC and clinicopathological characteristics, including age, prostate-specific antigen (PSA) level, Gleason score, clinical TNM stage, hemoglobin, lactate dehydrogenase, C-reactive protein, and BSI. <b><i>Results:</i></b> The median BSI was 2.7%. Progression to CRPC occurred in 55 (64.7%) patients and the median time to CRPC was 12.9 months. In multivariate analysis, 3 significant risk factors for time to CRPC were identified: age (&gt;73 vs. ≤73 years; hazard ratio [HR] 0.53), <i>p</i> = 0.038, PSA level (&gt;270 vs. ≤270 ng/mL; HR 0.53, <i>p</i> = 0.038), and BSI (&gt;2.7 vs. ≤2.7%; HR 2.97, <i>p</i> &lt; 0.001). <b><i>Conclusion:</i></b> Age, PSA level, and BSI were found to be significant predictive factors for time to CRPC in patients with mHSPC.