Survival according to NTX level at 3 months (A) and extraskeletal involvement (B). Adjusted HR, controlling for age at diagnosis, shown.
Abbreviations: BM, bone metastasis; CI, confidence interval; Elev., elevated; HR, hazard ratio; IQR, interquartile range; met., metastasis; NR, not reached; NTX, N-telopeptide of type I collagen; OS, overall survival; Visc., visceral.