What question did this study set out to answer?

To describe mortality rates among men with prostate cancer categorized by the presence of bone metastasis and skeletal related events.

Skeletal Related Events, Bone Metastasis and Survival of Prostate Cancer: A Population Based Cohort Study in Denmark (1999 to 2007)

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Cohort study demonstrates sharply reduced survival in men with prostate cancer, highlighting the severe prognostic toll of skeletal metastases.

To describe mortality rates among men with prostate cancer categorized by the presence of bone metastasis and skeletal related events.
Conducted a population-based cohort study of 23,087 incident prostate cancer patients identified from the Danish National Patient Registry between 1999 and 2007 with a median follow-up of 2.2 years.
Calculated cumulative incidence and survival using the Kaplan-Meier method, and estimated adjusted mortality rate ratios using a Cox proportional hazard model controlling for age and comorbidity.
One- and 5-year survival rates were 87% and 56% in patients without bone metastasis, 47% and 3% in those with bone metastasis, and 40% and less than 1% in those with both bone metastasis and skeletal related events.
Compared to men without bone metastasis, the adjusted 1-year mortality rate ratio was 4.7 (95% CI 4.3–5.2) for bone metastasis without skeletal related events and 6.6 (95% CI 5.9–7.5) for bone metastasis with skeletal related events.

Nørgaard et al. (2010) studied this question.

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Cohort study demonstrates sharply reduced survival in men with prostate cancer, highlighting the severe prognostic toll of skeletal metastases.