Risk and impact of tuberculosis in patients with multiple myeloma.

We investigated the risk and impact of mycobacterium tuberculosis (TB) infection in patients with multiple myeloma (MM). We identified 3979 MM patients from Taiwan's National Health Insurance database between 2000 and 2011 and compared the incidence rates of TB infection in these patients with 15,916 randomly selected age-, sex-, and comorbidity-matched subjects without MM. The risk of TB was higher in the myeloma cohort (adjusted hazard ratio [HR] 3.11, 95% confidence interval [CI] 2.41-4.02). Risk factors for MM patients contracting TB were age ≥65 (adjusted HR 1.93, 95% CI 1.19-3.15), alcohol use disorder (adjusted HR 2.86, 95% CI 1.24-6.62), and steroid daily dose equivalent to prednisone 5 mg or more (adjusted HR 2.38, 95% CI 1.50-3.77). MM patients with TB had a higher mortality risk than those without (adjusted HR 2.03, 95% CI 1.54-2.67). The incidence of TB is significantly higher in MM patients.