Thus, selection of patients based upon fracture risk, as determined by a combination of both BMD and clinical risk factors, is desirable. The recommendations by the National Osteoporosis Foundation (NOF)[12] to initiate drug therapy in those with hip or vertebral (clinical or asymptomatic) fractures apply to patients with PBC as it does the recommendation for drug therapy to those with a T-score ≤−2.5

at the femoral neck, total hip, or lumbar spine. In patients with PBC with a T-score between −1.0 and −2.5 (osteopenia), the decision to initiate drug therapy is less clear, although this subgroup of patients most likely would benefit from drug therapy as well.[10] Guidelines from the NOF[12] Metformin and the Endocrine Society[13] recommend drug therapy in postmenopausal women and men age 50 and older with osteopenia at the femoral neck, total hip, or lumbar spine when there is a 10-year hip fracture probability ≥3% or a 10-year major osteoporosis-related fracture probability ≥20% based on the World Health Organization (WHO) absolute fracture risk model or the Fracture Risk Assessment Tool (FRAX).[14, 15] The FRAX was introduced by the

WHO task force to estimate the 10-year probability of hip fracture and major osteoporotic fracture (hip, lumbar spine, proximal humerus, or forearm) for untreated patients between 40 and 90 years of age using easily obtainable clinical risk factors for fracture and femoral learn more neck BMD (g/cm2) using DXA.[15] However, the FRAX as a 上海皓元 guide for drug therapy in osteopenic PBC patients has not been investigated. A systematic review of 567 trials published

between 2005 and 2011 confirmed the fracture prevention efficacy of multiple agents, compared to placebo, in the general population.[16] Bisphosphonates (alendronate, risedronate, zoledronic acid, and ibandronate), denosumab, raloxifene, and teriparatide reduce the risk of vertebral fractures. Alendronate, risedronate, zoledronic acid, and denosumab reduce the risk of hip and other nonvertebral fractures. Unfortunately, data on efficacy and safety of these medications in patients with PBC are scarce or do not exist. In patients with PBC and osteoporosis, alendronate significantly improves bone density, when compared to placebo and etidronate.[17, 18] Other bisphosphonates had not been tested in patients with PBC until recently. In this issue of Hepatology, Guanabens et al. report on their results of a randomized trial comparing monthly ibandronate (150 mg) versus weekly alendronate (70 mg) given orally for 2 years to patients with PBC and either osteoporosis or with osteopenia plus a fragility fracture.[19] Forty-two patients were randomized, but only 33 completed the 2 years of treatment. The primary endpoint of the trial was adherence to treatment investigated by the Morisky-Green scale; at the end of the 2-year treatment period, adherence to treatment was significantly better with ibandronate than alendronate.