Bone Status in Patients with Monoclonal Gammopathy of Undetermined Significance: A Case-Control Study.

OBJECTIVE

The objective of the study was to assess the prevalence of osteoporosis in patients with monoclonal gammopathy of undetermined significance (MGUS) and to determine the associated factors.

MATERIALS AND

METHODS

we conducted a case-control study, between January 2019 and April 2019, including patients with MGUS and age- and sex-matched healthy controls (one patient/three controls). For all participants, demographic and clinical data were collected as results of bone mineral density by two-photon X-ray absorptiometry at the lumbar spine and femoral neck.

RESULTS

In our series, we included 120 participants: 30 patients with MGUS and 90 healthy controls. In the MGUS carrier group, the mean age was 66.26 ± 8.61 years. The mean monoclonal peak was 11.57 g/L. Densitometric osteoporosis was noted in 12 (40%) patients with MGUS versus 17 (18.9%) in the control group ( P = 0.021). In addition, only one patient with MGUS had a vertebral fracture. On multivariate analysis, associated factors with osteoporosis in the MGUS group were age (odds ratio [OR] = 1.14; confidence interval [CI] [1.03-1.26]; P < 0.05) and previous fracture (OR = 3.03; CI [1.22-15.06]; P < 0.05).

CONCLUSION

Our study suggests an increased risk of osteoporosis in patients with MGUS.