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Background : Since glucocorticoids are used in low maintenance doses today, the relationship between calcineurin inhibitors (CNI) and osteoporosis has become clinically significant in osteoporosis after solid organ transplantation. However, there is evidence that the mammalian target of rapamycin inhibitors (mTORi) may be beneficial via osteoclast inhibition. Objective : The bone mineral density (BMD) changes are investigated in renal transplant patients under CNI or mTORi-based maintenance regimens during the first five-year post-transplant course. Methods : This study consists of thirty-three renal allograft recipients with less than one year of dialysis history. The exclusion criteria were: being older than 50 years old, history of bisphosphonate use, parathyroidectomy, CNI-mTORi switch after the post-transplant third month, diuretic use, and history of malignancy. First and fifth-year BMD scores and simultaneous laboratory parameters were evaluated. Results : CNI (n=21) and mTORi group (n=12) had similar demographics, dialysis vintages, first and fifth-year serum parathormone, calcium, phosphate, magnesium, alkaline phosphatase, and 25-OH-vitamin D levels. The femur neck scores of the CNI group decreased from -0.82 (±0.96) to -1.52 (±0.92) (p=0.020). We observed a significant decrease in the CNI group compared to the mTORi group [-0.70 (±0.68) and 0.30 (±0.36), respectively; p&lt;0.01] when the BMD score changes were evaluated among years. The mean femur neck score of the mTORi group increased insignificantly from -1.13 (±0.65) to -0.82 (±0.56) at the fifth-year DXA scan (p=0.230). Similar trends were also observed in L1-4 scores. Conclusion : Our study suggests that CNI-based treatment is associated with decreased femur neck BMD scores, and mTORi-based treatment tends to be beneficial in the post-transplant five-year follow-up.

The Effects of CNI and Mtori-Based Regimens on Bone Mineral Density After Renal Transplantation