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Background and Aims Biologically, the cellular activity of the mTOR complexes depends on the balance between the catabolic and the anabolic inputs. Hence, we hypothesized that the metabolic side effects of mTOR inhibitors (mTORi) in kidney transplantation depend on the baseline metabolic status of the patient. Method The analysis included all the patients that have been transplanted in our Center between June 2013 to December 2016, completed one year of follow-up and did not change medication during the first year after kidney transplantation (per-protocol population, n=298). Outcomes chosen include de novo diabetes, 1-year difference from baseline in glycated hemoglobin (HbA1c), triglycerides and total cholesterol. Kidney transplant recipients were treated either with an mTORi (either Sirolimus or Everolimus, n=134) or Mycophenolic Acid (MPA, n=164). Both drugs were always accompanied by tacrolimus and steroids. Patients were stratified according to the treatment received (mTORi versus MPA) and the baseline metabolic status (diabetes mellitus type 2 and obesity). Differences among groups were analyzed with exact Fisher test and ANOVA test with LSD post-hoc analysis. Results We observed a strong difference for 1-year change in HbA1c depending on the baseline metabolic status of the patients (P&amp;lt;0.001 between groups, Figure 1a). The worst results were observed for patients with baseline diabetes. Among these, obese patients treated with mTORi had the higher increase in HbA1c (3.04 ± 1.18% from baseline, P&amp;lt;0.01 with all groups at post-hoc analysis). De-novo diabetes was more frequent in patients taking mTORi (23.4 vs. 13.1%), albeit not significantly (P=0.100) and without differences taking into account obesity as a covariate. Triglycerides increased substantially in patients without baseline diabetes and treated with mTORi (P&amp;lt;0.05). Surprisingly, in diabetic patients no differences were observed in triglycerides between mTORi and MPA groups (Figure 1b). There were no differences in the increase in total cholesterol among groups (P=0.155) (Figure 1c). Conclusion We observed that the 1-year increase in HbA1c and triglycerides attributable to mTORi after kidney transplantation depends on the baseline metabolic status of the patients. We propose that the metabolic side effects of mTORi depend on the balance between anabolic and catabolic inputs of every kidney transplant recipient.

P1761SIDE EFFECTS OF MTOR INHIBITORS DEPEND ON THE BASELINE METABOLIC STATUS OF KIDNEY TRANSPLANT RECIPIENTS