In recent years, expanded hemodialysis has been the subject of studies, many of them done on small populations, with limited observation periods and not always unambiguous results. In the literature, there are data comparing HDx and high-flow hemodialysis in terms of small- and medium-molecule purification and control of inflammation indices; there are fewer data comparing HDx and HDF online. In contrast, there are no studies in the literature comparing HDx with HFR. With a view to personalizing therapy, demonstrating the equivalence/superiority of HDx over the other dialysis techniques under consideration could make this technique suitable precisely for that class of more malnourished and more frail patients who to date do not obtain benefits from the other methods. The objective of the study is the mid-term (12-month) evaluation and comparison of the MCO filter called Theranova 400™ (1.7 m2, steam sterilization, cut-off 25 Kda, Baxter, Heichingen, Germany) with high-flux hemodialysis (HF-HD), OL- HDF and hemodiafiltration with endogenous reinfusion (HFR) with HFR filter 17 , in combination with medical therapy under normal clinical practice, in terms of purification of low and medium molecular weight uremic toxins, control of baseline inflammatory status and erythropoietin resistance in patients with chronic renal failure undergoing hemodialysis treatment.