Correction of Anaemia and Progression of Renal Failure on Transplanted Patients

The number of patients arriving each year at the stage of final renal insufficiency (IRT) and requiring the dialysis of substitution does not cease growing, in parallel with continuous ageing of the population in industrialized countries. The incidence of the IRT is approximately 110 new patients per million inhabitants per year, which represents an annual progression from approximately 4% to 8% according to areas.Approximately 35000 patients are currently treated by dialysis, 90% by hemodialysis and 10% per peritoneal dialysis . The other alternative to the treatment of the IRT is renal transplantation. Approximately 2000 patients are transplanted each year in France, and it is estimated that a minimum of 3000 transplantations should annually be carried out in order to answer at the request of the patients registers on a chronic program of dialysis and in to be transplanted age.

The total number of patients living with a functional graft is approximately 15000.

The IRT is a major problem of public health and its cost is considerable: for less than 50000 patients, this one represents nearly 4% of the annual budget of the social security. To slow down the progression of the IRC represents a major therapeutic challenge, including at the transplanted patients.

The physiopathological mechanisms proposed to explain the harmful role of anaemia in the progression of the renal lesions during the IRC rest on the tissue hypoxia induced by the reduction in haemoglobin. The tissue hypoxia supports the development of the interstitial fibrosis by stimulating the production of type I collagen and some inhibitors of metalloproteases, implied in the extracellular matrix degradation. The hypoxia also stimulates the synthesis of TGF-beta, pro-fibrosing factors implied in the progression of many renal diseases, in particular the nephropathy diabetic. By reducing the hypoxia thanks to the correction of anaemia by the EPO, one can hope to slow down the progression of the interstitial fibrosis, and thus the progression of the renal insufficiency. Lastly, the correction of anaemia reduces resistance to insulin and the secondary hyperinsulinism to uraemia, improves the dyslipidemia and the oxidizing stress, factors also implied in the progression of many nephropathies, diabetic or not.

It appears that anaemia is a factor of risk of progression of the chronic nephropathies. To slow down the progression of the chronic dysfunction of the graft is an important challenge because of shortage of graft and impossibility, in the current state of the French centers of renal transplantation to carry out the number of necessary grafts to provide for the current waiting list. Our hypothesis, if it is checked, should make it possible to very appreciably improve the quality of life of the transplanted patients and to slow down the progression of their IRC, thus delaying the duration before return in dialysis.

Population: Renal patients transplanted since at least 12 months, presenting a CGD defined by 20 ml/mn/1,73 m2 > Clcr < 50 ml/mn/1,73 m2 and an anaemia (Hb < 11,5 g/dl)

The patients answering the criteria of selection will be assigned by randomization with the one of the two following groups:

• Group a: target haemoglobin: 13 to 15 g/dl
• Group b: target haemoglobin: 10,5 to 11,5 g/dl

Criteria of inclusion

• Adults of male or female sex of more than 18 years
• Patients having profited from one 1st or one the 2nd renal Transplantation
• Patients Transplanted since more than 1 year
• Patients having a CGD defined by Clcr < 50 ml/mn/1,73 m2
• Patients presenting an anaemia: Hb lower than 11,5 g/dl
• Absence of deficiency out of iron
• Patients having given their in writing consent

Study Treatment: Neorecormon® (Epoétine beta) under cutaneous injection

The objective of the study is to show a difference between group A "haemoglobin target: 13 to 15 g/dl" and group it B "haemoglobin target: 10,5 to 11,5 g/dl", with regard to the renal function.

The calculation of the number of patients is thus based on a model of covariance analysis in repeated measurements of clearance of creatinin on the whole of the times evaluated between J0 and M24 and on the following hypothesis:

• H0: no effect groups during the two years of follow-up
• H1: Effect groups, evolution different from the values of Clcr during the follow-up

The alfa-risk (probability of rejecting H0 wrongly) was fixed at 5% The beta-risk (probability of keeping H0 wrongly) at 10% The total number of patients to be randomized was estimated at 140 (70 by group) This number of patients will also make it possible to test the scores of quality of life with a power higher than 90%