The blood level of lipoprotein A (Lp(a)) is linked to mutations in gene 6 and is associated with atherothrombotic risk and clinical manifestations such as myocardial infarction, ischemic stroke, and aortic valve calcification and stenosis. Several studies show an increased cardiovascular risk for a level >125 nmol/L. Patients with severe chronic kidney disease (CKD) or on hemodialysis are at high cardiovascular risk, and Lp(a) levels would allow for better reclassification of this cardiovascular risk in the general population.

The study authors wished to the heterogeneity of the Lp(a) level in the population with CKD stages 4 without renal replacement therapy and to identify whether a high Lp(a) level is associated with cardiovascular comorbidity defined by the presence of cardiovascular comorbidity after adjustment for known risk factors such as diabetic status, obesity, smoking, LDLc level and medical treatment for cardiovascular prevention (statins, etc.). Furthermore, they will evaluate whether there is a link between a high level (> 125 mmol/l) of Lp(a) at inclusion in the cohort and the occurrence of cardiovascular or renal events (i.e. death of cardiovascular origin or occurrence of MI, stroke, stage 4 peripheral artery disease (PAD) or initiation of renal replacement) over a follow-up period of 18 months which could raise questions about the benefit of a specific treatment which remains to be evaluated.

Inclusion Criteria:

• The patient must have given their free and informed consent and signed the consent form
• The patient must be a member or beneficiary of a health insurance plan
• Patient being followed at the Nîmes University Hospital for stage 4 chronic kidney disease without replacement therapy
• Patient available for follow-up at 18 months

Exclusion Criteria:

• The subject is participating in an interventional study, or is in a period of exclusion determined by a previous study
• The subject refuses to sign the consent
• It is impossible to give the subject informed information
• The patient is under safeguard of justice or state guardianship
• Familial hypercholesterolemia
• Morbid obesity (BMI > 40 kg/m2).
• Persons deprived of their liberty by a judicial or administrative decision, persons receiving psychiatric care, and persons admitted to a health or social care facility for purposes other than research (Article L1121-6 of the French Public Health Code)

Patients with stage 4 chronic kidney disease without replacement therapy followed as outpatients at Nîmes University Hospital.