A Study of Patients Treated With Erythropoietin Receptor Agonists for Anemia Who Developed Anti-erythropoietin Antibodies

• Status: Withdrawn
• Trial end date: 2010-01-01
• Target enrollment: 0
• Participant gender: All

Summary

The purpose of this study is to assess the presence of anti erythropoietin antibodies (anti EPO Ab) in participants responding to any erythropoietin receptor agonist (ERA) therapy to treat or prevent anemia without loss of effectiveness to see if they will develop pure red cell aplasia or loss of effectiveness to recombinant erythropoietin and to measure the duration of effectiveness of ERA therapy.

• Accepts Healthy Volunteers?: No

Details

• Lead Sponsor: Johnson & Johnson Pharmaceutical Research & Development, L.L.C.
• Treatments: Antibodies; Epoetin Alfa; Immunoglobulins

Criteria

Inclusion Criteria:

• Receiving any ERA therapy for any cause of anemia and having responded to the ERA therapy for at least 3 months

• Positive or borderline serum for antibodies to erythropoietin identified by serum radioimmunoprecipitation

• Maintained a stable hemoglobin within a 3-month period that has not decreased more than 2 g/dL in any 1-month period and with no increase in red blood cell transfusion requirement

• An ERA maintenance dose that has not increased more than 50 percentages from initial effective dose

• If blood count information is available, must have a count of reticulocytes (immature red blood cells) greater than or equal to 30 million/L

Exclusion Criteria:

• Stem cell or bone marrow transplantation

• Treatment with medication that decreases the ability of the immune system to function normally, within the last 3 months

• Participants who have shown a loss of effectiveness to ERA therapy, defined as participants who initially responded to treatment for anemia [a rise in hemoglobin which lasted for a minimum of 3 months] followed by an unexplained decrease in hemoglobin (greater than or equal to 2 g/dL) within a 1-month period