A Study to Assess Immune Response in Pediatric Kidney Transplant Recipients Treated With Daclizumab (Zenapax)

Positive antibody response was defined as at least a 2-fold increase in antibody concentration on either Day 43 or Day 57 compared with baseline where baseline was assigned a value of 1 if it was below the limit of quantification. All humoral responses were assessed by enzyme-linked immunosorbent assay (ELISA).

Positive cellular response was defined as an increase in the 5-bromo-2-deoxyuridine (BrdU) percent total net of at least 1.5-fold compared with baseline, where baseline was assigned a value of 0.5 if <=0, on at least one time point on Days 22, 29, 43 or 57. All cellular responses were assessed by BrdU proliferation assay.

Positive antibody response was defined as at least a 2-fold increase in antibody concentration on either Day 43 or Day 57 compared with baseline where baseline was assigned a value of 1 if it was below the limit of quantification. Positive cellular response was defined as an increase in the 5-bromo-2-deoxyuridine (BrdU) percent total net of at least 1.5-fold compared with baseline, where baseline was assigned a value of 0.5 if <=0, on at least one time point on Days 22, 29, 43 or 57. All humoral responses were assessed by ELISA and all cellular responses were assessed by BrdU proliferation assay.

Humoral response to TT was defined as >=1.5 fold increase in antibody concentration from baseline in participants with protective anti-TT IgG level >=0.1 IU/mL. All humoral responses were assessed by ELISA.

Positive cellular response was defined as an increase in the BrdU percent total net of at least 1.5-fold compared with baseline, where baseline was assigned a value of 0.5 if <=0, on at least one time point on days 22, 29, 43 or 57. All cellular responses were assessed by BrdU proliferation assay.

Positive antibody response was defined as at least a 2-fold increase in antibody concentration on either Day 43 or Day 57 compared with baseline where baseline was assigned a value of 1 if it was below the limit of quantification. Positive cellular response was defined as an increase in the 5-bromo-2-deoxyuridine (BrdU) percent total net of at least 1.5-fold compared with baseline, where baseline was assigned a value of 0.5 if <=0, on at least one time point on Days 22, 29, 43 or 57. All humoral responses were assessed by ELISA and all cellular responses were assessed by BrdU proliferation assay.

Nonresponders (participants who failed to mount cellular responses to KLH) were rechallenged with KLH 6 months after Day 29 (Day 196). For nonresponders, positive cellular response to KLH was defined as an increase in the 5-bromo-2-deoxyuridine (BrdU) percent total net of at least 1.5-fold compared with baseline, where baseline was assigned a value of 0.5 if <=0, on at least one time point up to Day 252. All cellular responses were assessed by BrdU proliferation assay.

Nonresponders (participants who mount humoral responses but no cellular responses to tetanus vaccination) were rechallenged with TT 6 months after Day 29 (Day 196). For nonresponders, positive cellular response to TT was defined as an increase in the BrdU percent total net of at least 1.5-fold compared with baseline, where baseline was assigned a value of 0.5 if <=0, at any time point up to Day 252. All cellular responses were assessed by BrdU proliferation assay.

Due to the small number of participants enrolled in the study, geometric means at Baseline and on Days 22, 29, 43 and 57 were not reported.

CD25 is an antigen that is present on a subset of peripheral blood lymphocytes. The expression of CD25+ on T cell was investigated using antibody 2A3. Blood samples were drawn for evaluation of CD25+ at screening and on Days 29, 57, and 168.

Blood samples were obtained for flow activated cell sorter (FACS) analyses of T cell subsets (CD3, CD4, and CD8) on Days 1, 22, 29, 43, and 57. These cells are present on white blood cells and are used as markers to associate cells with immune functions.

Blood samples were obtained for flow activated cell sorter (FACS) analyses of HLA-DR+, CD45RO+ and CD45RA+ on Days 1, 29, and 57. These cells are present on white blood cells and are used as markers to associate cells with immune functions.

Positive antibody response was defined as at least a 2-fold increase in antibody concentration on Month 6 compared with baseline where baseline was assigned a value of 1 if it was below the limit of quantification. All humoral responses were assessed by enzyme-linked immunosorbent assay (ELISA). Due to the small number of participants enrolled in the study, percentage of participants with positive antibody response to KLH immunization at Month 6 was not reported.

Nonresponders (participants who failed to mount antibody responses to KLH) were rechallenged with KLH 6 months after Day 29 (Day 196). For nonresponders, positive antibody response to KLH was defined as at least a 2-fold increase in antibody concentration at any time point up to Day 252 compared with baseline where baseline was assigned a value of 1 if it was below the limit of quantification. All humoral responses were assessed by enzyme-linked immunosorbent assay (ELISA).

DTH skin reactions were assessed 48 hours after each KLH immunization given on Day 1 and on Day 29. A positive response was defined as an induration >=5 mm.

An AE is defined as any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product. An SAE is defined as any untoward medical occurrence that, at any dose, results in death, is life threatening, requires hospitalization or prolongation of existing hospitalization, results in persistent or significant disability/incapacity, is a congenital anomaly/birth defect, or is a significant medical event in the investigator's judgment or requires intervention to prevent one or other of these outcomes