Iodine-131 Anti-B1 Antibody Consolidation for Patients With Non-Hodgkin's Lymphoma Following First-line CHOP

Hematology parameter grades were summarized according to the National Cancer Institute's (NCI) Common Terminology Criteria for Adverse Events (CTCAE), version 2.0. Grade 1, mild; Grade 2, moderate; Grade 3, severe; Grade 4, life-threatening or disabling; Grade 5, death. Data are presented for those participants who experienced Grade 4 toxicities. Grade 4 hematological toxicities included absolute neutrophil count (ANC) (calculated) <1000 cells/millimeters cubed (mm^3), white blood cells (WBC) <2000 cells/mm^3, platelets <50000 cells/mm^3, and hemoglobin < 8.0 grams/deciliter.

CR is defined as the complete disappearance of all detectable clinical/radiographic evidence of disease, the disappearance of all disease-related symptoms if present before therapy, and normalization of biochemical abnormalities definitely assignable to non Hodgkin's lymphoma (NHL). PR is defined as a >=50% decrease in the sum of perpendicular diameters (SPPD) of splenic and hepatic nodules determined at Baseline. SD is defined as less than a PR, but not PD, which is defined as a >=50% increase from nadir in SPPD of splenic and hepatic nodules or the appearance of any new lesion during or at the end of therapy that was >1.5 centimeters (cm) by radiographic evaluation or >1.0 cm by physical examination. RD is defined as the appearance of any new lesion or an increase of >= 50% in the size of nodules. Confirmed response requires that the same or better response be confirmed by two consecutive post-therapy response evaluations at least 4 weeks apart.

Duration of response for all participants with confirmed PR, confirmed CRu, or confirmed CR is defined as the time from the first documented response to the first documented progression. CR is defined as the complete disappearance of all detectable clinical/radiographic evidence of disease, the disappearance of all disease-related symptoms if present before therapy, and the normalization of biochemical abnormalities definitely assignable to NHL. PR is defined as a >=50% decrease in the sum of the perpendicular diameters (SPPD) of splenic and hepatic nodules determined at Baseline. PD is defined as a >=50% increase from nadir in SPPD of splenic and hepatic nodules or the appearance of any new lesion during or at the end of therapy that was >1.5 centimeters (cm) by radiographic evaluation or >1.0 cm by physical examination. Confirmed response requires that the same or better response be confirmed by two consecutive post-therapy response evaluations at least 4 weeks apart.

PFS is defined as the time from the start of treatment to the first documented progression or death. Duration measures were calculated using Kaplan-Meier techniques. Disease progression was based on radiographic or photographic evidence, and assessments were made by the investigator. PD is defined as a >=50% increase from nadir in SPPD of splenic and hepatic nodules or the appearance of any new lesion during or at the end of therapy that was >1.5 centimeters (cm) by radiographic evaluation or >1.0 cm by physical examination.

TTF is defined as the time from the start of treatment to the first occurrence of treatment withdrawal, decision to seek additional therapy, study removal, disease progression, or death. Duration measures were calculated using Kaplan-Meier techniques. Disease progression was based on radiographic or photographic evidence, and assessments were made by the investigator. PD is defined as a >=50% increase from nadir in SPPD of splenic and hepatic nodules or the appearance of any new lesion during or at the end of therapy that was >1.5 centimeters (cm) by radiographic evaluation or >1.0 cm by physical examination.

TBRT is the time at which the activity of infusion is 37% of that at time zero. Whole body images from anterior and posterior gamma camera scans were collected to assess dosimetry. The assessment of organ dosimetry required gamma camera scans from at least 4 time points. Nuclear medicine reviewers conducted a visual examination of the gamma camera scans and calculated the TBRTs. Residence time is calculated from the rate of total body clearance of iodine I-131 radioactivity during the dosimetric dose. Residence time is a measure of how long the drug resides in the body.

An AE is defined as any untoward medical occurrence in a participant administered a pharmaceutical product and does not necessarily have to have a casual relationship with this treatment. An AE can therefore be any unfavorable and unintended sign, symptom, or significant worsening of a pre-existing sign or symptom, or disease temporally associated with the use of a medicinal product. An SAE is defined as any experience occurring at any dose that results in the following outcomes: death, a life-threatening adverse experience, in-patient hospitalization or prolongation of existing hospitalization, a persistent or significant disability/incapacity, or a congenital anomaly/birth defect. See the SAE/AE module for a complete list of SAEs/AEs.

Hematology toxicities included ANC (calculated), WBC count, platelet count, and hemoglobin. Time to recovery to Baseline grade for participants with Grade 0 toxicity at Baseline was defined as the time from the date of the last administration of study drug to the first post-nadir date with Grade 0 toxicity, with no other Grade 1-4 toxicities recorded during the next week. For participants with a Grade 1-4 toxicity at Baseline, time to recovery was defined as the time from the last administration of study drug to the first post-nadir date with a Baseline grade or better, with no other higher grade toxicities recorded during the next week. For participants with a nadir grade less than or equal to the Baseline grade, the time to recovery to the Baseline grade equaled the time to nadir.

Hematology toxicities included ANC (calculated), hemoglobin, platelet count, WBC count. Nadir is defined as lowest counts that the cells reach after chemotherapy.

Hematology toxicities included ANC (calculated), WBC count, platelet count, and hemoglobin. Nadir is defined as the lowest counts (for ANC, WBC, and platelet counts)/concentration (for hemoglobin) that the cells reach after chemotherapy. Time to nadir is defined as the time from Baseline to the lowest value recorded up to 120 days following the therapeutic dose.

During the administration of unlabeled Anti-B1 antibody and Iodine-131 Anti-B1 antibody, emergency support for anaphylaxis, including epinephrine, diphenhydramine, hydrocortisone, a laryngoscope, and an endotracheal tube, was readily available. The use of steroids were discouraged unless other measures were ineffective.

The number of participants who developed human anti-murine (mouse) anibodies (HAMA) after treatment was measured.

Overall survival (time to death) is defined from the start of treatment to the date of death from any cause.