Approval Probability
TA Base Rate
Adjusted LOA
ML Risk
Iodine-131 Anti-B1 Antibody Versus Anti-B1 Antibody in Chemotherapy-Relapsed/Refractory Low-Grade or Transformed Low-Grade Non-Hodgkin's Lymphoma · 1 trial · 1 indication
Responses had to be confirmed by 2 separate evaluations occurring \>=4 weeks apart. Par. with confirmed response include those with Complete Response (CR: complete resolution of all disease-related radiological abnormalities and the disappearance of all signs and symptoms related to the disease), Clinical Complete Response (CCR: complete resolution of all disease-related symptoms; residual foci, thought to be residual scar tissue, are present), or Partial Response (PR: \>=50% reduction in the sum of the products of the longest perpendicular diameters of all measurable lesions; no new lesions).
Participants receiving Unlabeled TST with progressive disease (defined as a \>=25% increase from the nadir value of the sum of the products of the longest perpendicular diameters of all measureable lesions or the appearance of any new lesion. Individual lesions must be \>2 centimeters \[cm\] in diameter by radiographic evaluation or \>1 cm in diameter by physical examination.) were assessed separately before and after receiving the crossover treatment of I 131 TST for confirmed response, which included participants with CR, CCR, and PR.
CR is defined as the complete resolution of all disease-related radiological abnormalities and the disappearance of all signs and symptoms related to the disease.
Responses had to be confirmed by 2 separate evaluations occurring \>=4 weeks apart. Par. with confirmed response include those with Complete Response (CR: complete resolution of all disease-related radiological abnormalities and the disappearance of all signs and symptoms related to the disease), Clinical Complete Response (CCR: complete resolution of all disease-related symptoms; residual foci, thought to be residual scar tissue, are present), or Partial Response (PR: \>=50% reduction in the sum of the products of the longest perpendicular diameters of all measurable lesions; no new lesions).
Participants receiving Unlabeled TST with progressive disease were assessed separately before and after receiving the crossover treatment of I 131 TST for CR. CR is defined as the complete resolution of all disease-related radiological abnormalities and the disappearance of all signs and symptoms related to the disease.
CCR is defined as the complete resolution of all disease-related symptoms; residual foci, thought to be residual scar tissue, are present. Generally, an unchanging lesion =\<2 cm in diameter by radiographic evaluation or =\<1 cm in diameter by physical examination can be considered scar tissue.
Participants receiving Unlabeled TST with progressive disease were assessed separately before and after receiving the crossover treatment of I 131 TST for CCR. CCR is defined as the complete resolution of all disease-related symptoms; residual foci, thought to be residual scar tissue, are present. Generally, an unchanging lesion =\<2 cm in diameter by radiographic evaluation or =\<1 cm in diameter by physical examination can be considered scar tissue.
CCR is defined as the complete resolution of all disease-related symptoms; residual foci, thought to be residual scar tissue, are present. Generally, an unchanging lesion =\<2 cm in diameter by radiographic evaluation or =\<1 cm in diameter by physical examination can be considered scar tissue. The extent of disease must be unchanged or decreased upon follow-up evaluations. If the extent of disease was unchanged or if further decreases occurred for 6 months or longer, the participant was reclassified as having a CR.
Participants receiving Unlabeled TST with progressive disease were assessed separately before and after receiving the crossover treatment of I 131 TST for CR + CCR.
Confirmed PR is defined as a \>=50% reduction in the sum of the products of the longest perpendicular diameters of all measurable lesions, with no new lesions.
Participants receiving Unlabeled TST with progressive disease were assessed separately before and after receiving the crossover treatment of I 131 TST confirmed PR. Confirmed PR is defined as a \>=50 percent reduction in the sum of the products of the longest perpendicular diameters of all measurable lesions, with no new lesions.
| Arm | Type | Description |
|---|---|---|
| Open-label, two-arm, Arm A and Arm B Crossover | EXPERIMENTAL | Arm A Dosimetric Dose: 450 mg of TST infused over 70 minutes (inclusive of a 10-minute flush) immediately followed by 5 milliCurie (mCi) (35 mg) of I-131 TST infused over 30 minutes (inclusive of a 10-minute flush).• Therapeutic Dose: Seven to 14 days after the dosimetric dose, 450 mg of TST infused over 70 minutes (inclusive of a 10-minute flush) immediately followed by a subject-specific mCi activity (35 mg) of I-131 TST to deliver the desired total body dose (TBD) infused over 30 minutes (inclusive of a 10-minute flush). The desired TBD was 65 cGy for subjects with a baseline platelet count of 100,001-149,999 cells/mm3 and 75 cGy for subjects with a baseline platelet count ≥150,000 cells/mm3. Obese subjects (subjects weighing more than 137% of their calculated lean body weight) were dosed based upon 137% of their calculated lean body mass |
| Arm B Crossover | EXPERIMENTAL | Arm B Dosimetric Dose: 450 mg of TST infused over 70 minutes (inclusive of a 10-minute flush) immediately followed by 35 mg of TST infused over 30 minutes (inclusive of a 10-minute flush).Therapeutic Dose: Seven to 14 days after the dosimetric dose, 450 mg of TST infused over 70 minutes (inclusive of a 10-minute flush) immediately followed by 35 mg of TST infused over 30 minutes (inclusive of a 10-minute flush). Subjects randomized to Arm B were allowed to cross-over and receive TST/ I-131 TST once their disease had progressed. |
| Name | Type | Description |
|---|---|---|
| Iodine-131 Anti-B1 Antibody Versus Anti-B1 Antibody in Chemotherapy-Relapsed/Refractory Low-Grade or Transformed Low-Grade Non-Hodgkin's Lymphoma (NHL) | BIOLOGICAL | Subjects will be randomized to receive tositumomab and iodine-131 tositumomab (Arm A) or unlabeled tositumomab (Arm B). Subjects randomized to receive unlabeled tositumomab may crossover and receive radiolabeled Iodine-131 tositumomab following progression of their lymphoma. Response in both arms will be assessed at 7 weeks, 13 weeks, and then at 3-monthly intervals for up to 2 years. |
Inclusion Criteria: * Histologically confirmed low-grade or transformed NHL with evaluable, measurable disease * Tumor had to express CD20 antigen * One to three prior chemotherapy regimens * Karnofsky performance score ≥60% and anticipated survival ≥3 months * Absolute neutrophil count (ANC) \>150...