Phase 2 Study of SPI-2012 or Pegfilgrastim for the Management of Neutropenia in Participants With Breast Cancer

DSN was defined as the interval from the day of first observation of severe neutropenia (ANC <0.5*10^9/L, Grade 4 neutropenia per NCI CTCAE) to the first ANC recovery to => 2.0*10^9/L in Cycle 1.

DSN was defined as the interval from the day of first observation of severe neutropenia (ANC <0.5*10^9/L, Grade 4 neutropenia per NCI CTCAE) to the first ANC recovery to => 2.0*10^9/L in Cycle 2.

DSN was defined as the interval from the day of first observation of severe neutropenia (ANC <0.5*10^9/L, Grade 4 neutropenia per NCI CTCAE) to the first ANC recovery to => 2.0*10^9/L in Cycle 3.

DSN was defined as the interval from the day of first observation of severe neutropenia (ANC <0.5*10^9/L, Grade 4 neutropenia per NCI CTCAE) to the first ANC recovery to => 2.0*10^9/L in Cycle 4.

Time to ANC recovery was defined as the time from chemotherapy administration until ANC increased to ≥ 2×10^9/L after the expected nadir within Cycle 1. Time to ANC recovery was not calculated for participants whose ANC value didn't drop below 2 x10^9/L within Cycle 1.

Time to ANC recovery was defined as the time from chemotherapy administration until ANC increased to ≥2×10^9/L after the expected nadir within Cycle 2. Time to ANC recovery was not calculated for participants whose ANC value didn't drop below 2 x10^9/L within Cycle 2.

Time to ANC recovery was defined as the time from chemotherapy administration until ANC increased to ≥2×10^9/L after the expected nadir within Cycle 3. Time to ANC recovery was not calculated for participants whose ANC value didn't drop below 2 x10^9/L within Cycle 3.

Time to ANC recovery was defined as the time from chemotherapy administration until ANC increased to ≥2×10^9/L after the expected nadir within Cycle 4. Time to ANC recovery was not calculated for participants whose ANC value didn't drop below 2 x10^9/L within Cycle 4.

Mean ANC nadir was defined as the mean of the lowest ANC value (*10^9/L) after administration of the study drug (SPI-2012 or pegfilgrastim) on any day in Days 1-3 of Cycle 1.

Mean ANC nadir was defined as the mean of the lowest ANC value (*10^9/L) after administration of the study drug (SPI-2012 or pegfilgrastim) on any day in Days 1-3 of Cycle 2.

Mean ANC nadir was defined as the mean of the lowest ANC value (*10^9/L) after administration of the study drug (SPI-2012 or pegfilgrastim) on any day in Days 1-3 of Cycle 3.

Mean ANC nadir was defined as the mean of the lowest ANC value (*10^9/L) after administration of the study drug (SPI-2012 or pegfilgrastim) on any day in Days 1-3 of Cycle 4.

Depth of ANC nadir was defined as the lowest Median ANC value (*10^9/L) after administration of the study drug (SPI-2012 or pegfilgrastim) on any day in Days 1-3 of Cycle 1.

Depth of ANC nadir was defined as the lowest Median ANC value (*10^9/L) after administration of the study drug (SPI-2012 or pegfilgrastim) on any day in Days 1-3 of Cycle 2.

Depth of ANC nadir was defined as the lowest Median ANC value (*10^9/L) after administration of the study drug (SPI-2012 or pegfilgrastim) on any day in Days 1-3 of Cycle 3.

Depth of ANC nadir was defined as the lowest Median ANC value (*10^9/L) after administration of the study drug (SPI-2012 or pegfilgrastim) on any day in Days 1-3 of Cycle 4.

Time to ANC nadir was defined as the time from chemotherapy administration until the occurrence of the ANC nadir.

Time to ANC nadir was defined as the time from chemotherapy administration until the occurrence of the ANC nadir.

Time to ANC nadir was defined as the time from chemotherapy administration until the occurrence of the ANC nadir.

Time to ANC nadir was defined as the time from chemotherapy administration until the occurrence of the ANC nadir.

FN was defined as a temperature of more than 38.2 degree Celsius (°C) concurrent with an ANC greater than 0.5×10^9/L..

An AE was any untoward medical occurrence in a participant who received study treatment without regard to possibility of causal relationship. An SAE was an AE resulting in any of following outcomes or deemed significant for any other reason: death, initial or prolonged inpatient hospitalization, life-threatening experience (immediate risk of dying), persistent or significant disability or incapacity, congenital anomaly. Participants with SAE other than death were reported.AE and Laboratory Abnormalities ("Hematology and Chemistry") were collected and graded as per National Cancer Institute Common Terminology Criteria for Adverse Events (NCI-CTCAE) Version 4.03, where Grade 3 refers to severe or medically significant but not immediately life threatening; hospitalization or prolongation of hospitalization indicated and Grade 4 refers to life-threatening consequences; urgent intervention indicated.

Serum samples were to be tested in a screening assay for antibodies binding to SPI-2012 using a validated enzyme-linked immunosorbent assay (ELISA). Any serum samples positive for the antibody were to be tested in a confirmatory competitive inhibition assay using two antigens, SPI-2012 or granulocyte colony-stimulating factor (G-CSF), to confirm the presence of antibodies binding to SPI-2012 and to identify samples that were positive for antibodies binding to G-CSF.

Blood samples were collected at specific time points to determine the serum concentrations of SPI-2012 and to derive pharmacokinetic (PK) parameters.

Blood samples were collected at specific time points to determine the serum concentrations of SPI-2012 and to derive PK parameters.

AUC(0-312) is the area under the serum concentration-time curve from time zero to 312 hour post dose calculated by the linear trapezoidal rule. Blood samples were collected at specific time points to determine the serum concentrations of SPI-2012 and to derive PK parameters.

t1/2 data were calculated and reported as harmonic mean and pseudo standard deviation (SD). Blood samples were collected at specific time points to determine the serum concentrations of SPI-2012 and to derive PK parameters.