Randomized Phase II Study of Ixabepilone Alone and Ixabepilone Plus Cetuximab as First-Line Treatment for Female Subjects With Triple Negative Locally Advanced Non-resectable and/or Metastatic Breast Cancer

Progression Free Survival (PFS)

PFS is defined as the time interval from date of randomization until the first date of documented progressive disease (PD) or death from any cause without prior documentation of progression. The PFS was estimated using the Kaplan-Meier product-limit method, and a two-sided 95% CI for the median PFS time was computed using the method of Brookmeyer and Crowley. PD: At least 20% increase in sum of LD of target lesions in reference to smallest sum LD recorded at or following baseline or unequivocal progression of existing non-target lesion(s) overall.

Time frame: From the date of randomization to date of progression, death, or last tumor assessment (maximum participant PFS of 17 months)

Time to Response

Time to response is defined as the time from the date of start of treatment until measurement criteria are first met for PR or CR (whichever is recorded first). CR: Disappearance of all target and non-target lesions. PR: At least 30% reduction from baseline in the sum of the LD of all target lesions with reference to the baseline sum LD. Time to response was estimated using the Kaplan-Meier product-limit method.

Time frame: Assessed every 6 weeks for first 12 months from randomization thereafter every 3 months until CR or PR (maximum participant time to response of 18.3 weeks.)

Duration of Response

Defined as period from the time that measurement criteria are first met for CR or PR until first date of documented PD or death. Estimated using the Kaplan-Meier product-limit method; CI was computed using Brookmeyer and Crowley method. CR: Disappearance of all target and non-target lesions. PR: At least 30% reduction from baseline in the sum of LD of all target lesions with reference to baseline sum LD. PD: At least 20% increase in sum of LD of target lesions in reference to smallest sum LD recorded at or following baseline or unequivocal progression of existing non-target lesion(s) overall.

Time frame: From the date of first PR or CR assessment to date of progression, death, or last tumor assessment (maximum participant duration of response of 15.6 months)

Number of Participants With Death as Outcome, Serious Adverse Events (SAEs), Adverse Events (AEs), and AEs Leading to Discontinuation of Study Therapy Per National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) Version 3.0

AE: New untoward medical occurrence or worsening of a preexisting medical condition that does not have causal relationship with this treatment. SAE: Untoward medical event that at any dose: results in death, persistent or significant disability/incapacity, drug dependency/abuse; life-threatening, an important medical event, a congenital anomaly/birth defect; requires inpatient hospitalization/prolongs existing hospitalization. Grade (GR) 3=Severe; and GR4=Life-threatening or disabling. Other reasons for death included hepatic failure and respiratory distress.

Time frame: Assessed from the date of first dose until at least 30 days after the last dose of study drug. Median time on ixapebilone therapy was 15 weeks (range: 3-54 weeks for ixabepilone arm; 3-36 weeks for ixabepilone+cetuximab arm)

Number of Participants With Hematology Abnormalities

Grading: NCI CTCAE, Version 3.0. GR1=mild, GR2=moderate, GR3=severe, GR4=life threatening or disabling. Normal ranges provided by local laboratory and may also vary by age and sex. Hemoglobin:GR1=\<LLN-10.0g/dL; GR2=\<10.0-8.0g/dL; GR3:\<8.0-6.5g/dL, GR4:\<6.5g/dL. Platelets:GR1=\<LLN-75.0\*10\^9/L; GR2=\<75.0-50.0\*10\^9/L; GR3:\<50.0-25.0\*10\^9/L, GR4:\<25.0\*10\^9/L. Absolute Neutrophil Count (ANC):GR1=\<LLN-1.5\*10\^9 /L; GR2=\<1.5-1.0\*10\^9/L; GR3:\<1.0-0.5\*10\^9/L; GR4:\<0.5\*10\^9/L. White blood cell (WBC):GR1=\<LLN-3.0\*10\^9/L; GR2=\<3.0-2.0\*10\^9/L; GR3:\<2.0-1.0\*10\^9/L; GR4:\<1.0\*10\^9/L. LLN=lower limit of normal.

Time frame: Assessed prior to 1st cycle, at beginning of each cycle, weekly (cetuximab treatment), and every 4 weeks within 30 days after last dose of study drug. Median time on ixapebilone therapy: 15 weeks (range:3-54:ixabepilone arm;3-36:ixapebilone+cetuximab arm)

Number of Participants With Serum Chemistry Abnormalities

Grading: NCI CTCAE, Version 3.0. GR1=mild, GR2=moderate, GR3=severe, GR4=life threatening or disabling. Normal ranges provided by local laboratory and may also vary by age and sex. Alanine aminotransferase, aspartate aminotransferase, and alkaline phosphatase: GR1=\>ULN-2.5\*ULN (upper limit of normal); GR2=\>2.5-5.0\*ULN; GR3=\>5.0-20.0\*ULN; GR4:\>20.0\*ULN. Total bilirubin:GR1=\>ULN-1.5\*ULN, GR2=\>1.5-3.0\*ULN, GR3=\>3-10\*ULN, GR4=\>10\*ULN. Creatinine: GR1=\>ULN-1.5\*ULN, GR2=\>1.5-3.0\*ULN, GR3=\>3.0-6.0\*ULN, GR4=\>6.0\*ULN.

Time frame: Assessed prior to 1st cycle, at beginning of each cycle, weekly (cetuximab treatment), and every 4 weeks within 30 days after last dose of study drug. Median time on ixapebilone therapy: 15 weeks (range:3-54:ixabepilone arm;3-36:ixapebilone+cetuximab arm)