Study of Dasatinib (BMS-354825) in Patients With Advanced Estrogen/Progesterone Receptor-positive (ER+/PR+) or Her2/Neu-positive (Her2/Neu+)Breast Cancer

Tumor response was assessed according RECIST criteria: PR=at least 30% reduction in the sum of the LD of all target lesions in reference to the baseline sum LD, CR=Disappearance of all non-target lesions. Objective tumor response was defined as a PR or CR.

Tumor response was assessed according RECIST criteria: PR=at least 30% reduction in the sum of the LD of all target lesions in reference to the baseline sum LD, CR=Disappearance of all non-target lesions. Percentage of participants with objective tumor response was determined by the number of participants with PR or CR divided by the total number of response-evaluable participants.

Response assessed using Response Evaluation Criteria In Solid Tumors (RECIST) criteria: Complete Response (CR)=disappearance of all target and non-target lesions; Partial Response (PR)=≥30% decrease in sum of longest diameter (LD) of target lesions; SD=small changes not meeting above criteria; Progressive Disease (PD)=appearance of new lesion(s), ≥ 20% increase in the sum of the LD of target lesions, or progression of existing non-target lesions; Clinical Progression (cPD)=deterioration related to disease requiring treatment without radiographic PD.

Disease control was defined in response-evaluable participants as having a best response of CR or PR (or uPR), or SD at/after 16 Weeks.

Disease control was defined in response-evaluable participants as having a best response of objective response (CR or PR) or SD at/after 16 Weeks.

PFS was defined as time from first dosing date until the first date that Progressive Disease (PD) was observed.

PFS was defined as time from first dosing date until the first date that PD was observed. The distribution of PFS was estimated using the Kaplan-Meier product limit method. A two-sided 95% confidence interval (Brookmeyer and Crowley method) for the median PFS was computed.

PFS was defined as time from first dosing date until the first date that progressive disease (PD) was observed.

Duration of objective response was defined as the time (in weeks) between the first date that criteria for CR or PR were met and the first date that progressive disease (PD) or clinical progressive disease (cPD) was observed. Date of death was used as PD date for participants who died before reporting PD. Participants who neither progressed nor died were censored at the date of their last tumor assessment.

AE=any new untoward medical occurrence or worsening of a pre-existing medical condition which does not necessarily have a causal relationship with this treatment. AEs graded according to Common Terminology Criteria for Adverse Events (CTCAE) Version 3.0.

Normal ranges for laboratory abnormalities: granulocytes=1.5x10^3-8x10^3 mm^3 (range may have varied by institution); hemoglobin=12-16 g/dL; platelets=150-440x10^9c/L; partial thromboplastin time=27-37.1 seconds; alkaline phosphatase=38-126 U/L; alanine aminotransferase=15-48 U/L; aspartate aminotransferase=14-38 U/L; creatine=0.7-1.1 mg/dL; hypokalemia (potassium [K])=3.5-5mEq/L; hyponatremia (sodium [Na])=135-145 mEq/L; phosphorous=2.4-4.5 mg/dL; bilirubin=0-1.2. Grade (Gr) 1=Mild, Gr 2=Moderate, Gr 3=Severe, Gr 4=Life-threatening/disabling, Gr 5=Death.

AEs and SAEs considered possibly, probably, or certainly related to study treatment, graded according to CTCAE Version 3.0 (Grade 1=Mild, Grade 2=Moderate, Grade 3=Severe, Grade 4=Life-threatening or disabling, Grade 5=Death). SAE=any untoward medical occurrence that at any dose: results in death, is life-threatening, requires inpatient hospitalization or causes prolongation of existing hospitalization, results in persistent or significant disability/incapacity, is a congenital anomaly/birth defect, results in development of drug dependency or drug abuse, is an important medical event.

Notable drug-related AEs for dasatinib include gastrointestinal symptoms (diarrhea, nausea, vomiting and abdominal pain), fatigue, lethargy, headache, rash, fever, pleural effusion, and dyspnea.

Blood samples (3 mL) were used for measurement of dasatinib plasma concentration and metabolites.

Blood samples (3 mL) were used for measurement of dasatinib plasma concentration and metabolites.

Collagen Type IV is a circulating marker related to the modulation of the vascular endothelial growth factor (VEGF)-pathway. An assay of Collagen Type IV in plasma was performed by ELISA.

Collagen Type IV is a circulating marker related to the modulation of the vascular endothelial growth factor (VEGF)-pathway. An assay of Collagen Type IV in plasma was performed by ELISA.

VEGF-stimulated disruption of the cadherin-catenin complex leads to tumor cell invasion and metastasis. VEGFR2 plasma levels were assayed by ELISA as a marker of VEGF pathway modulation.

VEGF-stimulated disruption of the cadherin-catenin complex leads to tumor cell invasion and metastasis. VEGFR2 plasma levels were assayed by ELISA as a marker of VEGF pathway modulation.