Conditions: Cancer
Keywords: carcinoma, breast lump, Pagets disease, breast cancer positive for human epidermal growth factor receptor 2, breast cancer progression, estrogen-receptor
Allocation: RANDOMIZED | Intervention model: 
Enrollment: 37
Healthy volunteers: no

Brief summary:
This was a randomized, open-label, multi-center Phase III study evaluating the efficacy and safety of lapatinib in combination with trastuzumab versus trastuzumab alone as continued HER2 suppression therapy in women with HER2-positive metastatic breast cancer (MBC). Eligible subjects should have completed 12 to 24 weeks of first- or second-line treatment with trastuzumab plus chemotherapy, experienced either complete disappearance of all metastatic lesions, or persistence of metastatic disease (stable disease) without unequivocal progression or the occurrence of new lesions, and been indicated to continue to receive trastuzumab alone as maintenance therapy. Eligible subjects who entered the LPT112515 study on first-line treatment should not have known history of central nervous system (CNS) metastases; subjects who entered the study on second-line treatment should not have known history of CNS metastases or have stable (asymptomatic and off steroids ≥3 months) CNS metastases. The primary objective of this study was to compare progression-free survival (PFS) in subjects with HER2-positive MBC randomized to receive treatment with lapatinib plus trastuzumab versus those randomized to receive trastuzumab alone. The secondary objectives included overall survival, clinical benefit response rate (CR, PR or SD ≥24 weeks) and the qualitative and quantitative adverse event profile of the 2 treatment arms. It was estimated that 280 subjects (140 per group) would be required to observe 193 PFS events.

Detailed description:

Arms:
arm 1: None arm 2: None

Interventions: intervention 1: Lapatinib intervention 2: Trastuzumab
Intervention descriptions: intervention 1: Oral Lapatinib 1000 mg once daily. Lapatinib was a small molecule, reversible inhibitor targeting HER2 tyrosine kinase receptor. intervention 2: IV Trastuzumab 6 mg/kg every three weeks. Trastuzumab was a humanized, monoclonal antibody directed against the extracellular domain of the HER2 tyrosine kinase receptor.

Protocol document: