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Brief Title: Study Comparing Lapatinib (GW572016) And Letrozole Versus Letrozole In Subjects With Advanced Or Metastatic Breast Cancer
Official Title: A Randomized, Double-Blind, Placebo-Controlled, Multicenter Phase III Study Comparing GW572016 and Letrozole Versus Letrozole in Subjects With Estrogen/Progesterone Receptor- Positive Advanced or Metastatic Breast Cancer
Study ID: NCT00073528
Brief Summary: This study evaluated and compared the efficacy and tolerability of lapatinib and letrozole, with letrozole and placebo in post-menopausal women with hormone receptor positive (ER positive and/or PgR positive) advanced or metastatic breast cancer, who had not received prior therapy for advanced or metastatic disease.
Detailed Description: Subjects were randomly assigned to receive either lapatinib (1500 mg once daily orally) with letrozole (2.5 mg once daily orally), or letrozole (2.5 mg once daily orally) with placebo (which matched with lapatinib tablet). Randomization was stratified by site of disease (i.e., soft tissue/visceral disease versus bone only disease) and time since prior adjuvant endocrine therapy (\<6 months or ≥ 6 months from discontinuation of adjuvant anti-estrogen therapy (e.g. tamoxifen or raloxifene) or no prior adjuvant antiestrogen therapy). Study therapy was administered daily until disease progression (objective or symptomatic) or withdrawal from therapy (e.g., due to unacceptable toxicity, withdrawal of consent, or other reason). All subjects were to be followed for survival information until death. On 13 Apr 2015, after the introduction of the Long Term Follow UP (LTFU) phase (per protocol amendment 07), subjects receiving study treatment with lapatinib plus letrozole, or letrozole plus placebo had continued access to this study treatment until the occurrence of one of the following criteria: * Disease progression (as determined by the Investigator), * Intercurrent illness that prevented further administration of study treatment * Drug related AE which was considered by the investigator to warrant permanent discontinuation of study treatment * The subject decided to withdraw from the study. Investigators collected AEs and/or SAEs related to study participation, until 30 days following study treatment discontinuation. Subjects who were being followed-up for OS but were not taking study medication, were withdrawn from the study. The study was terminated on 22-Mar-2018 (last subject last visit).
Minimum Age: 18 Years
Eligible Ages: ADULT, OLDER_ADULT
Sex: FEMALE
Healthy Volunteers: No
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Name: Novartis Pharmaceuticals
Affiliation: Novartis Pharmaceuticals
Role: STUDY_DIRECTOR