This Phase II study will assess the efficacy, safety, and pharmacodynamics and pharmacokinetics of 1000 mg and 1500 mg lapatinib administered once daily in patients with relapsed adenocarcinoma of the esophagus, including tumors of the GE junction and gastric cardia.
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Objective response rate (ORR) of treatment with daily lapatinib at two different doses (1000 mg and 1500 mg per day)
Timeframe: daily throughout the study