A Phase II, Open-Label Study Evaluating Clinical Efficacy, Safety, Pharmacokinetic and Pharmacodynamic Effects of Lapatinib (GW572016) in Patients With Relapsed Adenocarcinoma of the Esophagus, Including Tumors of the Gastroesophageal Junction and Gastric Cardia

Inclusion Criteria

Inclusion criteria:

- Has a histologically confirmed adenocarcinoma of the esophagus.

- GE (gastroesophageal) junction or gastric cardia.

- Must be of non-child-bearing potential or is of child-bearing potential.

- Have a negative serum pregnancy test and agree to an approved form of birth control.

- Have an ECOG (Eastern Cooperative Oncology Group) Performance status less than or
equal to 2.

- Have a life expectancy of at least 12 weeks.

- Have provided written informed consent.

- Investigator considers patient to be fit for study from lab test results and
interview.

Exclusion criteria:

- Pregnant or lactating female.

- Prior resection of the small bowel.

- Received major surgery.

- Received prior radiation therapy to the mediastinum or abdomen.

- Has a known immediate or delayed hypersensitivity reaction.

- Idiosyncrasy to drugs chemically related to the study drug.