To qualify for the trial, subjects must have histologically confirmed, incurable, locally advanced or metastatic breast cancer that is ER-negative, PR-negative, Her2/neu-negative and EGFR-positive. Subjects must have measurable disease. They must have received less than or equal to 1 chemotherapeutic agent in the metastatic setting. The target accrual is 43 subjects. Initially, 18 subjects will be accrued. If at least 3 subjects are progression-free at 4 months, accrual will continue to a maximum of 43 subjects. Subject eligibility will be evaluated during a screening period of 4 weeks. During the treatment period, subjects will receive single agent erlotinib, 150mg/day. Subjects will receive the first dose of erlotinib on Day 0, within 7 days of registration. Efficacy will be assessed by radiographic tumor assessment or photographic documentation. Safety will be assessed by the recording of adverse events and laboratory test results. Subjects with documented progressive disease will be discontinued from treatment and will be followed for survival information every 2 months until death, lost to follow-up or study termination.