Panobinostat intravenously (i.v.) or orally was given in combination with trastuzumab.

Participants received escalating doses of panobinostat until the maximum tolerated dose (MTD) was reached. The starting dose of panobinostat i.v. was 10mg/m^2 at days 1 and 8 during a 21-day treatment cycle. The oral panobinostat starting dose was 20 mg twice weekly.

Safety data was reviewed to determine the DLTs. DLTs comprised adverse events (AEs) or abnormal laboratory values that occurred at any time and were assessed as clinically relevant and meeting any of the following criteria: considered to be related to the study treatment and unrelated to disease, disease progression, inter-current illness, or concomitant medications. Toxicities were assessed using the National Cancer Institute common terminology criteria for adverse events (NCI CTCAE), version 3.0. Disease related symptoms were not considered a DLT.

Tumors were assessed according to Response Evaluation Criteria in Solid tumors (RECIST). Complete response (CR): disappearance of all lesions (i.e. all evidence of disease, not just the target lesions) determined by 2 observations not less than 4 weeks apart; Partial response (PR): > 30% decrease in the sum of longest diameters of target lesions compared to baseline, with response or stable disease observed in non-target lesions, and no new lesions; Stable disease (SD): neither sufficient shrinkage to qualify for response or sufficient increase to qualify for progressive disease in target lesions, with response or stable disease observed in non-target lesions, and no new lesions; Progressive disease (PD): > 20% increase in the sum of longest diameters of target lesions compared to smallest sum longest diameter recorded. In addition, the sum must also demonstrate an absolute increase of at least 5mm.