Lapatinib is given at escalating doses orally and continuously on days 1-21. Caelyx is administered at escalating doses in a 60-minute i.v. infusion on day 1. Each cycle is defined as 21 days. Four dose levels are planned. Dose level -1, Caelyx 30 mg/mq & Lapatinib 1000 mg die; dose level 1, Caelyx 30 mg/mq & Lapatinib 1250 mg die; dose level 2, Caelyx 30 mg/mq & Lapatinib 1500 mg die; dose level 3, Caelyx 40 mg/mq & Lapatinib 1500 mg die. Three patients will be initially enrolled in each dose level starting from level 1. If none of the first triplet of patients will develop DLT, the dose will be escalated to the next level for the subsequent three patients. If one of the first triplets of patients will develop first-course DLT, a maximum of 3 additional patients will be entered at the same dose level. The MTD is defined as the dose below that at which two patients have experienced DLT. Lapatinib will be self-administered by the patient in an outpatient setting at the dose of the assigned step. Patients will take the drug daily by mouth on days 1 to 21 of each cycle. Caelyx will be administered by intravenous infusion over an exact period of 1 hour (preferably by a pump to guarantee a constant speed of infusion) on day