A Study to Evaluate Safety and Efficacy of Caelyx in Combination With Cyclophosphamide in the Treatment of Metastatic Breast Cancer (P02948)

Inclusion Criteria:

* Female, aged \>=18 years.
* Subject must have histologic diagnosis of breast carcinoma.
* Subject must have documented measurable metastatic breast cancer by appropriate radiologic imaging.
* Subject must have previous anthracyclin-based adjuvant regimen and disease-free status for at least one year following the completion of adjuvant therapy.
* Subject must have ECOG performance status 0, 1, or 2.
* Subject must have life expectancy \> 6 months
* Subject must have left ventricular ejection fraction \>=55% as determined by MUGA scan.
* Subject must have normal organ function, except if abnormal due to tumor involvement:

  * Adequate bone marrow function (platelets \>=100 X 10\^9/L, hemoglobin \>=90 g/L, Neutrophils \>=1.5 X 10\^9/L)
  * Adequate renal function (serum creatinine \< 2 X the upper limit of normal (ULN)
  * Adequate liver function (bilirubin \< 2 times ULN, AST or ALT \< 2 times ULN in the absence of liver metastasis, AST or ALT \< 5 times ULN in the presence of liver metastasis.
* Women of childbearing potential must be using adequate contraception and have a negative pregnancy test at the time of enrollment.
* Subject must be able to understand and give informed consent.

Exclusion Criteria:

* Age \> 75 years old.
* Subject who is pregnant or breastfeeding or is unwilling to use adequate contraception.
* Subject who has had a previous chemotherapy for metastatic disease.
* Subject who has history of cardiac disease, with New York Heart Association Class II or greater with congestive heart failure.
* Subject who has clinically significant hepatic disease in regard to Hepatitis B, Hepatitis C, cirrhosis, or other liver diseases unrelated to the underlying metastatic breast cancer.
* Subject who has uncontrolled bacterial, viral, or fungal infection.
* Subject who exhibits confusion or disorientation.
* Subject with any condition which would prevent adequate follow-up.
* Subject who has received radiotherapy in the last 4 weeks.
* Subject with any other active primary tumor under treatment, except basal cell carcinoma of the skin, or carcinoma in situ of the cervix.
* Subject who has brain metastasis.
* Subject who is not able to give informed consent.