title: Liposome-encapsulated doxorubicin compared with conventional doxorubicin in a randomized multicenter trial as first-line therapy of metastatic breast carcinoma.
abstract: BACKGROUND
  The objective of this study was to compare the efficacy and toxicity of the liposome-encapsulated doxorubicin, TLC D-99 (Myocet, Elan Pharmaceuticals, Princeton, NJ), and conventional doxorubicin in first-line treatment of metastatic breast carcinoma (MBC).
  
  
  METHODS
  Two hundred twenty-four patients with MBC and no prior therapy for metastatic disease were randomized to receive either TLC D-99 (75 mg/m(2)) or doxorubicin (75 mg/m(2)) every 3 weeks, in the absence of disease progression or unacceptable toxicity. The primary efficacy endpoint was response rate. Responses were assessed using World Health Organization criteria and were required to be of at least 6 weeks' duration. The primary safety endpoint was cardiotoxicity. Cardiac function was monitored by multiple-gated radionuclide cardioangiography scan, and the left ventricular ejection fraction (LVEF) was scored at a central laboratory. Patients were removed from study if LVEF declined 20 or more EF units from baseline to a final value of greater than or equal to 50%, or by 10 or more units to a final value of less than 50%, or onset of clinical congestive heart failure (CHF).
  
  
  RESULTS
  Median age was 54 years in both treatment groups. All relevant prognostic factors were balanced, with the exception that there were significantly more progesterone receptor positive patients in the doxorubicin-treated group. Protocol-defined cardiotoxicity was observed in 13% of TLC D-99 patients (including 2 cases of CHF) compared to 29% of doxorubicin patients (including 9 cases of CHF). Median cumulative doxorubicin dose at onset of cardiotoxicity was 785 mg/m(2) for TLC D-99 versus 570 mg/m(2) for doxorubicin (P = 0.0001; hazard ratio, 3.56). The overall response rate was 26% in both treatment groups. The median TTP was 2.9 months on TLC D-99 versus 3.1 months on doxorubicin. Median survival was 16 versus 20 months with a nonsignificant trend in favor of doxorubicin (P = 0.09). Clinical toxicities, commonly associated with doxorubicin, appeared less common with TLC D-99, although the difference was not statistically significant. There was only one report of palmar-plantar erythrodysesthesia (Grade 2) with this liposomal formulation of doxorubicin.
  
  
  CONCLUSIONS
  Single-agent TLC D-99 produces less cardiotoxicity than doxorubicin, while providing comparable antitumor activity.
authors.affiliation: Duke University Medical Center, Durham, North Carolina, USA. lyndsay_harris@dfci.harvard.edu
authors.forename: Lyndsay
authors.initials: L
authors.lastname: Harris
authors.forename: Gerald
authors.initials: G
authors.lastname: Batist
authors.forename: Robert
authors.initials: R
authors.lastname: Belt
authors.forename: Douglas
authors.initials: D
authors.lastname: Rovira
authors.forename: Rudolph
authors.initials: R
authors.lastname: Navari
authors.forename: Nozar
authors.initials: N
authors.lastname: Azarnia
authors.forename: Lauri
authors.initials: L
authors.lastname: Welles
authors.forename: Eric
authors.initials: E
authors.lastname: Winer
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000970:Antineoplastic Agents / Q000008:administration & dosage* / Q000009:adverse effects / Q000627:therapeutic use; D001943:Breast Neoplasms / Q000188:drug therapy* / Q000473:pathology; D004317:Doxorubicin / Q000008:administration & dosage* / Q000009:adverse effects / Q000627:therapeutic use; D004562:Electrocardiography; D005260:Female; D015637:Gated Blood-Pool Imaging; D006333:Heart Failure / Q000139:chemically induced; D006801:Humans; D008081:Liposomes; D008875:Middle Aged; D009362:Neoplasm Metastasis; D016016:Proportional Hazards Models; D012074:Remission Induction; D016019:Survival Analysis; D016277:Ventricular Function, Left
chemical_list: D000970:Antineoplastic Agents; D008081:Liposomes; D004317:Doxorubicin