title: Use of trastuzumab beyond disease progression: observations from a retrospective review of case histories.
abstract: HER2 overexpression is associated with poor breast cancer prognosis and is the target for the humanized monoclonal antibody trastuzumab. This novel agent, when administered until disease progression in combination with chemotherapy, extends the survival of women with HER2-positive metastatic breast cancer (MBC). However, the optimal duration of trastuzumab therapy remains to be confirmed. We conducted a retrospective case review study of women with HER2-positive MBC who continued to receive trastuzumab beyond disease progression. Objectives were to assess whether treatment beyond disease progression shows any evidence of efficacy and to evaluate the feasibility of this approach. One hundred five patients (median age, 47 years; range, 24-77 years) were identified in 13 centers. Women had received </=6 chemotherapy regimens (median, 1) before trastuzumab therapy. Median survival from first trastuzumab dose was 29 months. The overall response rate to trastuzumab alone or with a taxane as the first regimen was 39%; a further 30% of patients had stable disease as the best response. These rates were 36% and 38% after a second regimen of trastuzumab alone or with paclitaxel or vinorelbine was administered. Some patients responded to both the first and second regimens; others responded to the second regimen after the first had failed. Twenty-two patients experienced cardiac events, of whom 18 received >/=1 more trastuzumab regimen. Trastuzumab treatment beyond progression appears to be of value, producing responses and clinical benefit, and is well tolerated without significant cardiac toxicity. The feasibility of this approach warrants examination in prospective trials.
authors.affiliation: British Columbia Cancer Agency, Vancouver, Canada. kgelmon@bccancer.bc.ca
authors.forename: Karen A
authors.initials: KA
authors.lastname: Gelmon
authors.forename: John
authors.initials: J
authors.lastname: Mackey
authors.forename: Shailendra
authors.initials: S
authors.lastname: Verma
authors.forename: Stan Z
authors.initials: SZ
authors.lastname: Gertler
authors.forename: Nicholas
authors.initials: N
authors.lastname: Bangemann
authors.forename: Paul
authors.initials: P
authors.lastname: Klimo
authors.forename: Andreas
authors.initials: A
authors.lastname: Schneeweiss
authors.forename: Karl
authors.initials: K
authors.lastname: Bremer
authors.forename: Denis
authors.initials: D
authors.lastname: Soulieres
authors.forename: Katia
authors.initials: K
authors.lastname: Tonkin
authors.forename: Richard
authors.initials: R
authors.lastname: Bell
authors.forename: Bernhard
authors.initials: B
authors.lastname: Heinrich
authors.forename: Debjani
authors.initials: D
authors.lastname: Grenier
authors.forename: Reg
authors.initials: R
authors.lastname: Dias
mesh_terms: D000328:Adult; D000368:Aged; D000911:Antibodies, Monoclonal / Q000009:adverse effects / Q000627:therapeutic use*; D061067:Antibodies, Monoclonal, Humanized; D000970:Antineoplastic Agents / Q000009:adverse effects / Q000627:therapeutic use*; D001943:Breast Neoplasms / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D018450:Disease Progression; D005260:Female; D006801:Humans; D008875:Middle Aged; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000378:metabolism; D012189:Retrospective Studies; D013997:Time Factors; D000068878:Trastuzumab; D016896:Treatment Outcome
chemical_list: D000911:Antibodies, Monoclonal; D061067:Antibodies, Monoclonal, Humanized; D000970:Antineoplastic Agents; D018719:Erb-b2 Receptor Tyrosine Kinases; D000068878:Trastuzumab