title: Treatment of older patients with HER2-positive metastatic breast cancer with pertuzumab, trastuzumab, and docetaxel: subgroup analyses from a randomized, double-blind, placebo-controlled phase III trial (CLEOPATRA).
abstract: Although the incidence of cancer increases with age, older patients are under-represented in cancer treatment trials, resulting in limited data availability in this patient population. Here we present results from pre-defined subgroup analyses conducted by age group (<65 vs ≥ 65 years) from a randomized, double-blind, placebo-controlled phase III trial in patients with HER2-positive metastatic breast cancer. Patients who had not received previous chemotherapy or biological therapy for HER2-positive locally recurrent, unresectable or metastatic breast cancer were randomly assigned to treatment with placebo, trastuzumab, and docetaxel or with pertuzumab, trastuzumab, and docetaxel. Primary endpoint was independently assessed progression-free survival. We performed pre-specified subgroup analyses of progression-free survival according to age. The study is registered with ClinicalTrials.gov, NCT00567190. 808 patients were enrolled. Of those, 127 patients were 65 years of age or older (placebo arm: 67, pertuzumab arm: 60). Patients in both age groups experienced progression-free survival benefit with treatment in the pertuzumab arm (<65 years: HR: 0.65; 95 % CI 0.53-0.80; ≥65 years: HR: 0.52; 95 % CI 0.31-0.86). Diarrhoea, fatigue, asthenia, decreased appetite, vomiting, and dysgeusia were reported more frequently in patients 65 years of age or older compared with younger patients. Neutropenia and febrile neutropenia were reported less frequently in the older age group. The efficacy and safety data reported in CLEOPATRA suggest that the combined use of pertuzumab, trastuzumab, and docetaxel should not be limited by patient age.
authors.affiliation: Mount Vernon Cancer Centre, Rickmansworth Road, Northwood, Middlesex, HA6 2RN, UK, david.miles@doctors.org.uk.
authors.forename: David
authors.initials: D
authors.lastname: Miles
authors.forename: José
authors.initials: J
authors.lastname: Baselga
authors.forename: Dino
authors.initials: D
authors.lastname: Amadori
authors.forename: Patrapim
authors.initials: P
authors.lastname: Sunpaweravong
authors.forename: Vladimir
authors.initials: V
authors.lastname: Semiglazov
authors.forename: Adam
authors.initials: A
authors.lastname: Knott
authors.forename: Emma
authors.initials: E
authors.lastname: Clark
authors.forename: Graham
authors.initials: G
authors.lastname: Ross
authors.forename: Sandra M
authors.initials: SM
authors.lastname: Swain
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D061067:Antibodies, Monoclonal, Humanized / Q000008:administration & dosage; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000009:adverse effects / Q000627:therapeutic use*; D001943:Breast Neoplasms / Q000188:drug therapy* / Q000378:metabolism / Q000401:mortality / Q000473:pathology*; D000077143:Docetaxel; D005260:Female; D006801:Humans; D008875:Middle Aged; D009362:Neoplasm Metastasis; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000378:metabolism; D043823:Taxoids / Q000008:administration & dosage; D000068878:Trastuzumab; D016896:Treatment Outcome
chemical_list: D061067:Antibodies, Monoclonal, Humanized; D000077143:Docetaxel; D018719:Erb-b2 Receptor Tyrosine Kinases; D043823:Taxoids; D000068878:Trastuzumab; C485206:pertuzumab