A pharmacokinetics phase 1 bioequivalence study of the trastuzumab biosimilar MYL-1401O vs. EU-trastuzumab and US-trastuzumab

Br J Clin Pharmacol. 2018 Oct;84(10):2336-2343. doi: 10.1111/bcp.13689. Epub 2018 Jul 31.


Aims: Trastuzumab is a humanized monoclonal antibody that binds the human epidermal growth factor receptor 2 (HER2) oncoprotein and is an effective therapy for HER2-overexpressing breast cancer. MYL-1401O is a trastuzumab biosimilar. Here, we report results from a phase 1 study that investigated bioequivalence among MYL-1401O, reference EU-trastuzumab and US-trastuzumab.

Methods: This single-centre, randomized, double-blind, three-arm, parallel-group, phase 1 study was conducted in healthy adult male volunteers. Subjects were randomized 1:1:1 to receive a single 8 mg kg-1 dose of MYL-1401O, EU-trastuzumab or US-trastuzumab as a 90-min intravenous infusion. The primary objective was to assess PK similarity among all three products. Primary endpoints assessed were peak serum concentration (Cmax), area under the serum concentration-time curve from time of dosing to time of last quantifiable concentration and from time of dosing to infinity. Secondary endpoints included time of Cmax, elimination rate constant, half-life, safety and immunogenicity.

Results: Of 132 subjects enrolled (44/treatment), 120 (MYL-1401O, n = 42; EU-trastuzumab, n = 41; US-trastuzumab, n = 37) were included in the PK analysis. The 90% confidence intervals of the ratios of geometric means for the primary endpoints were bounded within the predefined bioequivalence criterion of 80-125%. Secondary endpoints time of Cmax, elimination rate constant and half-life were similar among groups. All treatment-emergent adverse events were mild or moderate, similar across groups and no serious adverse events were reported. No treatment-related antidrug antibodies were detected.

Conclusions: MYL-1401O was well tolerated and demonstrated PK and safety profiles similar to EU-trastuzumab and US-trastuzumab in healthy volunteers (ClinicalTrials.gov, NCT02594761).

Keywords: bioequivalence; breast cancer; cancer; pharmacokinetics; phase 1.

Publication types

  • Clinical Trial, Phase I
  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Antineoplastic Agents, Immunological / administration & dosage
  • Antineoplastic Agents, Immunological / pharmacokinetics*
  • Area Under Curve
  • Biosimilar Pharmaceuticals / administration & dosage
  • Biosimilar Pharmaceuticals / pharmacokinetics*
  • Breast Neoplasms / drug therapy
  • Breast Neoplasms / pathology
  • Double-Blind Method
  • Drug Administration Schedule
  • Halfway Houses
  • Humans
  • Infusions, Intravenous
  • Male
  • Receptor, ErbB-2 / antagonists & inhibitors
  • Receptor, ErbB-2 / metabolism
  • Therapeutic Equivalency
  • Trastuzumab / administration & dosage
  • Trastuzumab / pharmacokinetics*
  • Young Adult


  • Antineoplastic Agents, Immunological
  • Biosimilar Pharmaceuticals
  • ERBB2 protein, human
  • Receptor, ErbB-2
  • Trastuzumab

Associated data

  • ClinicalTrials.gov/NCT02594761