HD201: Analytical biocomparability and clinical trial progression of trastuzumab.

Abstract

e12505 Background: Trastuzumab, an approved prescription drug by EMA and FDA under the name Herceptin has become the key treatment in patients with HER2 positive breast cancer. HD201, developed and owned by Prestige Biopharma Pte Ltd is a biosimilar product to Herceptin (Trastuzumab). The development of HD201 from analytical biocomparability to clinical trial progression are demonstrated. Methods: Analytical biocomparability in terms of physicochemical (primary, higher order structure, glycan profiles, molecular and charge variants) and biological properties (inclusive of binding to Fcγ receptors and neonatal receptor) between HD201 and EU and US-Herceptin were compared. The first human study of HD201 (clinical phase I) was designed to assess the pharmacokinetic (PK) equivalence between HD201 and EU-Herceptin. In this randomised, blinded, single-dose comparative PK study, randomised healthy human subjects were subjected to a single 6 mg/kg IV dose of HD201 and EU-Herceptin following by PK and safety evaluations. Following this, a randomised, double-blind, parallel group, equivalence, multicentre clinical phase III trial (TROIKA) was designed to compare the efficacy, safety, and pharmacokinetics of HD201 to EU-Herceptin in 500 patients with HER2+ early breast cancer. Each group of patients (250 patients) were administered with either HD201 or EU-Herceptin once every 3 weeks up to 8 cycles in combination of a neoadjuvant chemotherapy comprising of docetazel followed by an anthracycline-containing regimen. Results: HD201 shows equivalent in physicochemical and biological properties compared to EU- and US-Herceptin. Clinical phase I study demonstrated that HD201 is safe and well tolerated with comparable PK profiles as EU-Herceptin after single dose administration to healthy male adults (Pivot et al., 2018). Analysis of sub study from clinical phase III has demonstrated comparable results with EU- Herceptin in terms of patient demographic, clinical response, safety and pharmacokinetic profile. Conclusions: HD201 is demonstrated to be equivalent in analytical biocomparability and in clinical response, safety and PK profile to Herceptin in human study. Additional data for Pharmacokinetic from Troika trial will be reported in Asco meeting. Clinical trial information: 2012-000805-56.