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On hybrid parallel-crossover designs for assessing drug interchangeability of biosimilar products.

In recent years, a specific hybrid parallel-crossover design that consists of two sequences of treatments, namely R-R-R-R and R-T-R-T, where T and R is a proposed biosimilar product and an innovative biological product, respectively, have been proposed and received much attention for assessing drug interchangeability between T and R, where R could be either a US-licensed product or an EU-reference product. In practice, there are three types of hybrid parallel-crossover designs that are commonly employed in assessing drug interchangeability of biosimilar products. These three types of parallel-crossover hybrid designs include (1) a parallel + 2 × 2 crossover design, (2) a parallel + 2 × 3 crossover design, and (3) a parallel + 2 × 4 crossover design. This article provides a comprehensive review of these study designs including a complete N-of-1 randomized trial design. A specific hybrid parallel-crossover design, that is, (RRRR, RTRT) for addressing drug interchangeability in terms of switching and the relative risk between with/without alternation is discussed.

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