Skip to content

Microdosing of a Carbon-14 Labeled Protein in Healthy Volunteers Accurately Predicts Its Pharmacokinetics at Therapeutic Dosages.

Maria L H Vlaming, Esther van Duijn, M R Dillingh, R Brands, A D Windhorst, N H Hendrikse, Sieto Bosgra, J Burggraaf, M C De Koning, A Fidder, J A J Mocking, H Sandman, R A F De Ligt, B O Fabriek, W J Pasman, W Seinen, T Alves, M Carrondo, C Peixoto, P A M Peeters, Wouter Vaes

Clinical Pharmacology & Therapeutics August 2015 DOI: 10.1002/cpt.131 (opens in new tab)

Study at a glance

AI-extracted from the abstract
Characteristics Phase 0/phase 1 first-in-human trial Peer reviewed
Population Healthy volunteers
Dose microdose 53 μg [14C]-hRESCAP; therapeutic doses up to 5.3 mg
Topics Microdosing
Key findings Pharmacokinetic analysis showed dose linearity from a microdose of 53 μg [14C]-hRESCAP to therapeutic doses up to 5.3 mg in healthy volunteers. The authors argue that microdosing with ultrasensitive accelerator mass spectrometry in a very small cohort can provide human pharmacokinetic data early and accelerate clinical development of new biological entities.

Abstract

Preclinical development of new biological entities (NBEs), such as human protein therapeutics, requires considerable expenditure of time and costs. Poor prediction of pharmacokinetics in humans further reduces net efficiency. In this study, we show for the first time that pharmacokinetic data of NBEs in humans can be successfully obtained early in the drug development process by the use of microdosing in a small group of healthy subjects combined with ultrasensitive accelerator mass spectrometry (AMS). After only minimal preclinical testing, we performed a first-in-human phase 0/phase 1 trial with a human recombinant therapeutic protein (RESCuing Alkaline Phosphatase, human recombinant placental alkaline phosphatase [hRESCAP]) to assess its safety and kinetics. Pharmacokinetic analysis showed dose linearity from microdose (53 μg) [(14) C]-hRESCAP to therapeutic doses (up to 5.3 mg) of the protein in healthy volunteers. This study demonstrates the value of a microdosing approach in a very small cohort for accelerating the clinical development of NBEs.

Comparable studies

Other non-randomized and open-label trials on microdosing, most cited first.

Study Year Design Participants
An open-label pilot trial assessing tolerability and feasibility of LSD microdosing in patients with major depressive disorder (LSDDEP1). Patients with major depressive disorder meeting DSM-5 criteria 2023 Open-label pilot trial n = 20
LSD microdosing in major depressive disorder: results from an open-label trial Participants with major depressive disorder, most taking antidepressant medication 2025 Open-label phase 2A trial n = 19
Evaluating the Potential of Microdosing 1cp-LSD for the Treatment of Canine Anxiety: A One-Month Case Study. A 13-year-old female dog with severe separation anxiety 2025 Pilot study, single-case study n = 1
LSD microdosing for major depressive disorder: Mood and pharmacokinetic outcomes from a Phase 2a trial People with depression 2026 Clinical trial
Evaluation of different mineral fertilizer microdosing options to optimize the productivity of Pearl millet hybrids (Pennisetum glaucum (L.) R. Br.) in the central groundnut basin of Senegal Millet (Pennisetum glaucum) hybrids and variety Taaw grown in the groundnut-growing... 2026 Split-plot field trial

Citations in the library

Explore topics