Title:A Novel Electrochemiluminescence (ECL) Immunoassay for the Quantitation
of Monoclonal Antibody (mAb) PYX-106 in Human Serum
Volume: 20
Issue: 6
Author(s): Feng Yin*, Diana Adhikari, Xiaodong F. Liu, Jianxin Wang, Wensheng Yang, Gabriela A. Balogh, Teri Simon, Wenji Lei, Mariana Squicciarini, Lisa Bruce, Yan Ke, Mike Dyszel, Shawn Harriman*Jan Pinkas*
Affiliation:
- Department of Nonclinical Research, Pyxis Oncology, Inc., Boston, USA
- Department of Nonclinical Research, Pyxis Oncology, Inc., Boston, USA
- Department of Nonclinical Research, Pyxis Oncology, Inc., Boston, USA
Keywords:
mAb, PYX-106, siglec-15, oncology, ECL, MSD.
Abstract:
Background: PYX-106 is a novel monoclonal antibody (mAb), targeting the sialic acidbinding
immunoglobulin-like lectin 15 (Siglec-15) in the Tumor Microenvironment (TME). Precise
measurement of PYX-106 is essential for the thorough assessment of PYX-106 pharmacokinetics
in clinical investigations.
Methods: A novel Electrochemiluminescence (ECL) immunoassay for the quantitation of PYX-
106 in human serum was developed and validated. Biotinylated anti-PYX-106 antibody Bio-A1A1
was employed as the capture antibody, and ruthenylated anti-PYX-106 antibody Ru-A3G10 was
utilized as the detection antibody in the ECL immunoassay on Meso Scale Discovery (MSD) platform.
Results: This assay was fully validated in terms of selectivity, accuracy, precision, hook effect,
stability, etc., with a dynamic range from 50.0 to 2,500 ng/mL in human serum under the 2018
U.S. Food and Drug Administration (FDA) guidance and the 2022 U.S. FDA ICH M10 guidance.
Conclusion: PYX-106 bioanalytical assay validation was reported for the first time in a biological
matrix, and this assay has been successfully applied to support a clinical trial PYX-106-101.