For the first time, both methods were compared at a technical and performance level for the collection of large molecules in rodents. They found 10-fold higher absolute concentrations in cOFM samples compared to MD. In vivo recovery revealed an increased extraction of trastuzumab at low flow rates and a 6-fold higher absolute concentration at steady state than initially calculated with the in vitro recovery.
The authors conclude that the “standardization of these complex methods makes the unraveling of ISF concentrations attainable for various diseases and modalities, starting in this study with mAbs, but extending further in the future to RNA therapeutics, antibody-drug conjugates, and even cell therapies.”