title: Using general regression and probabilistic neural networks to predict human intestinal absorption with topological descriptors derived from two-dimensional chemical structures.
abstract: The objective of this study was to develop rapid and reliable methods to predict the percent human intestinal absorption (%HIA) of compounds based on their 2D descriptors. The analyzed data set included 86 drug and drug-like molecules and was the same as that studied by Wessel and co-workers. Instead of using three-dimensional descriptors such as polar surface area, which require lengthy computations, we employed only two-dimensional topological descriptors derived from information about the two-dimensional structure of molecules. The %HIA values were modeled using a general regression neural network (GRNN) and a probabilistic neural network (PNN), variants of normalized radial basis function networks. Both networks performed well to model the %HIA values. The root-mean square (rms) error was 22.8 %HIA unit for the external prediction set for a GRNN model, and 80% of the external prediction set was correctly classified for a PNN model, indicating the potential of our approach to estimate the %HIA values for a large set of compounds as virtual libraries.
authors.affiliation: Discovery Research Laboratory, Nippon Shinyaku Co., Ltd., 14, Nishinosho-Monguchi-cho, Kisshoin, Minami-ku Kyoto, 601-8550 Japan. tniwa@po.nippon-shinyaku.co.jp
authors.forename: Tomoko
authors.initials: T
authors.lastname: Niwa
mesh_terms: D006801:Humans; D007408:Intestinal Absorption; D008954:Models, Biological; D015233:Models, Statistical; D015394:Molecular Structure; D016571:Neural Networks, Computer; D004364:Pharmaceutical Preparations / Q000737:chemistry; D010599:Pharmacokinetics; D012044:Regression Analysis
chemical_list: D004364:Pharmaceutical Preparations