Protein named entity classification with probabilistic features derived from GENIA corpus and MEDLINE

摘要

Biome?dical named entity recognition (BNER) is one of the most essential and initial tasks (discovering relations between biome?dical entities, identifying molecular pathways, etc.) of biome?dical information retrieval. Although named entity recognition performed well in ordinary text, it still remains challenging in molecular biology domain because of the complex nature of biome?dical nomenclature, different kinds of spelling forms and many more reasons. Even though biome?dical entities in biological text are found successfully, classifying them into relevant biome?dical classes such as genes, proteins, diseases, drug names, etc. is still another challenge and an open question. This paper presents a new method to classify biome?dical named entities into protein and non-protein classes. Our approach employs Random Forest, a machine learning algorithm, with a new combination of features. They are orthographic, keyword and morphological, as well as a probabilistic feature called Proteinhood and a Protein-Score feature based on the Medline abstracts cited on the Pubmed, which are the main contributions in the paper. A series of experiments is conducted to compare the proposed approach with other state of the art approaches. Our protein named entity classifier shows significant performance in the experiments on GENIA corpus achieving the highest values of precision 93.8%, recall 83.8% and F-measure 88.5% for protein named entity identification. In this study we showed the effect of new Proteinhood and Protein-Score features as well as adjusting parameters of Random Forest algorithm.