Title: Web-Based Microarray Data Analysis Using S+ArrayAnalyzer Author: Michael O~RConnell Insightful Corp Abstract: S+ArrayAnalyzer is a microarray data analysis software solution developed in collaboration with Bioconductor package developers and deployed with S-PLUS. The web version of the software uses the S-PLUS Server CONNECT/Java layer and tag libraries for direct access to the S-PLUS engine through JSP scripts. Analysis results are reported using S+Graphlets, lightweight web applets that include local drilldown and zoom, and simple connection to metadata on mouseover and click. The application features a simple web interface and configurations enabling (a) data assembly, preparation, statistical analysis (differential expression, class discovery/prediction) and reporting of microarray and supporting data, (b) statistical analysis and reporting of the genes and gene list data (e.g. gene set analysis, functional enrichment, druggable protein mapping, pathway analysis) resulting from the analysis of the microarray data, and (c) statistical analysis of clinical and discovery data combinations for identification of genes associated with clinical response. The presentation will describe the software design and deployment using examples of workflows from commercial implementations of the software.