Lyrid LLC 1 article published in JoVE Cancer Research Analyzing Tumor Gene Expression Factors with the CorExplorer Web Portal Shirley Pepke1, William M. Nelson2, Greg Ver Steeg3 1Lyrid LLC, 2Independent consultant, 3Information Sciences Institute, University of Southern California We introduce the CorExplorer web portal, an resource for exploration of tumor RNA sequencing factors found by the machine learning algorithm CorEx (Correlation Explanation), and show how factors can be analyzed relative to survival, database annotations, protein-protein interactions, and one another to gain insight into tumor biology and therapeutic interventions.