MORRISVILLE, N.C.--(BUSINESS WIRE)--Clinipace Worldwide, a global digital clinical research organization (dCRO), announced today that Plexxikon Inc., a leader in the structure-guided discovery and development of novel small molecule pharmaceuticals to treat human disease, has selected Clinipace to manage all aspects of four clinical trials comprising a Phase 1 healthy volunteer study, a Phase 1b rheumatoid arthritis (RA) study, and two phase 2 oncology studies.