Myriad Genetics, Inc. has expanded its commercial and clinical capabilities with several appointments. The company named Robert Rubens, M.D., vice president of medical affairs, and James DeMarco as vice president of sales for Myriad Pharmaceuticals, Inc. Margaret Yu, M.D., has been named director of clinical research in oncology and Andrew Beelen, M.D., as senior director of clinical research in infectious diseases.     Dr. Rubens will oversee education, publications, Phase IV studies, the CN...