1 Figuero-Pérez, MD, and Alejandro Olivares-Hernández, Department of Medical Oncology, University Hospital of Salamanca, and Institute for Research Cancer of Salamanca, Salamanca, Spain; Roberto A. Escala-Cornejo, MD, Institute for Research Cancer of Salamanca, Salamanca, and Department of Medical Oncology, Healthcare Complex of Ávila, Ávila, Spain; and Juan J. Cruz-Hernández, PhD, Department of Medical Oncology, University Hospital of Salamanca, Institute for Research Cancer of Salamanca, and University of Salamanca, Salamanca, Spain.