Greenwich Lifesciences Inc. followed a February update with another on the phase III Flamingo-01 trial, providing open-label immune response data for GLSI-100, a HER2/neu peptide vaccine immunotherapy to prevent breast cancer recurrences in patients who have completed standard therapy. Specifically, GLSI-100 combines GP2, the HER2/neu-derived peptide, with granulocyte-macrophage colony-stimulating factor.