Tumoricidal effect of human PBMC following stimulation with OK-432 and its application for locoregional immunotherapy in head and neck cancer patientsKubota, E.; Katano, M.; Kurokawa, H.; Imamura, H.; Katsuki, T.; Yamamoto, H.; Hisatsugu, T.; Nagumo, F.; Tadano, J. · 1993