longer whichever lives half preceding investigational drug days dose study 
investigational whichever half longer lives product agent prior days study 
half lives agents investigational prior days treatment therapy study drug 
taken half investigational lives days shorter whichever agents minimum drug 
immunostimulatory whichever lives half agents systemic shorter treatment drug weeks 
shorter whichever half lives therapy weeks prior investigational chemotherapy treatment 
shorter half lives whichever days investigational dose drug study minimum 
whichever longer half lives drug investigational study days dose weeks 
antibody monoclonal lives half elapsed dose prior antibodies treatment days