<qa>  What is the name of the immunospot analysis used to assess response?Patients undergo blood and tumor tissue sample collection periodically for laboratory studies. Blood samples are analyzed using MHC tetramer analysis; enzyme-linked immunospot ELISPOT analysis; EBV DNA titers to assess response; and flow cytometry to assess lymphocyte kinetics. Tumor tissue samples are used for immunological studies. Delayed-type hypersensitivity is also assessed. 