Immunotherapy with effector cells and IL-2 of lymph node metastases of human squamous-cell carcinoma of the head and neck established in nude mice

We have previously reported that immune anti-tumor effector cells, both cyt otoxic T lymphocytes (CTLs) and IL-2-activated natural killer (A-NK) cells, are effective at eliminating human head-and-neck cancer (HNC) targets in v itro and in vivo in xenograft models, In this study, these 2 types of human effector cell were compared for the ability to prevent the development of lymph node metastases in a metastasis model of human squamous-cell carcinom a of the head and neck (SCCHN) established in nude mice, A tumor cell line, OSC-19, was injected into the floor of the mouth in nude mice, and the tum or grew progressively and metastasized to cervical lymph nodes by day 21. A s effector cells, a human HLA-AZ-restricted CTL line recognizing a shared a ntigen on OSC-19 and human non-MHC-restricted A-NK cells were used. Both ty pes of effector cell mediated high levels of lysis against OSC-19 targets i n 4-hr Cr-51-release assays. Administration of human CTLs or A-NK cells and IL-2 to the site of tumor growth in mice with 7-day OSC-19 tumors resulted in significant reduction of the number of lymph node metastases relative t o untreated or sham-operated controls or to mice treated with IL-2 without the effector cells. Our results suggest that in a xenograft model of human SCCHN implanted in the oval cavity of nude mice, the development of lymph n ode metastases can be successfully controlled by adoptive transfer of human SCCHN-specific CTLs or SCCHN-reactive A-NK cells plus IL-2. (C) 1999 Wiley -Liss, Inc.