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Oncolytic measles virus (MV) encoding the human thyroidal sodium iodide symporter (MV-NIS) has proved to be safe after intraperitoneal or intravenous administration in patients with ovarian cancer or multiple myeloma, respectively, but it has not yet been administered through intratumoral injection in humans. Squamous cell carcinoma (SCC) of the head and neck (SCCHN) usually is locally invasive and spreads to the cervical lymph nodes, which are suitable for the intratumoral administration of oncolytic viruses. To test whether oncolytic MV is an effective treatment for SCCHN, we used oncolytic MV-NIS to infect SCCHN in vitro and in vivo. The data show that SCCHN cells were infected and killed by MV-NIS in vitro. Permissiveness of the tumor cells to MV infection was not affected by irradiation after viral addition. Monitored noninvasively through radioiodine-based single-photon emission computed tomography/computed tomography, intratumorally virus-delivered NIS has concentrated the radioiodine in the MV-NIS-treated tumors in the FaDu mouse xenograft model of human SCCHN, and the antitumor effect could be boosted significantly (p&lt;0.05) either with concomitant cyclophosphamide therapy or with appropriately timed administration of radioiodine (131)I. MV-NIS could be a promising new anticancer agent that may substantially enhance the outcomes of standard therapy after intratumoral administration in patients with locally advanced SCCHN.

Oncolytic Measles Virus Encoding Thyroidal Sodium Iodide Symporter for Squamous Cell Cancer of the Head and Neck Radiovirotherapy