Safety and Efficacy of Intra-Arterial and Intra-Tumoral Ad-p53 With Capecitabine (Xeloda) or Anti-PD-1 in Liver Metastases of Solid Tumors and Recurrent Head and Neck Squamous Cell Cancer

This is a Phase 1/2 study of the combination of Ad-p53 administered intra-arterially in combination with oral metronomic capecitabine or pembrolizumab in patients with unresectable, refractory liver metastases of colorectal carcinoma (CRC) and other solid tumors, including primary hepatocellular carcinoma (HCC). A third arm will study the intra-tumoral injection of Ad-p53 combined with nivolumab infusions in recurrent head and neck squamous cell cancer (HNSCC). This safety study has a standard 3+3 design for arms A and B; .HNSCC will be placed in a single dosing cohort. The Maximum Tolerated Dose (MTD) will be determined as well for intra-arterial infusions, and the entire study will determine the general efficacy using RECIST 1.1 and Immune-Related Response Criteria. Safety will be followed using the CTCAE listings for adverse events.