A Study of CF33-hNIS (VAXINIA), an Oncolytic Virus, as Monotherapy or in Combination With Pembrolizumab in Adults With Metastatic or Advanced Solid Tumors

Inclusion Criteria: * Written informed consent from patient or legally authorized representative * Age ≥ 18 years old on the date of consent * IT/IV cohorts: Any metastatic or advanced solid tumor with documented radiological progression following at least two prior lines of treatment (which may have included prior immune checkpoint inhibitor (ICI) treatment). Expansion cholangiocarcinoma IT and IV cohorts: one prior line of chemotherapy in metastatic/advanced setting. Patients with targetable tumor mutations must have also received 1 line of approved targeted therapy. * Expansion cholangiocarcinoma IV cohort: prior treatment with leucovorin calcium, fluorouracil, or oxaliplatin is not permitted. * ECOG performance status 0 - 2 * At least one measurable lesion * For IT administration, ideally \< 5 total lesions no greater than 10cm and \<33% of liver volume replaced by tumor. * Adequate renal function * Adequate liver function * Adequate hematologic function * Willing and able to comply with scheduled visits, treatment plan, laboratory tests, and other study procedures Exclusion Criteria: * Prior treatment with a poxvirus based oncolytic virus. * Continuous systemic treatment with either corticosteroids (\>10 mg daily prednisone equivalents) or other immunosuppressive medications within 4 weeks prior to first dose of study treatment. * Prior radiotherapy within 2 weeks of start of study treatment. * Active autoimmune disease * Prior allogenic tissue/organ transplant or oth…