An
oncolytic virus for use in a method of treating or preventing cutaneous squamous
cell carcinoma (CSCC),
renal cell carcinoma (RCC), non-
small cell lung cancer (NSCLC),
triple negative breast cancer (TNBC),
small cell lung cancer (SCLC), advanced recurrent
head and neck cancer, squamous
cell carcinoma of the
head and neck (SCCHN),
nasopharyngeal carcinoma (NPC),
hepatocellular carcinoma (HCC), anal cancer,
colorectal cancer (CRC),
basal cell carcinoma (BCC), Merkel
cell carcinoma, appendiceal carcinoma,
sarcoma of the
skin, recurrent
melanoma after
surgery, advanced or metastatic urothelialcarcinoma, liver metastases,
microsatellite instability high cancer (MSI-H), mixed advanced
solid tumors, virally caused cancer, locoregionally
advanced cancer, pediatric cancer, cancer in patients with no or minimal pre-existing anti-cancer
immunity, cancer as
first line therapy, cancer in
previously treated patients, cancer in patients who have not received checkpoint
blockade therapy, and / or cancer in patients who have received checkpoint
blockade therapy, wherein the
oncolytic virus: is, or is derived from, a clinical isolate which has been selected by comparing the abilities of a panel of three or more clinical isolates of the same viral species to kill
tumor cells of two or more tumor cell lines
in vitro and selecting a clinical isolate which is capable of killing cells of two or more tumor cell lines more rapidly and / or at a lower
dose in vitro than one or more of the other clinical isolates in the panel; comprises (i) a fusogenic
protein-encoding
gene; and (ii) an immune stimulatory molecule or an immune stimulatory molecule-encoding
gene; comprises (i) a GM-CSF-encoding
gene; and (ii) an immune co-stimulatory pathway activating molecule or an immune co-stimulatory pathway activating molecule-encoding gene; and / or comprises a gene encoding a CTLA-4 inhibitor.