The invention relates to methods of treating tumours comprising delivering an oncolytic virus or oncolytic viral RNA via direct injection or systemic administration or intravesicular administration to the tumour or cancer in combination with the co-administration of an immuno-stimulatory agent via the systemic route to a mammal.

Methods of inhibiting or reducing tumor growth are disclosed. A composition containing at least one selected oncolytic virus is administered within a tumor of a patient. The virus kills cancerous cells and induces a systemic and lasting anti-tumor immunity that is also compatible with other cancer treatments. Also disclosed are methods of creating synthetic viruses for targeting cancerous tumors.

A replicating oncolytic virus vector is provided having a modified Enterovirus genome (e.g., a Poliovirus, Coxsackievirus or Echovirus genome), wherein the modified Enterovirus genome has one or more copies of one or more miRNA target sequences inserted into the UTR region (e.g., via substitution) and/or in-frame within the coding region of the Enterovirus genome. Also provided are compositions and methods for treating cancer (including for example, lung cancer).

Methods of inhibiting or reducing tumor growth are disclosed. A composition containing at least one selected oncolytic virus is administered within a tumor of a patient. The virus kills cancerous cells and induces a systemic and lasting anti-tumor immunity that is also compatible with other cancer treatments. Also disclosed are methods of creating synthetic viruses for targeting cancerous tumors.