#$%^&*AU2020204209A120200716.pdf#####CONSTRUCTION OF ONCOLYTIC HERPES SIMPLEX VIRUSES (oHSV) OBLIGATE VECTOR AND CONSTRUCTS FOR CANCER THERAPY Abstract An obligate oHSV vector comprising modified viral DNA genome is provided. A recombinant oHSV-1 construct comprising the obligate oHSV vector and a heterologous nucleic acid sequence encoding an immunostimulatory and/or immunotherapeutic agent is also provided. Compositions comprising the recombinant oHSV-1 construct can be used for treating cancers.