A method and system for combination therapy utilizing local drug delivery and radiotherapy at a target site of body tissue are provided. The delivery system comprises a source electrode adapted to be positioned proximate to a target site of internal body tissue. A counter electrode is in electrical communication with the source electrode, and is configured to cooperate with the source electrode to form a localized electric field proximate to the target site. A cargo may be delivered to the target site when exposed to the localized electric field. Radiotherapy is applied to the target site in combination with the local drug delivery.
