In this phase I/II trial, immunostimulatory gene therapy (AdCD40L) will be investigated. In Part 1 patients with melanoma (n=6) will receive AdCD40L as mono therapy. In Part 2A, patients with melanoma (n=9) and patients with other solid tumors (n=6) will receive AdCD40L in combination with low dose cyclophosphamide. In Part 2B, patients with melanoma will receive AdCD40L in combination with one local radiotherapy and cyclophosphamide. AdCD40L is given by weekly injections of 2.5x10e11 VP, 4x; total dose 1x10e12 VP. A maximum of 30 patients will be included in this trial.