Hello Mr.Kimlambert, if the cause of your pain is that tumor
then that has to be removed as early as possible. Till then you can manage it with some strong analgesics. Some of the Electrotherapy
equipments could also be beneficial for you for temporary relief. Active assisted exercises for your both legs, hips might help you to some extent. If the tumor is narrowing the spinal canal
and impinging the nerve root
then few manual adjustments by an expert physiotherapist is required.. wish you a good health soon..