I'm not an expert - you really need to speak to a doctor on this - but it seems from cursory investigation that there are 5 types of benign tumours of the spine, ie they can cause problems by sitting on nerves etc but probably aren't life threatening, and 7 types of malignant tumours, which if untreated are life threatening. Of the 7, the 'worst' type is Ewing�s Sarcoma, with a 5 year survival rate of 20%. The others vary upwards from that figure. In addition, the following typoes of cancer can spread to the spine:
Lung cancer,Breast cancer, Prostate cancer, Thyroid cancer, Kidney cancer.
As with all cancers, early identification and treatment is key to survival, but it seems there are no untreatable types if caught early enough.
Good luck - but see a doctor or call NHS Direct or VHI Direct (if in Ireland)