Is siatica of the spine something that can be cured?

Yes: It usually resolves on its own. Usually a formal course of physical therapy and anti-inflammatory medications is warranted. Pain management such as epidural steroids can help. If all fails surgery may be warranted. See your orthopedic spinal specialist have this evaluated.

Yes: Many times it is self limiting meaning it will get better with time. This occurs 90% of the time when due to a disc herniation.

Cure, Unlikely...: Sciatica can be managed effectively and can be relieved in a vast majority of people, but it will always require diligence on your part for nsaids, exercise, stretching and weight control/loss. For those still having issues it may require treatments (injections, surgery, etc) to maintain relief as well.