Is bone Cancer the same as having cancer in your bone marrow? Explain the difference.

I had marginal zone lymphoma that was detected in my spleen. When the spleen was removed it was 8 lbs. They also removed some of the surronding lymph nodes and only 3 were found to have cancerous cells. It has been 2 years since my surgery and my blood work is very good the doctor tells me. How long before I will have signs that this disease is increasing and what are the signs.