This article outlines results from some recent studies into this question, which must be on the mind of many of us. It covers each of the non anti-TNF drugs individually, but the risk of cancer in each does not seem significantly greater than for people not treated with Biologics. Of course, because these drugs are still relatively new, long-term effects have yet to be established and continued research is required. Still, it’s a promising start.
Edit: For some reason the above link doesn’t work for everyone, so I copied the article here.