Where can I achieve address to do post doctoral research on cancer?

Ask the universities.
Do you hold a doctorate? If so, aren't you familiar next to some researchers that are working in your nouns of interest? Perhaps your advisor has some planning?
Try your rearch engine.
Do a PUBMED search for general public doing specific work of interest. Get their papers from your local medical school library. Read them. Contact the authors. Most labs are intense for well-read, highly motivated post-docs.