...just to add, if you post your question on Yahoo's non-Hodgkins Lymphoma forum you will find people who have gone through all types of procedures as well as those who have Mantle Cell NHL. As you've seen, this forum concentrates on alternative methods.
Of course, stem cell transplants can work very well for certain types of lymphomas so all aspects would need to be looked at but
If your aunt wishes to look into alternaive methods at some point I would suggest you contact "Dottie" who has appeared on this forum and she could give you the new contact details of someone who can talk to you or your aunt about an alternative treatment he knows for mantle cell lymphoma.