Relapse MM - treated with velcade again?

My Dad was diagnosed with myeloma two days after his 60th birthday in August 2005.The diagnoses absolutely devastated the whole family although we all stayed strong for each other.It amazing the strength you get when something like this happens.Dad was subsequently treated with radiation as he had a compressed spinal cord and treated with dex and thailidomide with a stem cell transplant to follow.Dad suffered severe neuropathy and after just a under a year in remisson he relapsed and began velcade followed by another stem cell transplant.Again he went into remission for just ove ra year efore he relapses.About 6 months ago he started revlimid and dex and since has suffered numerous infections and series drops in cell and hemoglobin.However he did go into remission again for 6 months.Dad recently was admitted to intensive care with renal failure(apparently not due to the myeloma but infection).It all happened so quick. We have been told that the revlimid is not working for him and that in order to give him more time the consultants have decided to put hm back onto valcade as this is the treatment that gave hin the greatest remission.I thought that you cannot treat myeloma with the same drug twice as it does not work. Hs anyone been treated with Velcade again after a relapse?I would appreciate any feedback from anyone on this or any treatment options that would be available to my Dad as we want more time with him.I cant image him not been in my life.