Breuss juice protocol how soon can be repeated

Hi everybody,
My wife has GBM IV diagnosed in January 2010. She went through surgery, radiation and 2 sessions of chemo. She was not responsive to the chemo, and they sent her home for palliative care. She did the full 42 days of treatment with freshly made juice (black radish can be found in health market stores). She improved a lot during the treatment, her dexamethazone was reduced from 24 mg/day to 3 mg/day, and she has minimum seizure medication (500 mg kepra/day). I did the protocol with her to be the witness and better understand what she will go through, but I had to stop after 5 weeks, my strength would not allow me to properly care for her. She is now on on Johanna Budwig diet.
Due to the fact that she did not have her MRI yet, I am very cautious not to have her tumor start growing again.
My question is, has anybody knowledge how soon can the protocol be repeated?

Thanks. Regards,

NGU