The Ruta protocol discussed here seems to help a lot of people, at least with a dramatic lessening symptoms, and some reports of complete regression. Dr. Banerji seems to recommend the same initial dosage for everyone - alternating Ruta 6C and Cal Phos 3X twice a day - and for more acute cases recommends the same dosage 3 times a day, or every 3 hours, as another user stated, 5 of the Ruta 6c and 2 of the Cal Phos 3X.
With homeopathic remedies, the active ingredient is so diluted there is no danger of any overdose or toxicity issue. There seems to be no contraindication to using it in combination with chemo or radiation treatments (in many related experiences, it seems to help those treatments).
We found the Ruta 6C at a local Whole Foods store, but couldn't find Cal Phos in a 3X dilution locally. We ordered it from 800Homeopathy. com - their phone number is 1-800-466-3672 - it was very inexpensive and arrived in 2 days via priority mail (we already had the Ruta by then but you could probably order it too from them too).
If you're not familiar with taking homeopathic remedies, it's important not to touch the pills with your fingers - tip them into the cap and pour them into your mouth. Let them melt under your tongue (sub-lingual). Do not eat, drink or smoke within 15 minutes before or after taking the remedy.