i wouldn't rely on one single herb to cure cancer, seeing as it won't be powerful enough. No herb is that powerful in such a small amount of time.
If I had cancer, I would go on a 100% raw fruit and leafy green vegetable, salad, and herb diet only. Then I would complete a couple of grape juice fasts. Actually, you might want to fast for 3 weeks or more on fruit juice and herb juice.
There are powerful mushrooms too that you could eat that are good for the immune system-reishi, chaga, maitake, shiitake
but the fastest natural way to reverse cancer is fasting on fruit and vegetable juices.
Otherwise, you are out of luck, and would have to go with chemotherapy.