Hello there :)
I don't have cancer but I always have been into nutrition.
I have heard indeed that
juicing was ideal in case of diseases. It is a way for your body to process nutrients even if your intestinal tract is not working properly. Broth and juices go straight through the walls of your gastro intestinal tract into your blood steam.
Juicing is good, but as I indicated in my previous post on this thread, let's not forget that when juicing, we only get vitamins and minerals, and no fibers at all. To get the fibers you'd need to blend rather than juice. We need fibers to have daily bowel movements.
Now, about the content of
Sugar in fruits, it is indeed important. "IF" we agree with the idea that cancer is caused by a parasite, like some sort of candida, we don't want to feed it.
This chart might help finding the best fruits to juice
http://thepaleodiet.com/fruits-and-sugars/
As for a diet, why not try the paleo diet ? It's fraught with super food.
Green leafy veggies are good for you. Careful however not to eat too much of them as they might irritate your bowels (too much fiber will irritate your intestinal tract).
This website speaks about alternative natural treatment for cancer and about the benefits of carrot juice.
http://www.new-cancer-treatments.org/
Also have you heard of "hemp oil" and of his creator Rick Simpson? This is an oil produced from cannabis. It is used with AIDS patients to alleviate side effects of medications and with cancer patients to actually cure their cancer.
The best, if you can legally grow cannabis, is to produce your oil yourself so as not to get scammed.
Those are suggestions. As I said, I don't have cancer, I am not a doctor either. I don't know if natural treatment can actually compare with chemotherapy's efficience. But if you don't feel listened to by your doctors, I advise you find a naturopath to monitor you and give you some extra support.
I also heard olive leaf extract could help treat cancer by reducing tumors. And if it doesn't, at least it will make you feel energetic again.
All the best !