Cancer tumors thrive on Sugar that they get from blood. The higher the blood Sugar the faster a tumor grows. To shrink a tumor, reduce blood sugar. The fastest way to do this is to fast, drinking only water, not sweet juices. Some lemon in the water is ok becuase it provides little sugar.
Several natural cures for cancer involve fasting for 12 to 16 hours a day and several other avoid sugars almost completely. The real answer to long life is caloric restriction.
I prefer my water mineralized with calcium (pickling lime), magnesium (Epsom salt), potasium (No Salt), and a bit of sodium bicarbonate for added alkalinity.
Measure your tumor, try this for 1 week and post back.
Start with mineral water fast for 24 hours (add a little lemon for taste if you wish). Eat a minimum meal with low glycemic index (preferably a good vegetable meal) 3 times with a 4 hour gap between each. Fast 16 hours, eat again as before.
After 1 week measure the tumor. It will shrink. Sometimes a little, sometimes a lot.