Hi Dr. Simoncini in Italy used Baking soda to kill cancers. The good thing is that cancers in the digestive tract can be treated directly by drinking a baking soda and water solution. Smaller more frequent doses are better as larger does cause a rebound effect at the blood tries to compenstate for the increased pH as the body must always keep the Blood pH between 7.35 and 7.44. So, smaller and more frequent is better I think.
You can read about Dr. Simoncini's comments on treating stomach cancer here: