In the instance of cancer, the recommended dose depends upon the stage and aggressiveness of the cancer. Success can be very much dose dependent, especially with later stage, more difficult and/or more aggressive cancers.
The minimum therapeutic dose is one capsule twice daily, which would be the suggested dose for a stage 1 or early stage 2 cancer that was not a rapidly growing cancer. For late stage 3, stage 4 and/or aggressive cancers the maximum therapeutic dose of up to 8 capsules a day could be required. Personally, if I had cancer I would start with one or two capsules a day and work myself up to 4 or more per day at least, and more if the situation called for it.