vitamin K would be good - if no side effects and prevents cancer then you have a winner; That will not really happen, but from everything I have read about K, it is and will be an extremely effective treatment for certain cancers , either alone or in combination with other treatments. Too bad that many suffering cannot benefit from it now, but that is how the system works. A lot of testing before fda approval. So far, everything looking positive and perhaps it will be "fast-tracked" to get to patients sooner. ( B , a new class of antibiotic that is also is very promising, should also start moving quicker toaward approval)