Once someone has placed an answer without looking at the agreement in the discussion, I feel I have to put this into the mix too. According to the text (and also some distorted logic), those companies have no interest in solving the cancer conundrum. This 'answer' is said to be a solution, which they 'will never to let you see', although it could be the 'Holy Grail' of medicine. If we put in the meaning of the Hail Mary analysed in the discussion, it becomes illogical. The Hail Mary is a Catholic prayer (https://en.wikipedia.org/wiki/Hail_Mary), I don't think it could have much symbolic meaning for any science as it is not a solution, no connotations to discoveries, though it has a connotation of a thanks for something that miraculously and unexpectedly happened. On the other hand, the Holy Grail has a very old story of mystical meaning, which is established in the E lang, its original religious feeling is long lost and has the meaning of 'unbelievable', 'wonderful' panacea. This was my original explanation and I stick with it. Further references can be found in Charles' and gallagy's notes and my re-phrasing. Also, religious Christians say 3 Hail Mary's AFTER they succeeded whereas here the text states this "all-natural answer to cancer" is rejected by the industry ... so it is not a successful idea. Implied meaning is a contradiction, without expressly saying, "ALTHOUGH this could be ... of medicine." Here a THANKS, or a desperation solution doesn't fit, but a real, sensational solution like a Holy Grail does. Although in vain, at the moment. Of course I understand that it would be a solution for the desperate of today. But this meaning would require quite a bit of mental gymnastics in the context provided.