BX and BY are two of many forms of the same organism that Rife tracked as the virus that causes cancer.
To consider it the only cause of cancer would probably be premature in thinking even if it is correct. We have not had time to rule out all other possible causes in my opinion.
The other frequencies you see are from other researchers. I don't have all the details for each of the frequency programs to state how they were developed in detail. Given that they probably could not use the same methodology that Rife employed, they would most likely have gone with cause and effect with repeatability models. Each set would require one to do some research to dig up the history.
For more details, please check the link: