This is an interesting topic you have wrote about, however, a worrying one too. My husband back in September was diagnosed with bowel cancer, of which he never had a clue he had. It was a shock to hear because all his home screening tests for bowel cancer came back clear. Nevertheless, he is on the mend now after a seven hour operation to move a cancerous growth along with a hernia, of which also he didn't know he had... so a sort of double whammy if you like.. Thank you for sharing