If they were brother and sister they probably grew up in the same house(s), ate the same food and so on for 20 years more or less. Too, how reliable/sophisticated is the genetic testing for various cancer indicators?
One of my high school classmates died of pancreatic cancer at about age 65. As far as I know he was never obese or smoked.
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"No one is more hated than he who speaks the truth." Plato
“To argue with a person who has renounced the use of reason is like administering medicine to the dead.” Thomas Paine
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