> Since there are some 1,000 cancer-related genes and each cancer requires up to three distinct gene alterations to succeed, every cancer patient is literally o

> Since there are some 1,000 cancer-related genes and each cancer requires up to three distinct gene alterations to succeed, every cancer patient is literally one in a billion. Errors in his math: - not every combination of any of the 3 genes (1000999998 = "1 billion" ordered combinations) causes cancer - the order doesn't matter - the occurrence rates of each mutation are not the same and don't appear in the same rate among various populations Thus, the number of kinds is much smaller than 1 billion, and many people do have the same type genetically.