It is common knowledge that it’s better to catch cancer in an early state than later. The reason is that over time tumors can become more complex—so much so that taking a biopsy at one tumor location may suggest a course of treatment that is not called for from a biopsy at another location.  While this raises a perplexing problem for genomic diagnostics once cancer has presented, it also suggests that predictive DNA sequencing before any cancer appears may be the best anticancer strategy.  MORE