It’s uncommon enough that large scale preventative screening (like we have for colon cancer, for instance) isn’t economically viable or feasible, yet it also has a tendency not to produce any symptoms until it is already advanced into other organs (it also has a tendency to spread to the liver, a nasty place to get metastasis to). So people don’t tend to find out it’s there until it’s already too late to do anything highly effective to get rid of it.
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