New comment by gus_massa in "Hydroxychloroquine Probably Isn’t the Answer"

Note that some cancers kill you very fast and other kill you in a very long time, so you have a chance of die from another cause.

If the study in a small group proves that the miracle drug is ineffective and moreover it reduces the life expectancy to 1/2, then by not giving it to everyone avoid the nasty effect of reducing the life expectancy of a lot of people.

Take a look at some "miracle" cures of cancer of the past, like https://theincidentaleconomist.com/wordpress/the-rise-and-fa...

Also, since a few years in Prostate Cancer the recommendation is not to treat all cases after detection https://en.wikipedia.org/wiki/Prostate_cancer#Management

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