What is an enrollment halt?

A pause in recruiting — sometimes routine safety review, sometimes the first sign of trouble.

Halts can be planned (data review after a pre-specified number of events) or unplanned (regulator or safety board action). The registry shows 'suspended, enrollment'; the reason arrives later, if ever.

Our diff engine flags enrollment-status changes as severity-2 events: the registry update often precedes any disclosure by weeks.

See it live: the catalyst calendar · status-change feed