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Trial into puberty blockers for children paused over 'wellbeing concerns'

The MHRA halted recruitment for the Pathways trial after safety reviews found unquantified long-term risks and recommended raising the minimum participant age to 14.

  • On Friday the Medicines and Healthcare Products Regulatory Agency paused the PATHWAYS trial and halted recruitment until concerns are resolved, and it will meet King’s College London next week to discuss amendments.
  • Because the MHRA flagged unquantified long‑term risks, regulators re‑examined the PATHWAYS trial design after the Cass Review recommended restricting puberty blockers to research settings due to weak evidence.
  • MHRA advisers urged stronger bone‑density monitoring and tougher consent safeguards, recommending a graded approach starting at 14 as proposed lower limit for participants aged 10 to almost 16.
  • Campaigners and litigants, including JK Rowling, launched legal challenges that intensified scrutiny, while the Department of Health and Social Care and King’s College London said the trial will restart only if experts deem it safe and necessary.
  • MHRA will hold scientific discussions with the trial sponsor next week and any amendments must be reviewed by the Research Ethics Committee before restarting the PATHWAYS trial.
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GOV.UK broke the news in United Kingdom on Friday, February 20, 2026.
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