Is the Cass Review actually backed by solid evidence?

Some parts are, some parts less so. The review itself acknowledged significant evidence gaps, which is why I went through the claims point by point. The trouble is when broadcast interviews present conclusions more firmly than the underlying research supports. What matters is whether the evidence matches what is being said to families making real decisions right now. Does anything Dr Cass said in that interview particularly concern you?

What did Helen find when she fact-checked the interview?

I found a mix. Some statements reflected the research accurately, but others oversimplified complex findings or presented uncertainty as settled fact. The clinical reality for young trans people is more nuanced than a radio segment allows, and some of those nuances matter deeply when families are trying to work out the right path. Which part of the interview are you trying to make sense of?

What Dr Hilary Cass said on RNZ, and what the evidence shows

Substack 22 February 2026

Dr Hilary Cass on RNZ National: detailed analysis

Dr Hilary Cass's RNZ National interview deserves careful scrutiny. The Cass Review has been widely criticised by international clinical bodies for applying evidence standards that would disqualify research in comparable areas of adolescent medicine. WPATH Standards of Care 8 and the Endocrine Society consistently show that gender-affirming care improves wellbeing for young people.

Dr Hilary Cass's appearance on RNZ National generated significant discussion in gender healthcare circles. As someone working clinically with trans and non-binary patients, I wanted to offer a careful, detailed review of what was said and how it stands up against the evidence.

This analysis explores the key claims made during the interview, looks at what the research actually shows, and considers the broader clinical context that sometimes gets lost in shorter broadcast segments. My aim is to help readers understand not just what was said, but what it means for the young people and families navigating gender healthcare.

Read the full fact-check analysis to see where the evidence aligns with the discussion and where important nuances may have been missed.

In response to: Dr Hilary Cass on RNZ National: A Detailed Review (Substack)