Overview

Breen v. Olson-Kennedy is a medical negligence lawsuit filed on 5 December 2024 in Los Angeles County Superior Court by Kaya Clementine Breen, a former patient of the Center for Transyouth Health and Development at Children's Hospital Los Angeles (CHLA). The complaint names Dr Johanna Olson-Kennedy, CHLA and its medical group, the surgeon Dr Scott Mosser and his San Francisco practice, St. Francis Memorial Hospital, and the therapist Susan P. Landon. It alleges that Breen was given puberty blockers at 12, testosterone at 13 and a double mastectomy at 14 without adequate assessment of her trauma and mental health, and without proper informed consent (UniCourt docket; NBC News 2024).

The case never reached the merits. On 29 October 2025 Judge Joseph Lipner ruled that the claims were filed outside California's three-year limitation period, and on 10 November 2025 he entered judgment for all defendants. Breen has appealed. As of October 2026 the appeal is pending in the California Court of Appeal, and no appellate decision has been reported (MyNewsLA 2025b; WND 2026).

Background

Breen, who goes by her middle name Clementine, was 20 and a UCLA student when she filed the suit. She spoke publicly about the case in interviews with The Economist, NBC News, Fox News and others, and her lawyers released the complaint. Court records also list her as "aka Finn Paul Breen". Some outlets misspell her first name as "Kayla", and reports differ on how they describe the hospital defendant (the docket names St. Francis Memorial Hospital; NBC News described it as UCSF Health Community Hospitals) (Ryan 2024; UniCourt docket).

According to the complaint, at age 11, in autumn 2016, she told a school counsellor that "life would be so much easier if she were a boy". The counsellor allegedly told her she was transgender and told her parents the same. Her parents then took her to Olson-Kennedy's clinic at CHLA (Catholic News Agency (CNA) 2024). The complaint says she had been sexually abused at around age 6–7. It describes anxiety, depression, autism, undiagnosed post-traumatic stress disorder (PTSD) and a family history of mental illness, and says none of this was explored before treatment (Assigned Media 2024, a trans-advocacy outlet quoting the complaint; Daily Wire 2024).

The complaint says she received testosterone from 13 to 19. Late in high school she began seeing a dialectical behaviour therapist. Through that therapy, it says, she came to believe her distress had been driven by unresolved trauma, not a transgender identity. She tapered testosterone and stopped in early 2024, and she now lives as a woman. She has said she is considering breast reconstruction. Her lawyer has said she is taking estrogen (Ryan 2024; CNA 2024). On Fox News she said:

At the time of my mastectomy, I had no idea really what I was doing. — Clementine Breen on Hannity (Washington Examiner 2024)

Asked what she hoped the suit would achieve, she told NBC News she wanted "some semblance of justice or change" and to "help dismantle the rumor that no one is ever fast-tracked into gender treatments" (NBC News 2024).

Olson-Kennedy was medical director of the CHLA centre, which was one of the largest youth gender clinics in the US. She had publicly argued that comprehensive psychological assessment before medical transition can amount to unnecessary "gatekeeping". In 2018 she told the journalist Jesse Singal: "I don't send someone to a therapist when I'm going to start them on insulin" (Singal 2024). CHLA closed the centre in July 2025; the Los Angeles Times reported that the hospital cited pressure from the federal government (Los Angeles Times 2025).

The claims

The complaint is a professional negligence (medical malpractice) action. It also alleges fraudulent and "malicious, and oppressive" conduct, which matters for punitive damages and for the limitation period (see below). Breen seeks damages for medical costs, pain and suffering, and costs, and asked for a jury trial (Ryan 2024; CNA 2024). All of the following are allegations.

Against Dr Olson-Kennedy and CHLA

• Diagnosis at the first visit. The complaint alleges that at the first appointment on 27 December 2016, shortly after Breen turned 12, Olson-Kennedy diagnosed gender dysphoria "after mere minutes" and recommended an implanted puberty blocker, without a mental-health assessment or questions about trauma (MyNewsLA 2025a; California Globe 2024, a conservative outlet quoting the complaint).
• Blockers described as "completely reversible". It alleges Breen and her parents were told blockers were like pressing pause and were "completely reversible", and were not told the known risks (California Globe 2024). See puberty blockers.
• Testosterone and the suicide argument. It alleges that at a visit on 9 September 2017 Olson-Kennedy recommended testosterone to "keep you on track". Breen "hesitantly agreed", but her parents objected. The complaint alleges Olson-Kennedy then told them Breen was suicidal and would commit suicide without hormones, and asked whether they would "rather have a living son or a dead daughter". It says Breen had never had or expressed suicidal thoughts. Testosterone allegedly began on 26 January 2018 (CNA 2024; Daily Wire 2024). See the "transition or suicide" narrative.
• The surgery letter. The complaint alleges that Olson-Kennedy's letter supporting surgery said Breen had "endorsed a male gender identity since childhood", while her own notes recorded that the questioning had begun only months before. The Economist obtained the letter and reported this claim. Jesse Singal, who wrote that story, said on his own newsletter that Breen's lawyers shared Olson-Kennedy's clinic notes with him and that many of the allegations are "substantiated" by them. This is a journalist's reading of the records, not a court finding (Singal 2024; Ryan 2024).
• Hysterectomy. It alleges Breen was urged to have a hysterectomy at 17 (California Globe 2024).
• Diagnostic overshadowing. The core theory is that her co-occurring conditions should have been treated first, and that focusing on gender dysphoria hid them. The complaint says she "needed psychotherapy for an extended period of time… Instead, she was fast-tracked" (Ryan 2024). See mental health and gender dysphoria and trauma.

Against Dr Mosser, his practice and the hospital

The complaint alleges that the mastectomy on 14 May 2019, at 14, followed "a brief, 30-minute pre-op meeting". It says the consent form was "facially deficient" because it did not disclose the experimental nature of the procedure, the known risks, or alternatives (CNA 2024). See mastectomy.

Against Susan Landon

Landon, a licensed marriage and family therapist recommended by the clinic, is alleged to have affirmed Breen's identity without exploring her trauma (Ryan 2024; Singal 2024b).

Alleged harms

The complaint says Breen's mental health got worse during treatment. It describes depression, psychosis with hallucinations, self-harm and a suicide attempt, and says none of these had happened before. It lists permanent effects: a deepened voice, a masculinised body, likely infertility, inability to breastfeed and bone-health risk (CNA 2024; MyNewsLA 2025b). See testosterone in females and fertility.

Defendants' position

The defendants have not publicly answered the medical allegations in detail, and the case ended before any answer on the merits was needed.

• CHLA told reporters it does "not comment on pending litigation" and does not comment on specific patients, out of respect for patient privacy and in line with state and federal law (CNA 2024).
• The Gender Confirmation Center / Dr Mosser. A spokesperson cited HIPAA (the US federal law protecting the privacy of patients' health information) and pending litigation. They pointed to a statement by Mosser describing the centre as "at the forefront of gender-affirming surgery, with the wellbeing of our patients as our highest priority" (NBC News 2024).
• Susan Landon, through her lawyer, told Singal that all her session notes with Breen had been lost to water damage (Singal 2024b).
• Limitation defence. The defendants' main argument in court was that the claims were time-barred. At the 28 October 2025 hearing, lawyers for Olson-Kennedy and CHLA argued that Breen's own complaint showed she knew of the harm she alleges as early as January 2018 and no later than August 2019, more than three years before she filed in December 2024 (MyNewsLA 2025c).

Critics of the suit have also challenged it. Assigned Media, a trans-advocacy outlet, wrote that the "veracity of her claims" was unclear. It pointed to a gap between the testosterone start date in the complaint and the date Breen gave in an earlier podcast interview, and it argued that detransitioners are being used by anti-trans activists (Assigned Media 2024). This is commentary, not a defendant's filing.

Procedural history

Breen was represented by the Center for American Liberty, a conservative public-interest firm (Harmeet Dhillon's organisation), together with LiMandri & Jonna and Campbell Miller Payne, a Dallas firm that specialises in detransitioner suits (California Globe 2024; Center for American Liberty, the plaintiff's counsel).

Outcome and current status

As of October 2026: judgment for the defendants on limitation grounds; on appeal.

The trial court did not rule on whether any defendant breached the standard of care, whether the alleged statements were made, or whether treatment caused harm. It decided only that the suit came too late. The published written reasoning was not available to us. Reporting describes the ruling as finding the filing date "in violation of the three-year statute of limitations" (MyNewsLA 2025b), and says the amended complaint still could not overcome it (Ryan 2025).

The judgment entry lists a total of $0.00, and one defendant (Landon) filed a memorandum of court costs of about $1,380 (UniCourt docket). Breen told Benjamin Ryan: "While it's disappointing, I'm not surprised" (Ryan 2025).

The limitation rule

California's limitation rule for medical negligence is Code of Civil Procedure § 340.5. A claim must be filed within three years of the injury or one year after the plaintiff discovers (or should have discovered) it, whichever comes first. Nothing extends the three-year outer limit except proof of fraud, intentional concealment, or a foreign body left inside the patient. For minors, the claim must be filed within three years of the wrongful act. Children under six get until their eighth birthday if that is longer, and the period is tolled (paused) if a parent and the provider or its insurer colluded or committed fraud in failing to bring the claim. Otherwise, being a minor does not pause the clock (CCP § 340.5).

Applied to the dates in the complaint, the three-year periods from the start of testosterone (January 2018) and from the mastectomy (May 2019) ended in 2021 and 2022, when Breen was still a teenager. The defendants said the complaint itself showed she was aware of the harms by then. The complaint's allegations of fraud and "oppressive concealment" are the kind of facts that can toll the outer limit under § 340.5. The trial court evidently found them insufficient. The appeal is expected to test that question. Public reporting we found does not describe the plaintiff's opposition arguments in detail.

Significance

• It names the most prominent defendant yet. Olson-Kennedy was among the best-known US clinicians in youth gender medicine, and journalists described this as the highest-profile clinician named by a detransitioner (Ryan 2024). The complaint directly challenges the low-assessment, "affirming" model she had publicly defended. See evidence reviews for how systematic reviews such as the Cass Review (the 2024 independent review of NHS gender services for young people in England) have since judged the evidence for blockers and hormones in minors.
• Limitation law as the main barrier. The case shows a structural problem many detransitioner suits share. Under rules like § 340.5, the clock can run out while the patient is still a minor and still identifies as trans. The lawsuits hub compares states, including North Carolina, which extended its limit for transition-related claims to ten years in 2025. We found no comparable change in California as of October 2026.
• Precedent. A trial-court ruling does not bind other courts. A published Court of Appeal opinion on whether fraud or concealment allegations can toll § 340.5 in a gender-medicine case would affect future California claims, whichever way it goes.
• Reactions. Supporters of the suit, including the plaintiff's counsel and conservative outlets, present it as evidence that minors were "fast-tracked". Trans-advocacy outlets such as Assigned Media and TransgenderMap present the dismissal as showing that the claims did not hold up, and describe the case as politically driven. Neither reading is supported by the ruling, which did not address the facts.

Some trans people worry that lawsuits like this one will make providers more cautious for everyone. One trans woman wrote, in a thread about state restrictions:

suing after the fact is cold comfort. When a delay in care means life-altering consequences, there is nothing that can bring that back. —AliceActually, trans woman (MTF)

What detransitioners say about the case

Searches of the r/detrans archive turned up no comments that discuss Breen's case by name, so the quotes below concern the issues it raises. Several detransitioners describe the same problem that ended Breen's case, which is that the limitation period expired before they understood what had happened:

it diminished my legal rights (ran out the clock on statute limitations for some practitioners). —jadepraerie, detransational

There was no way for me to, within that timeframe, understand what had happened since she fucked me up so badly I couldn't even access my memories it! —xyz-roygbiv

The "living son or dead daughter" line alleged in the complaint is familiar from other accounts:

I was in the room when my endocrinologist said to my parents "would you rather an alive daughter or dead son." It's such a dangerous statement, especially in front of the child. —Even_Discipline_7474, socially trans – regrets entire transition

This sort of rhetoric completely weaponises the care and love that parents have for their children. —Hedera_Thorn, detrans male

So is the complaint's central theory, that sexual abuse went unexplored:

I was sexually abused as a child, and my therapists knew that. Yet, it was never discussed in any session. —sleezymu1a, detrans female

Not all detransitioners support litigation. Some worry about personal responsibility and about being used politically:

you are paying the doctor to do a cosmetic procedure and you shouldn't sue them for getting what you asked for. —lowrcase, desisted female

I'd like to see support for detransitioners that actually helps us instead of using us as political pawns. —chachidubss, detrans female

People thinking about a claim can find detransition support and gender-exploratory therapists in the support directory.

Related pages

• Detransitioner lawsuits: cases, claims and outcomes
• Puberty blockers
• Mastectomy and top surgery regret
• Evidence reviews
• Informed consent critique
• Suicide and transition
• Trauma

References

• UniCourt. Kaya Clementine Breen vs Johanna Olson-Kennedy, M.D., et al. (LA Superior Court docket summary). source.
• California Code of Civil Procedure § 340.5. source.
• MyNewsLA (2025a, 5 Aug). Children's Hospital Seeks Dismissal from Gender Affirming Care Lawsuit. source.
• MyNewsLA (2025c, 29 Oct). Judge Mulls Dismissal Motion in Gender Surgery Suit vs. Children's Hospital. source.
• MyNewsLA (2025b, 11 Nov). Judge Grants Judgment in Favor of CHLA, Doctors in Gender Surgery Suit. source.
• NBC News (2024). UCLA student sues California doctors, says she was 'fast-tracked' into transgender surgery. source.
• Catholic News Agency (2024). Woman alleges doctors 'fast-tracked' her into gender transition as preteen, files lawsuit. source.
• Ryan, B. (2024). Detransitioner Sues Johanna Olson-Kennedy, a Top Pediatric Gender Medicine Doctor, For Medical Negligence. source.
• Ryan, B. (2025). Detransitioner Lawsuit Against Dr. Johanna Olson-Kennedy Is Dismissed. source.
• Singal, J. (2024). Read My Story About A Major Detransition Lawsuit In The Economist. source.
• Singal, J. (2024b). What The Detransitioner Clementine Breen's Gender "Therapy" Looked Like. source.
• Washington Examiner (2024). Detransitioner says testosterone treatment caused 'more anxiety'. source.
• Daily Wire (2024; conservative outlet). Celebrated Trans Doctor Sued For Medical Negligence… source.
• California Globe (2024; conservative outlet). Children's Hospital Los Angeles Accused of Bamboozling Girl… source.
• Assigned Media (2024; trans-advocacy outlet). Dr. Olson-Kennedy Sued by Detransitioner. source.
• TransgenderMap (trans-advocacy site). Clementine Breen and transgender people. source.
• Center for American Liberty (plaintiff's counsel). Clementine Breen v. Johanna Olson-Kennedy, M.D. and Children's Hospital Los Angeles. source.
• WND (2026; conservative outlet). How are detransitioners faring in medical malpractice cases across country? source.
• Los Angeles Times (2025). End of transgender care at Children's Hospital L.A. signals nationwide shift under Trump. source.