Scott J, Iorfino F, Capon W, Crouse J, Nelson B, Chanen AM, Dwyer D, Conus P, Bechdolf A, Ratheesh A, Raballo A, Yung A, Berk M, McKenna S, Hockey S, Hutcheon A, Scott E, McGorry P, Shah J, and Hickie IB
Globally, 75% of depressive, bipolar, and psychotic disorders emerge by age 25 years. However, these disorders are often preceded by non-specific symptoms or attenuated clinical syndromes. Difficulties in determining optimal treatment interventions for these emerging mental disorders, and uncertainties about accounting for co-occurring psychopathology and illness trajectories, have led many youth mental health services to adopt transdiagnostic clinical staging frameworks. In this Health Policy paper, an international working group highlights ongoing challenges in applying transdiagnostic staging frameworks in clinical research and practice, and proposes refinements to the transdiagnostic model to enhance its reliability, consistent recording, and clinical utility. We introduce the concept of within-stage heterogeneity and describe the advantages of defining stage in terms of clinical psychopathology and stage modifiers. Using examples from medicine, we discuss the utility of categorising stage modifiers into factors associated with progression (ie, potential predictors of stage transition) and extension (ie, factors associated with the current presentation that add complexity to treatment selection). Lastly, we suggest how it is possible to revise the currently used transdiagnostic staging approach to incorporate these key concepts, and how the revised framework could be applied in clinical and research practice., Competing Interests: Declaration of interests SH and AH are youth members of the Lived Experience Working Group (University of Sydney), and have an interest in clinical staging; all other authors are members of the International Working Group on Transdiagnostic Clinical Staging in Youth Mental Health. JSc is a visiting professor at Université Paris Cité, the Norwegian University of Science and Technology, Swinburne University of Technology, and The University of Sydney, and is a Science without Borders fellow (Brazil); has received grant funding from the UK Medical Research Council and the UK Research for Patient Benefit programme, and currently is a collaborator on several grants funded by Horizon 2020, the Medical Research Council in Australia, and the Wellcome Trust; and declares no financial or other conflict of interests in relation to the topics addressed in this Health Policy paper. AMC is Chief of Clinical Practice at Orygen, Australia, a Director of the Board of Australia's Youth Mental Health Foundation (Headspace), and Director of the Board of the National Education Alliance for Borderline Personality Disorder, Australia. MB is supported by a National Health and Medical Research Council Senior Principal Research Fellowship grant, and has received grants, speaker, or consultancy fees from the Royal Australian and New Zealand College of Psychiatrists, Abbott India, American Society for Clinical Pathology, Headspace, Sandoz, Milken Institute, Australia Psychosis Trust, Lundbeck, Controversias Barcelona, Servier, Medisquire, HealthEd, Australian and New Zealand Journal of Psychiatry, US Environmental Protection Agency, Janssen, Medplan, Wellcome Trust, Medical Research Future Fund, Victorian Medical Research Acceleration Fund, Centre for Research Excellence, and the Victorian Government Department of Jobs, Precincts and Regions–Victorian COVID-19 Research Fund. ES is the Medical Director of the Young Adult Mental Health Unit, St Vincent's Hospital Darlinghurst; Discipline Leader of Adult Mental Health, School of Medicine, University of Notre Dame; and is a Research Affiliate at The University of Sydney and Consultant Psychiatrist. ES has received honoraria for educational seminars related to the clinical management of depressive disorders supported by Servier and Eli Lilly; has participated in a national advisory board for the antidepressant compound Pristiq, manufactured by Pfizer; and was the National Coordinator of an antidepressant trial sponsored by Servier. PM has received past unrestricted grant funding from Janssen-Cilag, AstraZeneca, Eli Lilly, Novartis, and Pfizer, and honoraria for consultancy and teaching from Janssen- Cilag, Eli Lilly, Pfizer, AstraZeneca, Roche, Bristol Meyers Squibb, and Lundbeck. PM has received grant funding from the Colonial Foundation, the National Health and Medical Research Council of Australia, the National Alliance for Research on Schizophrenia and Depression, the Stanley Foundation, the National Institute of Health, Wellcome Trust, and the Australian and Victorian governments; has been granted patents for the prevention and treatment of psychotic disorders using omega-3 polyunsaturated fatty acids in Australia, the USA, and Canada (AU 2015203289, 2017; US 9884034, 2018; US 10314805, 2019; and CA 2773031, 2021), and has a further pending patent application (US 20190321320). PM is Director of the Board of Australia's Youth Mental Health Foundation (Headspace), and Executive Director of Orygen, Australia's National Centre of Excellence in Youth Mental Health. IBH was a Commissioner in Australia's National Mental Health Commission from 2012–18; and is the Co-Director, Health and Policy at the Brain and Mind Centre, University of Sydney. The Brain and Mind Centre operates early-intervention youth services at Camperdown, under contract to Headspace. IBH has previously led community-based and pharmaceutical industry-supported (Wyeth, Eli Lilly, Servier, Pfizer, and AstraZeneca) projects focused on the identification and better management of anxiety and depression; is a Board Member of Psychosis Australia Trust, and a member of Veterans Mental Health Clinical Reference group. IBH is the Chief Scientific Advisor to, and an equity shareholder in, InnoWell. InnoWell has been formed by the University of Sydney and PwC to administer the AU$30M Government-funded Project Synergy. Project Synergy is a 3-year programme for the transformation of mental health services through the use of innovative technologies. All other authors declare no competing interests., (Crown Copyright © 2024 Elsevier Ltd. All rights reserved, including those for text and data mining, AI training, and similar technologies.)