Welcome to GRAPPA

Group for Research and Assessment of Psoriasis and Psoriatic Arthritis


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GRAPPA is organized exclusively for non-profit, educational, and scientific purposes, specifically to facilitate sharing of information related to psoriasis and psoriatic arthritis, networking among different medical disciplines that see psoriasis and psoriatic arthritis patients, and to enhance research, diagnosis and treatment of psoriasis and psoriatic arthritis.

View carefully curated slides with a comprehensive overview of psoriatic diseases

2024 Annual Meeting and Epidemiology Session Registration Open NOW

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eLearn with GRAPPA: Effective Clinical Communication for Improved Outcomes

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  • Provide a forum for networking and communication between international researchers in rheumatology and dermatology, industry, patient service leagues, and regulatory agencies
  • Provide the opportunity for in-person meetings and online communication to share knowledge, research findings, and develop or conduct collaborative research, education and other projects
  • Develop and validate a criteria set for the definition of psoriatic arthritis (PsA)
  • Review, develop and validate effective and feasible outcome measures for the assessment of PsA and psoriasis (PsO)
  • Promote the development of national and international collaborative registries of PsA and PsO patients to standardize the data being obtained and learn more about the natural history of the disease as well as its genetic underpinnings
  • Work closely with representatives of patient service leagues to promote public education and awareness of PsA and PsO
  • Work closely with representatives of member biopharmaceutical companies to promote and conduct research on effective therapies for PsA and PsO
  • Reach out to representatives of regulatory agencies to establish appropriate guidelines for regulatory approval of new therapies
  • Work with other professional organizations, such as the American College of Rheumatology, American Academy of Dermatology, and OMERACT to promote knowledge of research about PsA and PsO within the context of those disciplines
  • Develop and maintain current Treatment Guidelines for psoriatic arthritis
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Publications authored by GRAPPA members every year since 2005

Development of evidence-based review of psoriatic arthritis (PsA) treatments published Spring 2006 and publication of refreshed Treatment Recommendations in 2016

Participation as the PsA working group at every OMERACT meeting since 2004

Meetings held adjacent to AAD, EULAR and ACR (2004 to the present)

GRAPPA Annual Meetings at various locations around the world in 2005 to the present. See the Events tab for information on the latest Annual Meeting. A supplement covering the Annual Meeting activities has been published every year since 2006 in the Journal of Rheumatology

More than a dozen committees are pursuing a variety of research projects

Response Measure Project was completed in 2014 after participation by more than 40 centers worldwide

GRAPPA has produced video training modules to learn exams such as the PASI, NAPSI, PSSI, PGA, Palmar-Plantar, Axial Spine and others. These are available through our partner ePharma Solutions. Contact [email protected] for more information on accessing these online trainings

Celebrating 20 Years of GRAPPA!

We kicked off the 2023 Annual Meeting and Trainee Symposium today celebrating GRAPPA's 20th Anniversary! 🎉👏We've had an incredible 20 years, but we're just getting started! Thanks to all of our dedicated members and your many contributions over the years! Looking forward to more to come!

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"We are united in our leadership to bring the most passionate rheumatologists, dermatologists, clinical scientists, patient representatives, and industry partners together to make a difference for those living with psoriasis and psoriatic arthritis."

April Armstrong, MD, MPH & Oliver FitzGerald, MBBCh, BAO, MRCPI, MRCP, FRCPI, MD, - GRAPPA Co-Presidents


Be a part of something profound.

GRAPPA is an amazing network of people interested in psoriasis and PsA.

Through your involvement you can share ideas, collaborate on research and lead projects aimed to improve the lives of people living with psoriatic disease.

About Us

Originally inspired by the Assessment in Ankylosing Spondylitis Working Group (ASAS), GRAPPA was formed in 2003. GRAPPA has pulled together many different groups, including preeminent researchers and thought-leaders in psoriatic arthritis (PsA) and psoriasis (PsO).

In 2015 a team of Patient Research Partners was added to round out our perspective. The idea was to form a consortium of rheumatologists, dermatologists, radiologists, epidemiologists, patient representatives and others who would like to contribute to the field of PsA. At the inaugural meeting in 2003, a consensus exercise started the group toward prioritizing domains of inquiry in PsA and PsO.

Subsequent annual meetings have focused on identifying and initiating research projects, advancing standardized criteria for psoriatic arthritis registries, and developing treatment guidelines for PsA. GRAPPA is a 501(c)3 nonprofit organization with offices in Seattle, WA and members from around the world.

Thought Leaders

Today, more than 1,000 thought-leaders participate in GRAPPA including rheumatologists, dermatologists, radiologists, geneticists, methodologists, epidemiologists, patient research partners, and biopharmaceutical industry representatives.

International Effort

Approximately 75 percent of our members live and work outside North America; creating a truly international effort.

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We want to hear from you! Send us your questions and comments here.

Wherever the art of medicine is loved, there is also a love of humanity. Hippocrates

GRAPPA Corporate Members

Corporate members support GRAPPA's mission by contributing to ongoing operations and the multiple initiatives of our association, such as research and education.

Platinum Leaders

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Gold and Silver Leaders

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Bronze Leaders

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