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Weight Loss as a Therapeutic Goal in Psoriatic Arthritis

Antoni Chan, MD, PhD

Psoriatic arthritis (PsA) is a complex inflammatory disease often complicated by obesity, which not only worsens disease activity but also impairs treatment response. At ACR Convergence 2025, three compelling studies spanning pharmacologic, lifestyle, and longitudinal observational data converged on a central theme: weight loss is a powerful modulator of PsA outcomes, regardless of the intervention used.

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human figures on blue circle

IgG4: Rare, but new treatments on the horizon

Janet Pope, MD, MPH, FRCPC

IgG4 is a rare autoimmune disease with excessive IgG4 immunoglobulins that can affect multiple organs yielding plasma cell deposition (inflammation) and fibrosis.

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Thank you @drdavidliew & @DrLauraCoates ❤️ for highlighting our work. Super-responders (some were IS-Free) do exist with rituximab in #SLE Abstr#1525 @RheumNow https://t.co/S4mMAYInfT

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Md Yuzaiful Md Yusof Yuz6Yusof ( View Tweet)

Autologous CAR-Treg in RA, without any lymphodepletion preRx Early data from ph1, single dose Good initial response, stopped RA Rx, but some rebound Clearly work ongoing but excitement re: - CAR-Treg - RA as target dx - no lymphodepletion @minnakohlermd #ACR25 LB23 @RheumNow https://t.co/azmlFNU02R

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David Liew drdavidliew ( View Tweet)
REGULATE RA SBT-77-701 Engineered Treg cell in Refractory RA population 6patients Safety and tolerability: No DLT, CRS or ICANS Efficacy Reduction >50% in TJC and SJC 67% reduction of DAS-CRP >=2 stained up to wk 24 Impressive in pts for whom it works, yet a couple seem to https://t.co/lQAQABPhg0

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Aurelie Najm AurelieRheumo ( View Tweet)

#ACR25 Abstr#LB23 Phase 1 trial in 5 refractory #RA of SBT777101, a novel autologous CAR-Treg (without the need for lymphodepletion) showed promising efficacy and safety signal. No DLT, CRS or ICANS. Looking forward to larger data and in other RMDs @RheumNow https://t.co/YyGMSHjA3z

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Md Yuzaiful Md Yusof Yuz6Yusof ( View Tweet)
Turns out you can directly degrade NETs. Holy smokes NETs critical in pathology of SLE & other dx They’ve found you can target it Enzymatic degrader fused to albumin Proof-of-concept: degraded a patient’s SLE manifestations in hours Definitely one to watch #ACR25 LB22 @RheumNow https://t.co/HVEt8wFYmI

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David Liew drdavidliew ( View Tweet)
Microbiome signature for prediction of response to MTX in RA: Yay or Nay? Microbiome analysis 60pts, 23 MTX NR BL enrichment in specific species in MTX NR Looking at the graphs though, seems to be driven by a few pts Prediction model doesn't seem to perform greatly Sens 88% https://t.co/1yrSXdE6DG

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Aurelie Najm AurelieRheumo ( View Tweet)

Regulate-RA study, first-in-human Phase 1 study data show citrullinated protein (CitP)-targeted CAR-Tregs (SBT777101) are safe and show early efficacy in refractory RA. 67% had ≥50% joint count reduction by Week 4. A novel, non-cytotoxic approach to immune modulation for https://t.co/g153w3XVEK

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Antoni Chan MD (Prof) synovialjoints ( View Tweet)
The next VEXAS, but also maybe we can treat it? IDH1/2 Another clonal hematopoesis known to cause heme malignancy, but also some inflamm sequelae (autoinflamm-like e.g. PMR/GCA) & you can directly inhibit it Wow. We will hear more #ACR25 LB21 @RheumNow https://t.co/WL2ai5zb8Q https://t.co/Yi31xkhLO9

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David Liew drdavidliew ( View Tweet)
Ph2B RCT of Rosnilimab Tcell depleter (PD-1high Tph/Tfh, Teff) Wk 12 Primary Endpoint met Mean change DAS28-CRP at Wk 12 SC rosnilimab 100mg Q4W -2.06 400mg Q4W -2.12 600mg Q2W -2.06 PBO -1.69 >90% peripheral and synovial depletion pathogenic T cells 28 Wk Safety profile: https://t.co/XyVhJamFdp

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Aurelie Najm AurelieRheumo ( View Tweet)
POETYK PsA-1 (one of paired deucravacitinib in PsA ph3 registration studies) Oral med Good outcomes Safety very good but the bar is very high nowadays in PsA Questions splicing through depth of response Definitely will find a place in therapy, but where? #ACR25 LB19 @RheumNow https://t.co/iqmHQrMTYN

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David Liew drdavidliew ( View Tweet)
POETYK PsA 1 and 2 Deucravacitinib TYK2 inhibitor Ph3 RCT 52 wks data Deucra 336pts PBO 334pts then crossover wk 16 to 52 Pooled analysis wk 16 ACR 20 54% vs. 31% Enthesitis reduction LEI 52% vs. 45% Dactylics resolution 58% vs. 44% POETYK-PsA 1 Wk 52 ACR 20 63% ACR50 44% PASI https://t.co/LYJbU8fYwI

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Aurelie Najm AurelieRheumo ( View Tweet)
In POETYK PsA-1, deucravacitinib showed sustained efficacy through Week 52 in PsA, improving joint, skin, PROs, and radiographic progression. Safety remained favorable with no new signals. TYK2 inhibition continues to show promise. Abstract#LB20 @RheumNow #ACR25 https://t.co/sGkk062HqJ

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Antoni Chan MD (Prof) synovialjoints ( View Tweet)
Questions #ACR25 LB20 to Paul Emery on rosnilimab: Fleischmann: could be induction therapy? (Not intent, but could be) Choy: Depth of changes with translational data Tanaka: Safety given peresolimab ph2b here (diff epitope, membrane proximity, targeted depletion PD-1hi) @RheumNow

David Liew drdavidliew ( View Tweet)

Mease et al. 52 week results deucravacitinib in PsA. Approx ACR20 60%, ACR50 40%, ACR70 25%. Sustained radiographic benefit. No new safety signals @RheumNow #ACR25 Abstr#LB20 https://t.co/vKqjb08mI8

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Richard Conway RichardPAConway ( View Tweet)
PD-1 agonist as an induction therapy in refractory RA?? Rosnilimab ph2b: - still responding 3mo after Rx stopped - no difference between type of prior b/tsDMARD failure - safety here looks good *so far* A lot of cautious excitement in the room for this #ACR25 LB19 @RheumNow https://t.co/CmfPlP4g0N

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David Liew drdavidliew ( View Tweet)
A new approach in RA: Rosnilimab targets & depletes PD-1–high pathogenic T cells, acting upstream of cytokine pathways. In Ph2b, all doses improved DAS28-CRP & ACR responses vs placebo, with durable efficacy & good safety. @RheumNow #ACR25 Abstract#LB19 https://t.co/cIxi7NEu6C

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Jiha Lee JihaRheum ( View Tweet)
#ACR25 Abstr#LB19 New T-cell therapy on the block! In Phase 2b RCT of #RA (~50% b/tsDMARD-IR), Rosnilimab, PD-1 agonist met its endpoint (DAS28-CRP) at WK12. Effective despite type of previous therapy. No safety concern/malignancy/death. To proceed to Phase 3 @RheumNow #ACRBest https://t.co/MecTYMpH0o

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Md Yuzaiful Md Yusof Yuz6Yusof ( View Tweet)
Emery et al. Rosnilimab, selective T cell (PD-1high Tph/Tfh, Teff) monoclonal antibody in RA. Phase 2 RCT. 424 patients. 41% prior bDMARD. 69% CDAI LDA week 14. Week 12 ACR20 70%, ACR50 40%, ACR70 21%. @RheumNow #ACR25 Abstr#LB19 https://t.co/479q6COWvk

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Richard Conway RichardPAConway ( View Tweet)
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