Guselkumab vs Golimumab in PsA TNF Inadequate Responder Patients

Inclusion Criteria:

1. Psoriatic arthritis meeting CASPAR criteria;
2. Active psoriatic arthritis defined by at least 1 swollen joint;
3. cDAPSA score ≥ 10; See also Exclusion #4 - cDAPSA must be \> 14 in patients without psoriasis.
4. Using a TNFi or previously used a single TNFi historically and either never responded or lost response (TNF IR) and planning to switch to a new biologic therapy;
5. If using an oral small molecule/csDMARD (i.e., methotrexate, leflunomide, hydroxychloroquine, sulfasalazine, or apremilast), must be on a stable dose for 4 weeks and remain on a stable dose during the study; Use of up to two OSM/csDMARDs is allowed.
6. If using NSAIDs, glucocorticoids (\<10 mg daily) or topical medications for psoriasis, must be on a stable dose for 4 weeks prior to Screening/Baseline 1 and remain on a stable dose during the study;
7. Age 18-80 (patients older than 80 may be more likely to have concomitant osteoarthritis which may make it difficult to assess whether symptoms are related to PsA vs OA).

Exclusion Criteria:

1. Prior exposure to golimumab or another non-TNFi biologic (IL12/23i, JAKi, an IL17i, or an IL23i); prior exposure to a TYK2i is acceptable, but cannot be used during course of the study;
2. An adverse event that precludes use of another TNFi (development of drug-induced SLE, allergic reaction, serious infection, heart failure symptoms, demyelination at any point during use of therapy) or any other contraindication or substantial intolerance to a TNFi;
3. Use of moderate to high dose glucocorticoids (\>10 mg);
4. Already meets the primary endpoint at Baseline; \[cDAPSA low disease activity ≤ 14; IGA of psoriasis 0/1\] In patients with psoriasis, cDAPSA can be 10-14 IF the Investigator Global Assessment of Psoriasis ≥ 2.

   In patients without psoriasis, cDAPSA must be \> 14 to meet eligibility requirements.
5. Currently pregnant or actively trying to conceive.