CRP and psoriatic arthritis: Studies of drug effects on PsA have used DAS28-CRP outcomes in approximately one-tenth of the published studies, as identified through a search of the PubMed database on April 26, 2023, at https://pubmed.ncbi.nlm.nih.gov for “(((((psoriatic arthritis) AND (clinic* or patient)) AND (drug or pharmacological*)) AND (therapy)) NOT (review[publication type])”, which provided 3,450 hits, while adding DAS28 as “AND (DAS28-CRP OR das28* OR (das 28) OR das-28 OR Disease Activity Score 28))” yielded 280 hits.