Minimal Disease Activity Status Research Articles

Minimal disease activity and associated factors in patients with psoriatic arthritis: cross-sectional study from a single center

IntroductionPsoriatic arthritis (PsA) is a heterogeneous disease with various manifestations such as dactylitis, enthesitis, spondylitis, and skin involvement. Minimal disease activity (MDA) has been successfully used in daily clinical practice and is considered a reasonable treatment target in patients with PsA. In this study, we aimed to evaluate the MDA status and associated factors in patients with PsA in our tertiary referral clinic.Material and methodsThis cross-sectional study included patients who met the CASPAR classification criteria and had at least 6 months of follow-up data between 2001 and 2021. Patients who met at least 5 of 7 criteria (tender joint count ≤ 1/68, swollen joint count ≤ 1/66, Psoriasis Area Severity Index [PASI] ≤ 1, Visual Analogue Scale [VAS] ≤ 15, patient global VAS ≤ 20, Health Assessment Questionnaire-Disability Index [HAQ-DI] ≤ 0.5, and enthesitis number ≤ 1) were considered to achieve MDA.ResultsData from 172 patients (61% female) were analyzed and included in the study. While most patients had polyarticular involvement (33.7%), mono-oligoarthritis was present in 30.2%, mixed type in 26.2%, isolated distal interphalangeal arthritis in 5.8%, isolated spondylitis in 2.9%, and arthritis mutilans in 1.2%. Overall, 95 (55.2%) of the patients were observed at MDA, which was lower in tumor necrosis factor inhibitor (TNFi) users compared to only conventional synthetic disease-modifying antirheumatic drug users. In univariate analysis, MDA was associated with higher patient age, longer psoriasis duration, late-onset PsA, and continued use of first TNFi. In multivariate analysis, higher patient age, late-onset PsA, and higher continuation rate of first TNFi were associated with MDA.ConclusionsIn the study, more than half of our patients achieved MDA status. A higher MDA rate was associated with a higher continuation rate at first-line TNFi treatment. The relatively large po­pulation who could not reach MDA status in our study indicates an unmet need for monitoring and treatment of PsA.

P175 The Psoriatic Arthritis Impact of Disease 12-item questionnaire can replace other patient-reported outcome measures to facilitate disease monitoring in clinical practice

Abstract Background/Aims The Psoriatic Arthritis Impact of Disease 12-item questionnaire (PsAID-12) was developed and validated to improve assessment of disease activity from the patient’s perspective. Several patient-reported outcome measures (PROMs) are relevant to PsA but completing several questionnaires at each clinic visit creates a time and administrative burden for patients and clinicians. Furthermore, the Minimal Disease Activity (MDA) for assessing disease activity in PsA requires the Health Assessment Questionnaire (HAQ) to be collected; however, a Canadian study found that PsAID-12 can replace HAQ in the MDA using a cut-off of < 3.7. A previous study also found sex-specific differences in PsAID-12 scores, with scores being higher in females. The aim of this study was to assess whether PsAID-12 correlates well and could replace other PROMs in clinical practice, and to validate previously published findings related to the use of PsAID-12 instead of HAQ in determining MDA, and sex-specific differences in PsAID-12 scores. Methods Clinical data were collected from 75 consecutive patients attending a PsA clinic in a tertiary centre at their first review in 2023. Clinical characteristics, PROMs, examination findings, and measures of disease activity were recorded. Correlation with PsAID-12 was assessed using Spearman’s rank correlation coefficient. Sex-specific differences were assessed using Mann-Whitney U tests. Bonferroni correction was used to adjust for multiple comparisons. Results PsAID-12 scores were significantly correlated with all PROMs, and with composite measures of disease activity (DAPSA, MDA), but not with clinical measures of disease activity (TJC, SJC, PASI, BSA), or acute-phase reactants (CRP, ESR). PsAID-12 scores were not affected by age or disease duration. There was no sex-dependent difference in PsAID-12 scores; however, female patients had significantly higher HAQ and HAD scores. MDA scores using PsAID-12 correlated significantly with MDA scores using HAQ. Conclusion PsAID-12 is a suitable replacement for other PROMs in clinical practice, and for HAQ when determining MDA status to reduce the time and administrative burden on patients and clinicians, and to facilitate monitoring of disease activity in patients with PsA regardless of age or disease duration. Contrary to previous studies, there were no sex-dependent differences in PsAID-12 scores. Disclosure R.M. Hum: None. K. Hasanein: None. L.T. Hao: None. J.C. Williams: None. A. Cheung: None. A. Adhikarla: None. A. Choyce: None. A. Newton: None. C. Clegg: None. A. Barton: None. P. Ho: None.

Efficacy of risankizumab across subgroups in patients with active psoriatic arthritis: a post hoc integrated analysis of the phase 3 KEEPsAKE 1 and KEEPsAKE 2 randomized controlled trials

In the KEEPsAKE 1 (NCT03675308) and KEEPsAKE 2 (NCT03671148) phase 3 trials, risankizumab demonstrated greater efficacy compared with placebo in patients with active psoriatic arthritis (PsA). This post hoc integrated analysis evaluated achieving the following efficacy outcomes at weeks 24 and 52 by baseline demographics and clinical characteristics: ≥20%/50%/70% improvement in American College of Rheumatology response criteria (ACR20/50/70), ≥90% improvement in Psoriasis Area and Severity Index, minimal disease activity status, Low Disease Activity status (Disease Activity in Psoriatic Arthritis), and minimal clinically important difference in pain. Baseline demographics and clinical characteristics were similar between risankizumab (n = 707) and placebo (n = 700) groups. Numerically higher ACR20 response rates at week 24 (primary endpoint) were observed among the risankizumab (46.3%−60.1%) vs. placebo (15.5%−36.2%) cohorts, regardless of subgroups. At week 52, consistent proportions of patients randomized to risankizumab achieved ACR20 (48.6%−75.8%) while those initially randomized to placebo and switched to risankizumab experienced an improvement from week 24 (43.7%−63.9%), regardless of subgroups. Similar trends were observed for other efficacy measures assessing rigorous skin response criteria, composite measures of overall disease activity, and PsA-related symptoms. Risankizumab treatment was efficacious among patients with varying demographic and psoriatic disease characteristics through 52 weeks.

Risk Factors Associated with Difficult-to-treat (D2T) Psoriatic Arthritis - A One-year Analysis from the APLAR SpA Registry

Background: Despite the widespread advocacy of the treat-to-target(T2T) strategy for managing psoriatic arthritis (PsA), a significant number of patients fail to achieve minimal disease activity (MDA) even with advanced therapies. While a universal definition of difficult-to-treat(D2T) PsA is absent, investigating the heterogeneity of D2T PsA within a real-life T2T-cohort can offer valuable insights into comprehending this concept. Methods: This analysis included the first 111 PsA patients enrolled in the APLAR SpA registry who underwent 1-year T2T management. They were recruited from 6 Asia-Pacific regions. D2T was defined as the failure to achieve MDA despite receiving [Formula: see text]1 conventional synthetic disease-modifying anti-rheumatic drugs(csDMARDs) and [Formula: see text]1 biologic/targeted synthetic DMARDs(b/tsDMARDs) over 6-months. Results: A total of 111 patients (mean age: 48± 13 years, 59 [53%] male, mean disease duration: 5.3± 7.3 years) were included. At baseline, the patients exhibited moderate disease activity, with only 35% achieving MDA. After 1-year, a significant improvement in Disease Activity in Psoriatic Arthritis (DAPSA) was observed (16.3± 14.0 at baseline vs 10.1± 9.7 at 1-year, p<0.001), with 56% of patients achieving MDA. At one-year, 17(15%) patients fulfilled the definition of D2T-PsA. Compared to the non-D2T group, patients in the D2T group had lower education level, longer disease duration, worse disease activity across domains, and higher functional disability at baseline (Table 1). During the 1-year treatment, the T2T adherence rate was significantly lower in the D2T group (71% vs 90%, p=0.028). Reasons for not escalating treatment in the D2T group included patients’ preference (60%), physician’s decision (20%), and no alternative treatment available (20%). Using multivariate logistic regression, a lower education level (OR:4.64, 95%CI:1.16-16.9, p=0.029) and higher Ankylosing Spondylitis Disease Activity Score (ASDAS) (OR: 1.81, 95%CI:1.07-3.04, p=0.026) were significantly associated with D2T after adjusting for baseline disease duration, number of dactylitic digits, MDA status and protocol adherence. Conclusions: Despite the implementation of the T2T-strategy and increased utilization of b/tsDMARDs, more than 40% of patients were unable to achieve MDA. Factors such as higher axial disease activity and lower education level were associated with D2T PsA. Further studies are required to determine whether a more aggressive treatment approach focusing on the axial domain should be implemented for these individuals.

Disease Profile and Achievement of Therapeutic Goals in a Modern, Nationwide Cohort of 923 Patients with Psoriatic Arthritis.

Psoriatic arthritis (PsA) is a heterogenous chronic inflammatory disease affecting skin, joints, entheses, and spine with various extra-musculoskeletal manifestations and comorbidities. The reported patient, disease and treatment characteristics in the modern therapeutic era are limited. In this cross-sectional, multi-centre, nationwide study, we recorded the demographic, clinical, and therapeutic characteristics as well as the comorbidities of patients with PsA seen for 1 year (1/1/2022-31/12/2022). 923 patients (55% females) with a median (IQR) age of 57 (48-65) years and a mean disease duration of 9.5 years were enrolled. Family history of psoriasis and PsA was noted in 28.3% and 6.3%, respectively. Most patients had limited psoriasis (BSA<3: 83%) while enthesitis, dactylitis, nail and axial involvement reported in 48.3%, 33.2%, 43% and 25.9% of patients, respectively. Regarding comorbidities, approximately half of patients had dyslipidaemia (42%) or hypertension (45.4%), 36.8% were obese and 17% had diabetes while 22.7% had a depressive disorder. Overall, 60.1% received biologics and among them more patients treated with anti-IL-17 or -12/23 agents were on monotherapy (64.2%) compared to those on TNFi monotherapy (49.4%, p=0.0001). The median PsA activity as assessed by the DAPSA score was 6 (IQR: 2.3 - 13.1) with 46% of patients reaching minimal disease activity status (MDA). In this large, real life, modern cohort of patients with PsA with frequent comorbidities who were treated mainly with biologics, almost half achieved minimal disease activity. These results show the value of existing therapeutic approaches while at the same time highlight the existing unmet needs.

The Psoriatic Arthritis 5-Thermometer Scales (PsA-5Ts): Measurement Properties of a New Multidimensional Composite Tool for the Quick Assessment of the Overall Health Status in Psoriatic Arthritis.

Psoriatic arthritis (PsA) is a heterogeneous condition that is difficult to assess. The goal of this research was to evaluate the clinimetric properties of the Psoriatic Arthritis 5-Thermometer Scales (PsA-5Ts), a new patient-reported outcome (PRO) to measure the overall health status in PsA patients. The PsA-5Ts were compared to composite measures of disease activity (DAPSA, PASDAS, CPDAI) and PROs (PsAID-12 and SF-36). The convergent validity was assessed through the Spearman's correlation coefficient and the discriminant validity through the receiver operating characteristic (ROC) curve analysis, applying the Minimal Disease Activity (MDA) as an external criterion. The cross-sectional assessment included 155 patients. Significant high correlations were observed when comparing PsA-5Ts to composite indices of disease activity and PROs (all at significance levels of p < 0.0001). The PsA-5Ts subscales were highly significantly different in terms of MDA status (all at p < 0.0001). The PsA-5Ts had good discriminant validity like that of the DAPSA, CPDAI, PASDAS, and PsAID-12, and better than that of the SF-36, with an area under the ROC curve of 0.944 (65% CI 0.895-0.974). The PsA-5Ts are an easy-to-use PRO that can be integrated with disease activity indices in the assessment of PsA in daily clinical practice.

Disease control in patients with psoriatic arthritis in real clinical practice in Spain: MiDAS study

ObjectiveMiDAS study assessed the percentage of psoriatic arthritis (PsA) patients treated in routine clinical practice who achieved control of disease activity according to Disease Activity in Psoriatic Arthritis (DAPSA) and Minimal Disease Activity (MDA). MethodsObservational, non-interventional, cross-sectional, multicenter study conducted under conditions of routine clinical practice in 36 centers with outpatient rheumatology clinics in Spanish public hospitals. Patients included were adults (≥18 years) with ≥6 months PsA diagnosis according to classification for PsA (CASPAR) criteria and undergoing treatment ≥3 months. The main variable evaluated was the percentage of patients under remission and low disease activity, assessed through DAPSA and MDA. Results313 patients with PsA were included: 54.3% male; with mean age of 54.1±12.2 years and mean disease duration of 10.5±9.0 years. Mean C-reactive protein (CRP) serum levels were 4.9±7.3mg/L. At the study visit, 58.5% of patients were in monotherapy (17.6% biological and 40.9% non-biological) and 41.2% were receiving biological and non-biological therapy.59.4% of patients showed low disease activity (DAPSA≤14) and 19.8% were on remission (DAPSA≤4). Moreover, 51.4% of the patients reached an MDA status (≥5 MDA). ConclusionsAround 40% of PsA patients presented uncontrolled disease, highlighting the need to improve the management of these patients in clinical practice.

Interval prolongation of etanercept in rheumatoid arthritis, ankylosing spondylitis, and psoriatic arthritis: a randomized controlled trial

Objective The majority of patients with a rheumatic disease treated with etanercept may be overexposed. Data regarding etanercept tapering are scarce, particularly in psoriatic arthritis (PsA) and ankylosing spondylitis (AS). We compared extending the dose interval to continuation of the standard dose and studied the success rate of etanercept discontinuation. Etanercept concentrations were measured throughout the study. Method 160 patients with rheumatoid arthritis (RA), PsA, or AS with sustained minimal disease activity (MDA) were enrolled in this 18-month, open-label, randomized controlled trial. The intervention group doubled the dosing interval at baseline and discontinued etanercept 6 months later. The control group continued the standard dose for 6 months and doubled the dosing-interval thereafter. The primary outcome was the proportion of patients maintaining MDA at 6 month follow-up. Results At 6 months, MDA status was maintained in 47 patients (63%) in the intervention group and 56 (74%) in the control group (p = 0.15), with comparable results in all rheumatic diseases. And median etanercept concentrations decreased from 1.50 µg/mL (interquartile range 1.06– 2.65) to 0.46 µg/mL (0.28–0.92). In total, 40% discontinued etanercept successfully with maintained MDA for at least 6 months. Conclusion Etanercept tapering can be done without losing efficacy in RA, PsA, and AS patients in sustained MDA. A substantial proportion of patients could stop etanercept for at least 6 months. In many patients, low drug concentrations proved sufficient to control disease activity. However, the risk of minor and major flares is substantial, even in patients continuing standard dosing.

Implementation of the Treat-to-Target Concept in Evaluation of Psoriatic Arthritis Patients.

Background: The treat-to-target approach was recently adopted for psoriatic arthritis (PsA) management. Objective: To assess the implementation of the “treat-to-target” (T2T) concept in daily management of PsA by use of composite scores of disease activity versus clinical judgement alone. Methods: A total of 117 PsA patients from a longitudinal PsA cohort were enrolled consecutively in the study during each patient’s first clinic visit during 2016–2017. Clinic notes from the treating rheumatologist were reviewed by an independent rheumatologist, noting clinical impression of disease activity, treatment changes based on clinical judgement, and rationale. Treatment changes were then compared to the use of formal disease activity parameters in Minimal Disease Activity (MDA) and Disease Activity Index for Psoriatic Arthritis (DAPSA) composite measures. All associations were assessed using the chi-square test or the Mann–Whitney test, as appropriate. Results: The 117 PsA patient cohort consisted of 65.5% women, mean age 58.4 ± 13.6 years. Clinical judgement of treating rheumatologist concorded with MDA and DAPSA in 76 (65.5%) and 74 (64.9%) patients, respectively. Agreement between clinical judgement and composite measure criteria did not correlate with patient age, sex, alcohol/tobacco use, or treatment regimens chosen. Disagreement between physician assessment and MDA occurred in 40 (34.5%) cases: in 30 cases, the MDA status was overestimated due to disregard of patient reported outcomes (PRO), while underestimation of MDA status occurred in 25% of cases with treatment changes made in patients with a single active joint or enthesis. Underestimation of disease activity using DAPSA occurred in 22 cases and could be attributed to disregarding tender joint count, patient pain visual analogue scale and C-reactive protein level. Conclusion: In our cohort, agreement between clinical impression and formal composite measure utilization for implementation of T2T strategy occurred in 65% of patients. Discordance resulted from physicians’ overlooking PRO and emphasizing objective findings when using clinical judgement alone.

OP0209 INTERVAL PROLONGATION IN ETANERCEPT-TREATED PATIENTS WITH RHEUMATOID ARTHRITIS, ANKYLOSING SPONDYLITIS OR PSORIATIC ARTHRITIS: AN OPEN-LABEL, RANDOMISED CONTROLLED TRIAL

Background:The majority of patients with a rheumatic disease treated with etanercept may be overexposed. Data regarding etanercept tapering is scarce, particularly in psoriatic arthritis (PsA) and ankylosing spondylitis (AS). Dose reductions can potentially reduce blood drug levels too much, resulting in loss of effect.Objectives:We compared extending the dose interval to continuation of the standard dose and studied the success rate of etanercept discontinuation. Etanercept concentrations were measured throughout the study.Methods:160 consecutive patients with rheumatoid arthritis (RA), PsA or AS with sustained minimal disease activity (MDA) were enrolled in this 18-month, open-label, randomised controlled trial. The intervention group doubled the dosing-interval at baseline and discontinued etanercept 6 months later. The control group continued the standard dose up to 6 months, after which the dosing-interval was doubled. Primary outcome was the proportion of patients maintaining MDA after 6 months follow-up.Results:At 6 months, MDA status was maintained in 47 (63%) patients in the intervention group and 56 (74%) in the control group (p=0.15), with comparable results in all rheumatic diseases. Median etanercept concentrations decreased from 1.50 µg/mL (25-75thpercentile 1.06-2.65) to 0.46 µg/mL (0.28-0.92) after 6 months of interval prolongation (figure 1). In total, 40% discontinued etanercept successfully with maintained MDA for at least 6 months.Figure 1.Median (with Q1 to Q3 boxplots) etanercept concentrations (per protocol) during the first 6 months of follow-up in the intervention group (prolongation; gray boxplots) and the control group (continuation; white boxplots), separated by disease (RA, PsA, AS). Bars represent 10-90 percentile and outliers are shown separately (dots).Conclusion:As observed in RA, etanercept tapering can be safely attempted in PsA and AS patients in sustained MDA. A substantial proportion of patients could stop etanercept for at least 6 months. In many patients low drug concentrations proved sufficient to control disease activity. However, the risk of minor and major flares is substantial, even in patients continuing standard dosing.

Minimal disease activity is a stable measure of therapeutic response in psoriatic arthritis patients receiving treatment with adalimumab.

ObjectiveThe aim of this study was to evaluate minimal disease activity (MDA) assessments in patients with PsA during routine clinical care.MethodsWe used data from a multicentre observational study of patients with active PsA who initiated treatment with adalimumab during routine clinical practice and continued treatment for at least 6 months to evaluate achievement of MDA, individual MDA criteria (modified to conform to study assessments) and ACR responses during 24 months of therapy. Pearson correlation coefficients were used to evaluate the association between MDA and individual criteria at month 6; regression models were used to determine the influence of baseline MDA criteria on achievement of MDA at month 6.ResultsA total of 1684 patients were included in these analyses; most had long-standing disease. MDA was achieved by 597 patients (35.5%) at month 6. This proportion increased to 45.5% at month 24 in patients remaining on therapy. MDA status was stable over time; >75% of patients with MDA at month 6 recorded MDA at subsequent visits. Pain was the most difficult individual criterion to achieve, and enthesitis was the least difficult. Higher functional status and fewer tender joints at baseline predicted achievement of MDA at month 6. About half of patients (51.5%) with an ACR20 response at month 6 achieved MDA.ConclusionIn this observational cohort of patients with long-standing disease, MDA provided a stable and valid assessment of clinical status over 24 months.Trial registrationClinicaltrials.gov, https://clinicaltrials.gov, NCT01111240

Clinical Features of Psoriatic Arthritis: a Comprehensive Review of Unmet Clinical Needs

Psoriatic arthritis (PsA) is a form of inflammatory arthritis (IA) affecting approximately 0.25% of the population. It is a heterogeneous disorder associated with joint damage, disability, disfiguring skin disease and in severe cases, premature mortality. Inherently irreversible and frequently progressive, the process of joint damage begins at, or before, the clinical onset of disease. Early recognition and intervention is thus crucial to patient outcome. At disease onset, however, PsA often resembles other forms of arthritis-especially rheumatoid arthritis (RA). Despite the similarities between PsA and RA, their distinctive pathologies require different treatments. For example, drugs that are effective in RA may not be effective in PsA and can even cause adverse effects. Since there is no currently validated test for PsA, the diagnosis is often missed or delayed and this has functional consequences for the patient. In the context of PsA and RA, making an accurate diagnosis is not the only challenge faced by rheumatologists. Choosing an effective and safe medication to manage the disease is another significant challenge and currently approximately 40% achieve meaningful responses such as minimal disease activity status. For the patient, several months may be lost as a result of trial and error testing-meanwhile, irreversible joint damage may occur. Clearly, more effective clinical tests are urgently needed to improve personalised patient care in PsA. Specifically, there is need to develop minimally invasive tests predictive of diagnosis, response to treatment and radiographic progression. In this review, we examined the biomarker development process, highlighted the importance of qualifying unmet clinical needs and emphasised the challenges that impede biomarker studies. We have compiled a comprehensive list of potentially clinically relevant biomarkers in PsA and provided a summary of proteomic technologies that might usefully support additional biomarker research in PsA.

Prediction and benefits of minimal disease activity in patients with psoriatic arthritis and active skin disease in the ADEPT trial

ObjectivesTo determine the proportion of patients with psoriatic arthritis in the Adalimumab Effectiveness in Psoriatic Arthritis trial achieving minimal disease activity (MDA) and its individual components at 1 or more...

On Modelling Minimal Disease Activity

ObjectiveTo explore methods for statistical modelling of minimal disease activity (MDA) based on data from intermittent clinic visits.MethodsThe analysis was based on a 2‐state model. Comparisons were made between analyses based on “complete case” data from visits at which MDA status was known, and the use of hidden model methodology that incorporated information from visits at which only some MDA defining criteria could be established. Analyses were based on an observational psoriatic arthritis cohort.ResultsWith data from 856 patients and 7,024 clinic visits, analysis was based on virtually all visits, although only 62.6% provided enough information to determine MDA status. Estimated mean times for an episode of MDA varied from 4.18 years to 3.10 years, with smaller estimates derived from the hidden 2‐state model analysis. Over a 10‐year period, the estimated expected times spent in MDA episodes of longer than 1 year was 3.90 to 4.22, and the probability of having such an MDA episode was estimated to be 0.85 to 0.91, with longer times and greater probabilities seen with the hidden 2‐state model analysis.ConclusionA 2‐state model provides a useful framework for the analysis of MDA. Use of data from visits at which MDA status can not be determined provide more precision, and notable differences are seen in estimated quantities related to MDA episodes based on complete case and hidden 2‐state model analyses. The possibility of bias, as well as loss of precision, should be recognized when complete case analyses are used.

AB0454 EULAR-DAS28 versus RAPID3 for treatment monitoring in patients with rheumatoid arthritis receiving tnf inhibitors

Backgroundtreat-to-target and tight control strategies are actually the two main paradigms in the treatment of rheumatoid arthritis (RA), aiming to improve patients outcome by achieving either remission or minimal disease...

THU0102 EULAR-DAS28 versus RAPID3 for treatment monitoring in patients with rheumatoid arthritis treated with rituximab

Backgroundtreat-to-target and tight control strategies are actually the two main paradigms in the treatment of rheumatoid arthritis (RA), aiming to improve patients outcome by achieving either remission or minimal disease...

Minimal disease activity, remission, and the long‐term outcomes of rheumatoid arthritis

To determine the prevalence of minimal disease activity (MDA) and remission in patients with rheumatoid arthritis (RA), to assess the effect of anti-tumor necrosis factor (anti-TNF) therapy on MDA, and to determine the extent to which MDA status improves long-term outcomes. Using the Patient Activity Scale (PAS) as a surrogate, we assessed the prevalence of MDA and remission in 18,062 patients with RA using the newly developed Outcome Measures in Rheumatology Clinical Trials (OMERACT) criteria for MDA. MDA was noted in 20.2% of 18,062 patients and persistent MDA, operationally defined as having MDA during >or=2 consecutive 6-month observation periods, occurred in 13.5% of 7,433 patients followed longitudinally. Disease activity at remission levels was noted in 7%. Among patients with MDA, 82% received disease-modifying antirheumatic drugs or biologic agents. Following anti-TNF initiation, the cumulative probability of achieving MDA at 2 and 6 years was 4.1% and 7.6%, respectively, and persistent MDA probabilities were 2.7% and 4.5%, respectively. Regardless of RA duration, patients with MDA had substantially better outcomes, including a 10-fold reduction in work disability and an approximately 2-fold reduction in total joint replacement and mortality. Remission remains uncommon in RA, and the prevalence of new remission in community practice is substantially lower than noted in published trials of biologic therapy. On average, persons with MDA appear to have persistently mild RA. This might be the effect of milder RA and/or more effective treatment in early RA. The PAS had satisfactory levels of agreement with the full MDA criteria and appears suitable for use in clinical and epidemiologic research.