THU0198 EFFICACY AND SAFETY OF FILGOTINIB FOR PATIENTS WITH RHEUMATOID ARTHRITIS WITH INADEQUATE RESPONSE TO METHOTREXATE: FINCH 1 52-WEEK RESULTS

JAK-STAT signaling in inflammation and stress-related diseases: implications for therapeutic interventions

The Janus kinase-signal transducer and transcription activator pathway (JAK-STAT) serves as a cornerstone in cellular signaling, regulating physiological and pathological processes such as inflammation and stress. Dysregulation in this pathway can lead to severe immunodeficiencies and malignancies, and its role extends to neurotransduction and pro-inflammatory signaling mechanisms. Although JAK inhibitors (Jakinibs) have successfully treated immunological and inflammatory disorders, their application has generally been limited to diseases with similar pathogenic features. Despite the modest expression of JAK-STAT in the CNS, it is crucial for functions in the cortex, hippocampus, and cerebellum, making it relevant in conditions like Parkinson's disease and other neuroinflammatory disorders. Furthermore, the influence of the pathway on serotonin receptors and phospholipase C has implications for stress and mood disorders. This review expands the understanding of JAK-STAT, moving beyond traditional immunological contexts to explore its role in stress-related disorders and CNS function. Recent findings, such as the effectiveness of Jakinibs in chronic conditions such as rheumatoid arthritis, expand their therapeutic applicability. Advances in isoform-specific inhibitors, including filgotinib and upadacitinib, promise greater specificity with fewer off-target effects. Combination therapies, involving Jakinibs and monoclonal antibodies, aiming to enhance therapeutic specificity and efficacy also give great hope. Overall, this review bridges the gap between basic science and clinical application, elucidating the complex influence of the JAK-STAT pathway on human health and guiding future interventions.

Safety and Efficacy of Filgotinib for Japanese Patients with RA and Inadequate Response to MTX: FINCH 1 52-Week Results and FINCH 4 48-Week Results

OBJECTIVE

To present safety and efficacy of the JAK1 preferential inhibitor filgotinib in Japanese patients with prior inadequate response (IR) to methotrexate (MTX) from a 52-week randomised controlled parent study (PS) and long-term extension (LTE) through June 2020.

METHODS

The PS (NCT02889796) randomised MTX-IR patients to filgotinib 200 (FIL200) or 100 mg (FIL100), adalimumab (ADA) 40 mg, or placebo; all took stable background MTX. At week (W) 24, placebo patients were rerandomised to FIL200 or FIL100. The primary endpoint was W12 American College of Rheumatology 20% improvement (ACR20); safety was assessed by adverse event (AE) reporting. For the LTE (NCT03025308), eligible filgotinib patients continued FIL200/FIL100; ADA patients were rerandomised (blinded) to FIL200 or FIL100; all continued MTX.

RESULTS

114/147 Japanese patients completed the PS; 115 enrolled in LTE; 103 remained on study in June 2020. In the PS, AEs were consistent with the overall population, and W24 efficacy was maintained or improved through W52, comparable with the overall population. LTE AE incidences were similar between doses; filgotinib efficacy was consistent from baseline to W48 and similar between PS ADA and filgotinib patients.

CONCLUSION

Among MTX-IR Japanese patients, filgotinib maintained efficacy over 1 year; LTE safety was consistent with the PS.

Real-world single-centre experience of rheumatoid arthritis patients requiring four or more higher cost drugs: response and duration of treatment

The cost-effectiveness of higher cost drugs (HCDs) after several failures is disputed by some purchasers of services for people with rheumatoid arthritis (RA). We were interested to explore our service experience of using HCDs beyond the third choice to document response rates and duration of treatments.

METHOD

Records from our multi-disciplinary team meeting (MDT) that is used to decide on the use of HCDs were used to identify all RA patients who had been exposed to four or more HCDs. Notes were scrutinised for sequence of treatments, duration and response to treatments and reasons for stopping at each choice point.

RESULTS

From a total of 2648 RA patients in our service, 49 (< 2%) had been exposed to four or more HCDs. Response rates based on descriptive assessments for fourth to sixth choices were between 50 and 55% as well as some partial responders. There were responders and failures to all drugs at every choice point. Patients who had responded to one drug were more likely to respond to the next. Patients often responded to drugs for approximately 2 years. Only four patients had stopped looking for the next HCD.

CONCLUSION

Patients often respond to late choice HCDs. There are responders and failures at each time point and they are difficult to predict. There is no justification for restricting the number of HCDs that can be tried for RA. Key Points • Less than 2% of our RA patients required 4 or more higher cost drugs. • Fourth to sixth choice drugs still worked in 50 to 55% of patients. • There is no justification for CCGs restricting the number of drugs that can be tried.

Phase III trials of JAK1 selective inhibitors in rheumatoid arthritis

Upadacitinib and filgotinib, two JAK1 selective drugs have undergone extensive phase III clinical trials in RA and have demonstrated rapid improvements in disease activity, function and patient reported outcomes. Six global phase III randomized controlled clinical trials (SELECT phase III program) evaluated the efficacy and safety of upadacitinib and four clinical phase III trials (the FINCH program) evaluated the efficacy and safety of filgotinib. This article is a critical review of all these studies with focus on the therapeutic efficacy in RA. The aim is to display the data that could allow the approval of these new drugs for the treatment of RA (upadacitinib has been already approved in most of the markets around the world).

Current and Emerging DMARDs for the Treatment of Rheumatoid Arthritis

Rheumatoid arthritis (RA) is the most prevalent form of inflammatory arthritis. It is a profoundly serious and severe disease that if it goes untreated could have severe consequences to the joints and health of the patient who carries this diagnosis. The treatment of RA has dramatically changed since the year 2000, with the discovery of the TNFis, then other biologics, and finally the JAKi. All these new medications with or without methotrexate in combination, tight control and treat to target have produced a revolution in the outcome of this disease. We reviewed and summarized the treatment options, and the most significant papers for each one of these new drugs. The reader could have a full picture with all the references of the recent publications. We also updated the biosimilar situation in RA, as well as the new drugs that will be coming to the market in the next 5 years.