Vinod Chandran, MBBS, MD, DM, PhD
In almost 80% of cases, cutaneous psoriasis predates the onset of arthritic psoriasis. Therefore, identifying risk factors for the development of psoriatic arthritis (PsA) in patients with skin psoriasis is of significant clinical and research interest. One such risk factor that has previous been described is the severity of psoriasis. In a prospective population-based cohort study performed within The Health Improvement Network in the UK, Ogdie et al demonstrated that in a cohort of 8881 patients aged 25–60 years with a code for psoriasis randomly selected between 2008 and 2011, the extent of psoriasis as measured by the body surface area affected (BSA) was a strong predictor of developing PsA. Comorbidities, such as obesity and depression, were additive risk factors. In this cohort, after a mean follow-up time of 4.2 years (SD 2.1), the incidence of PsA was 5.4 cases per 1000 person-years. After adjusting for age and sex, BSA > 10% [hazard ratio (HR) 2.01, 95% CI 1.29, 3.13], BSA 3–10% (HR 1.44, 95% CI 1.02, 2.03), obesity (HR 1.64, 95% CI 1.19, 2.26) and depression (HR 1.68, 95% CI 1.21, 2.33) were associated with incident PsA. Thus, patients with these risk factors should be carefully evaluated at each visit for signs of PsA.
One important question is whether treatment of psoriasis with targeted therapies reduces the risk of incident PsA. In a retrospective cohort study using the electronic medical records of the Maccabi Healthcare Services in Israel, Rosenthal et al , using propensity score matching compared patients who had received biological treatment for psoriasis and were not diagnosed with PsA before or at the time of biologic treatment initiation to controls not on such treatment. Patients were matched by age at diagnosis, gender, time until treatment initiation, maximum body mass index (BMI), and smoking. Multivariable Cox regression analysis showed that the control group had a significantly higher risk for PsA compared to patients treated with biologics (adjusted HR 1.39; 95%CI 1.03-1.87). Thus, there is increasing evidence that biologic therapy may decrease the risk of developing PsA.
Management of comorbidities remain an ongoing challenge in the management of psoriatic disease. In a cross-sectional multi-center study conducted by the Turkish League Against Rheumatism involving 1033 patients with PsA, 383 (37.1%) of whom were obese, Gok et al report that obesity was significantly associated with higher disease activity, lower quality of life scores, anxiety, depression, and fatigue. Comorbidities including obesity must be addressed for holistic management of PsA.
But counseling about modifiable risk factors remains low. Taylor et al reported that counseling or education for modifiable lifestyle risk factors were rare during psoriatic disease outpatient visits. Using data from the National Ambulatory Medical Care Survey (2002-2016) and the National Hospital Ambulatory Medical Care Survey (2002-2011) conducted in the United States, they demonstrate low rates of counseling for any modifiable lifestyle risk factor (11.1%; 95% CI 7.9%-15.3%), tobacco (4.8%; 95% CI 2.8%-8.0%), and obesity (2.8%; 95% CI 1.7%-4.5%). Thus, in addition to counseling about medications, an effort must be made to counsel about modifiable risk factors and comorbidities to improve quality of life of patients with psoriatic disease.
References
Ogdie A, Shin DB, Love TJ, Gelfand JM. Body surface area affected by psoriasis and the risk for psoriatic arthritis: a prospective population-based cohort study. Rheumatology (Oxf). 2021:Sep 11:keab622 (in press). doi: 10.1093/rheumatology/keab622 PMID: 34508558.
Shalev Rosenthal Y, Schwartz N, Sagy I, Pavlovsky L. Psoriatic arthritis incidence among patients receiving biologic medications for psoriasis: A nested case control study. Arthritis Rheumatol . 2021:Aug 23. doi: 10.1002/art.41946. Epub ahead of print. PMID: 34423909.
Shalev Rosenthal Y, Schwartz N, Sagy I, Pavlovsky L. Psoriatic arthritis incidence among patients receiving biologic medications for psoriasis: A nested case control study. Arthritis Rheumatol . 2021:Aug 23. doi: 10.1002/art.41946. Epub ahead of print. PMID: 34423909.
Gok K, Nas K, Tekeoglu I, Sunar I, Keskin Y, Kilic E, Sargin B, Acer Kasman S, Alkan H, Sahin N, Cengiz G, Cuzdan N, Albayrak Gezer İ, Keskin D, Mulkoglu C, Resorlu H, Bal A, Duruoz MT, Kucukakkas O, Yurdakul OV, Alkan Melikoglu M, Aydin Y, Ayhan FF, Bodur H, Calis M, Capkin E, Devrimsel G, Ecesoy H, Hizmetli S, Kamanli A, Kutluk O, Sen N, Sendur OF, Tolu S, Toprak M, Tuncer T. Impact of obesity on quality of life, psychological status, and disease activity in psoriatic arthritis: a multi ‑center study. Rheumatol Int . 2021:Aug 28. doi: 10.1007/s00296-021-04971-8. Epub ahead of print. PMID: 34453579.
Taylor MT, Keller M, Barbieri JS. Lifestyle risk factor counseling at visits for psoriasis and psoriatic arthritis in the United States . J Am Acad Dermatol . 2021:Aug 25:S0190-9622(21)02376-8. doi: 10.1016/j.jaad.2021.08.034. Epub ahead of print. PMID: 34450204