Study points to barriers to biologic treatments for some patients with psoriasis

Psoriasis is a common chronic inflammatory disorder, primarily of the skin. In the past decade, several targeted biologic therapies have been approved for the treatment of moderate to severe psoriasis, greatly increasing the therapeutic options for this skin disorder that has no cure. Yet most psoriasis patients remain inadequately treated or unsatisfied with their therapies. Despite being effective treatments for psoriasis, access to biologics, which are given by injection or intravenous infusion, remains a challenge for many patients due to various factors including limited insurance coverage and high out-of-pocket costs.

"Previous studies have shown that psoriasis is associated with major physical and psychosocial health burdens that increase proportionally with more severe disease," lead author Junko Takeshita, MD, PhD, a dermatologist at Penn Medicine, said. "Although the biologics are generally regarded as being highly effective treatments for patients with moderate or severe psoriasis, our results suggest that out-of-pocket costs and race may impact who receives these treatments."

Using data from a nationally representative sample of Medicare beneficiaries in 2011 to identify patients with psoriasis, the researchers aimed to identify the prevalence of psoriasis among Medicare beneficiaries who are actively receiving medical care, examine their clinical characteristics, and determine the prevalence of psoriasis therapies, specifically focusing on identifying factors that may make it more or less likely for a patient to receive biologic medications.

Among the population studied, 71 percent were considered to have mild psoriasis, while 27 percent had moderate to severe psoriasis, based on treatment modality. Of the total population with psoriasis, only 10 percent were receiving biologics. Additional results showed that Medicare beneficiaries without LIS are 70 percent less likely to receive biologic treatment for their condition than those with LIS. Similarly, black patients are roughly 70 percent less likely to receive these treatments than white beneficiaries. These findings are consistent with similar studies examining use of biologic therapies among patients with rheumatoid arthritis, but the authors say further studies are necessary to better understand why the disparities exist.

"Our study is the first to identify such potential barriers among Medicare patients with psoriasis," senior author Jalpa A. Doshi, PhD, associate professor of Medicine at the Perelman School of Medicine, said. "Future studies are needed to determine if these barriers exist among psoriasis patients with Medicaid or private insurance. Additionally, further study should focus specifically on identifying the causes of such barriers, whether they are patient-centric variables such as treatment preferences and varying levels of understanding the disease, or physician factors including the frequency with which certain treatments are being offered."

Using the same representative sample of Medicare beneficiaries from 2011, the Penn team also measured the claims-based prevalence of psoriasis among this elderly and disabled population using medical claims. In Medicare recipients, the prevalence of medical claims for psoriasis ranged from 0.51 percent to 1.23 percent, depending on criteria used to identify the disease. However, according to the National Psoriasis Foundation, approximately 7.5 million Americans are affected by psoriasis, a prevalence rate of two percent to four percent. The authors say the apparent difference in psoriasis prevalence between the elderly in this study and the broader population should be interpreted with caution since Medicare claims only count those patients who are seeking medical care for their psoriasis. Nevertheless the finding is intriguing and should be explored further.