In the Medical Letter article on ustekinumab (Stelara) for psoriasis (2010; 52:7), footnote 2 in table 2 should have included a second sentence: $5595.60 is the cost of one 45-mg syringe.

The FDA has approved the interleukin (IL)-23 antagonist risankizumab-rzaa (Skyrizi – Abbvie) for treatment of moderate to severe plaque psoriasis in adults. Risankizumab is the third IL-23 antagonist to be approved for this indication; guselkumab (Tremfya) and tildrakizumab (Ilumya) were approved earlier.

View the Comparison Table: Some Drugs for Plaque Psoriasis

Some tumor necrosis factor (TNF) inhibitors are being promoted on the internet directly to the public for use in psoriasis (www.yahoo.com).

Rituximab (Rituxan - Genentech), an anti-CD20 monoclonal antibody already marketed for treatment of B-cell non-Hodgkin's lymphoma, is now FDA-approved for use concurrently with methotrexate to treat moderate to severe rheumatoid arthritis in patients who have had an inadequate response to one or more tumor necrosis factor (TNF) inhibitors. Rituximab selectively depletes CD20+ B cells, which apparently play a role in the autoimmune response and in the chronic synovitis associated with rheumatoid arthritis.

Psoriatic arthritis is a chronic inflammatory arthropathy associated with psoriasis. A recent review found that about 20% of patients with psoriasis have psoriatic arthritis. Updated guidelines for treatment of psoriatic arthritis have recently been published.

Rheumatoid arthritis (RA) is prevalent in 0.5% of adults in the US; it is about 2.5 times more common in women than in men. Guidelines for treatment of RA from the American College of Rheumatology were recently updated. The goal of treatment is to minimize disease activity and prevent irreversible joint damage.

Mild to moderate plaque psoriasis can be treated with topical drugs and phototherapy. Patients with moderate to severe disease generally require systemic therapy. Guidelines for the treatment of psoriasis with topical therapy, phototherapy, and systemic drugs have recently been published.

Tuberculosis (TB) is still a common cause of death worldwide, and the prevalence of drug-resistant TB poses challenges to its treatment and control. Guidelines with detailed management recommendations are available from the American Thoracic Society, Centers for Disease Control and Prevention (CDC) and Infectious Diseases Society of America (IDSA).