Tofacitinib, an oral Janus kinase (JAK) inhibitor, is part of a new class of medicines in development for the treatment of moderate-to-severe plaque psoriasis. Top-line results from OPT Retreatment were previously announced in October 2013, and the detailed results of this study were shown today in an oral presentation during the 11th European Academy of Dermatology and Venereology (EADV) Spring Symposium in Belgrade, Serbia.OPT Retreatment was a Phase 3 randomized, double-blind, three-period, parallel group, placebo-controlled 56-week study. This study evaluated the efficacy and safety of the withdrawal and retreatment with tofacitinib 5 mg and 10 mg twice daily compared to placebo in 674 adult patients with moderate-to-severe chronic plaque psoriasis. During the first period (24 weeks), which was a secondary endpoint of this study, patients were treated with either tofacitinib at a dose of 5 mg or 10 mg twice daily in a blinded manner. During this initial 24 weeks of treatment:
- 44% and 68% of patients who received tofacitinib 5 mg and 10 mg twice daily achieved at least a 75% reduction in the Psoriasis Area and Severity Index (PASI75), respectively, and
- 42% and 63% of patients who received tofacitinib 5 mg and 10 mg twice daily achieved a PGA response of “clear” or “almost clear” skin, respectively.
- A statistically significantly greater proportion of patients who remained on both doses of tofacitinib maintained PASI75 and PGA responses relative to patients who were switched to placebo, and
- No patients experienced psoriasis rebound (rapidly spreading psoriasis after treatment withdrawal).
- 36.8% and 61.0% of patients who received tofacitinib 5 mg and 10 mg twice daily, respectively, achieved a PASI75; and
- 44.8% and 57.1% of patients who received tofacitinib 5 mg and 10 mg twice daily, respectively, achieved a PGA of “clear” or “almost clear” skin.
OPT Retreatment is one of five studies from the Phase 3 OPT Clinical Trial Program, one of the largest global clinical trial programs in moderate-to-severe chronic plaque psoriasis to date. The results from this study will be included in the planned tofacitinib psoriasis submission package to regulatory authorities in various markets. Pfizer currently intends to submit a supplemental New Drug Application (sNDA) to the U.S. Food and Drug Administration (FDA) for the approval of tofacitinib for the treatment of adults with moderate-to-severe chronic plaque psoriasis by early 2015.About the OPT Clinical Trial Program The Phase 3 OPT clinical trial program consists of five studies (including one long-term extension study) evaluating oral tofacitinib 5 mg and 10 mg twice daily in adults with moderate-to-severe chronic plaque psoriasis. It is a global, comprehensive clinical development program that includes over 3,600 patients in 36 countries, and is one of the largest global clinical trial programs in moderate-to-severe chronic plaque psoriasis to date. In addition to the OPT Retreatment study, the OPT Program includes the following Phase 3 studies of tofacitinib in adults with moderate-to-severe plaque psoriasis:
- OPT Pivotal #1 (A3921078) and OPT Pivotal #2 (A3921079): OPT Pivotal #1 and OPT Pivotal #2 are 52-week, randomized, double-blind, placebo-controlled, parallel-group studies evaluating the safety and efficacy of tofacitinib 5 mg and 10 mg twice daily in patients who are candidates for systemic therapy or phototherapy. There were over 900 patients randomized into the each of the studies. As previously announced in April 2014, the OPT Pivotal #1 and OPT Pivotal #2 studies showed that tofacitinib, as a 5 mg or a 10 mg dose taken as a pill twice daily, met the primary efficacy endpoints of statistically significant superiority over placebo at Week 16 in the proportion of subjects achieving a PGA response of “clear” or “almost clear” skin, and the proportion of subjects achieving at least a 75% reduction in Psoriasis Area and Severity Index (PASI75).
- OPT Compare ( A3921080): A 12-week, Phase 3 study comparing the efficacy and safety of tofacitinib 5 mg and 10 mg twice daily to high-dose ENBREL® (etanercept) 50 mg twice weekly as well as to placebo. There were 1,106 patients enrolled in this study.
- OPT Extend (A3921061): A long-term extension study evaluating the safety and tolerability of tofacitinib. Patients who participated in the Phase 2 trial or any of the other Phase 3 studies had the option, if eligible, to enroll in this study.
- It is not known if XELJANZ is safe and effective in people with Hepatitis B or C.
- XELJANZ is not for people with severe liver problems.
- It is not known if XELJANZ is safe and effective in children.
- XELJANZ can lower the ability of the immune system to fight infections. Some people have serious infections while taking XELJANZ, including tuberculosis (TB), and infections caused by bacteria, fungi, or viruses that can spread throughout the body. Some people have died from these infections. Healthcare providers should test patients for TB before starting XELJANZ, and monitor them closely for signs and symptoms of TB and other infections during treatment. People should not start taking XELJANZ if they have any kind of infection unless their healthcare provider tells them it is okay.
- XELJANZ may increase the risk of certain cancers by changing the way the immune system works. Malignancies were observed in clinical studies of XELJANZ.
- The risks and benefits of treatment should be considered prior to initiating XELJANZ in patients with chronic or recurrent infection; who have been exposed to tuberculosis; with a history of a serious or an opportunistic infection; who have resided or traveled in areas of endemic tuberculosis or endemic mycoses; or with underlying conditions that may predispose them to infection.
- Viral reactivation, including cases of herpes virus reactivation (e.g., herpes zoster), was observed in clinical studies with XELJANZ.
- Use of live vaccines should be avoided concurrently with XELJANZ. Update immunizations in agreement with current immunization guidelines prior to initiating XELJANZ therapy.
- Some people who have taken XELJANZ with certain other medicines to prevent kidney transplant rejection have had a problem with certain white blood cells growing out of control (Epstein Barr virus-associated post-transplant lymphoproliferative disorder).
- Some people taking XELJANZ get tears in their stomach or intestines. This happens most often in people who also take nonsteroidal anti-inflammatory drugs (NSAIDs), corticosteroids, or methotrexate. Patients should tell their healthcare provider right away if they have fever and stomach-area pain that does not go away, or a change in bowel habits. XELJANZ should be used with caution in patients who may be at increased risk for gastrointestinal perforation (e.g., patients with a history of diverticulitis).
- XELJANZ can cause changes in certain lab test results including low blood cell counts, increases in certain liver tests, and increases in cholesterol levels. Healthcare providers should do blood tests before starting patients on XELJANZ and while they are taking XELJANZ, to check for these side effects. Normal cholesterol levels are important to good heart health. Healthcare providers may stop XELJANZ treatment because of changes in blood cell counts or liver test results.
- Use of XELJANZ in patients with severe hepatic impairment is not recommended.
- Patients should tell their healthcare providers if they plan to become pregnant or are pregnant.
- Patients should tell their healthcare providers if they plan to breastfeed or are breastfeeding. Patients and their healthcare provider should decide if they will take XELJANZ or breastfeed. They should not do both.
- In carriers of the hepatitis B or C virus (viruses that affect the liver), the virus may become active while using XELJANZ. Healthcare providers may do blood tests before and during treatment with XELJANZ.
- Common side effects include upper respiratory tract infections (common cold, sinus infections), headache, diarrhea, and nasal congestion, sore throat, and runny nose (nasopharyngitis).
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