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Alefacept for Psoriasis and Psoriatic Arthritis a B Gottlieb

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Alefacept for Psoriasis and Psoriatic Arthritis a B Gottlieb iv58 Ann Rheum Dis: first published as 10.1136/ard.2005.042655 on 20 October 2005. Downloaded from REPORT Alefacept for psoriasis and psoriatic arthritis A B Gottlieb ............................................................................................................................... Ann Rheum Dis 2005;64:iv58–iv60. doi: 10.1136/ard.2005.042655 there was no evidence of tachyphylaxis during multiple Alefacept is a bioengineered fusion protein of soluble courses of treatment12 lymphocyte function antigen (LFA-3) with Fc fragments of IgG1. It is marketed in many countries for the treatment of moderate to severe psoriasis. This paper reviews the data Monitoring drug safety supporting the use of alefacept in psoriasis and psoriatic The safety profile of alefacept is encouraging, with some arthritis. patients having received up to nine courses of alefacept in phase 2 and 3 clinical trials and their extensions. There was no increase in adverse events in patients treated with alefacept compared with placebo.5 Consistent with memory effector T cell depletion as a mechanism of action was the lefacept is a bioengineered fusion protein of soluble requirement for weekly monitoring of circulating CD4+ T cell Lymphocyte Function Antigen (LFA-3)1 with Fc frag- counts during the 12 dosing weeks in phase 3 clinical trials. ments of IgG1. It is marketed in the USA, Australia, A Patients did not start taking alefacept if their CD4+ T cell Canada, Argentina, Switzerland, Kuwait, and Israel as count was ,400; dosing was withheld when the CD4+ T cell monotherapy for the treatment of moderate to severe count fell below 250. However, patients whose CD4+ T cell psoriasis vulgaris. It binds to CD2 on memory effector T cells counts fell below 250 in clinical trials did not experience an and blocks the interaction between LFA-3 on antigen increased incidence of infection.11 There was no increased presenting cells (APCs) and CD2 on the activated T cells. It incidence of malignancies, including cutaneous cancers, in is thought to deplete CD2+T cells by binding to natural killer clinical trials comparing alefacept with placebo.51113 (NK) cells via its Fc region.2 Although its mechanism of Although larger numbers of patients are needed, repeated action in vivo is incompletely understood, it is thought to administration of alefacept, with some patients having improve psoriasis by inducing apoptosis of memory T cells, received up to nine clinical trial courses of alefacept, showed inhibiting costimulation of T cells, decreasing inflammatory a favourable safety profile, with no increase in malignancies gene expression by multiple cell types and decreasing or serious infections over repeat courses.14 infiltration of T cells and dendritic cells (DCs) in psoriatic Data from nine multicentre, randomised, phase 2 and 3 plaques.2–4 Over 12 000 patients with psoriasis have been clinical studies (and their extensions) were integrated to treated with alefacept since its approval in 2003. This paper evaluate the safety and efficacy of alefacept in three special, reviews the available data for the treatment of psoriasis and potentially higher risk, patient populations—elderly, obese, http://ard.bmj.com/ introduces the results of the recent phase 2 study of alefacept and diabetic patients.15 Elderly patients were those who were in combination with methotrexate for the treatment of >65 years of age at the time of the first alefacept dose psoriatic arthritis. (n = 99). Obese patients had a body mass index >30 kg/m2 (n = 652). Diabetic patients were identified as having a CLINICAL TRIALS OF ALEFACEPT IN PSORIASIS history of diabetes (n = 122). The patients received up to four In a randomised, double blind, placebo controlled phase 3 courses of alefacept. Similar proportions of patients achieved study, patients with moderate to severe psoriasis vulgaris PASI 75 in all three subgroups as did the total clinical trial were treated with alefacept 15 mg monotherapy or placebo population. There were no differences in safety observed in on September 27, 2021 by guest. Protected copyright. intramuscularly (IM) on a weekly basis for 12 weeks.5 The any of the three subgroups compared with the total clinical primary endpoint was predetermined at two weeks following trial population. As clinical experience with alefacept the twelfth injection of alefacept. Patients were then accumulates, future analyses involving larger numbers of observed for 12 weeks on no therapy except for emollients. elderly, obese, and diabetic patients will help to confirm these At the primary endpoint, 21% of patients achieved at least a results. 75% improvement in psoriasis disease activity as measured by Alefacept demonstrated clinical improvement in patients the Psoriasis Area and Severity Index (PASI 75).6 However, with special forms of psoriasis. Two patients with palmo- during the 12 week follow up period, an additional 7% of plantar psoriasis were successfully treated with a course of patients achieved PASI 75. A second 12 week course of alefacept monotherapy16 in addition to a patient with alefacept resulted in an additional 10% of patients achieving palmoplantar pustular psoriasis.17 In exploratory studies, PASI 75 with an overall response of 43% of patients reaching clinically significant improvement in nail psoriasis, which is PASI 75.7 Approximately half of the patients reached PASI 50 often difficult to treat, has been noted.18 19 at any time during the first course, and after a second course, To evaluate the effect of alefacept on immune function, T 69% reached PASI 50.7 Unfortunately, the extent of circulat- cell dependent humoral responses to a neoantigen (wX174) ing CD4+ T cell depletion did not predict a patient’s response and recall antigen (tetanus toxoid) were assessed.20 Psoriatic during treatment or follow up.3 Alefacept is a remittive patients were randomised to alefacept (7.5 mg intravenously treatment, allowing patients time away from therapy.8–11 In weekly for 12 weeks) or control group. The alefacept group those patients achieving a PASI 75 or better at any time received wX174 immunisations at weeks 6, 12, 20, and 26 and during the first course of therapy, the time until loss of a tetanus toxoid at week 21; controls received wX174 at weeks 6 PASI 50 response was a median of 209 days.8 Treatment with and 12, and tetanus at week 10. Mean anti-wX174 titres were multiple courses of alefacept showed increasing efficacy and comparable in the two groups. There was no difference in the www.annrheumdis.com Alefacept for psoriasis and psoriatic arthritis iv59 Ann Rheum Dis: first published as 10.1136/ard.2005.042655 on 20 October 2005. Downloaded from percentage of responders (anti-wX174 IgG >30% of the total months after the last dose of alefacept. At baseline the mean anti-wX174) between the alefacept and control groups (86% methotrexate dose was approximately 14 mg/week. Baseline and 82%, respectively; p = 0.73). The percentage of patients weight, duration of psoriatic arthritis, number of tender and whose anti-tetanus toxoid titre increased >2 times the swollen joints, pain score, quality of life score (Heath baseline was also similar (alefacept, 89%; control 91%). Assessment Questionnaire, disability index (HAQ-DI)), phy- Thus, a single 12 week course of alefacept did not impair sician and patient global assessment scores, and erythrocyte primary or secondary antibody responses to a neoantigen sedimentation rates were comparable in both cohorts. The (despite the fact that immunisation occurred during the baseline C-reactive protein was slightly higher in the placebo trough of CD4+ T cell counts) or memory responses to a recall (16.7) as compared with the alefacept treated (13.8) cohort. antigen. Alefacept treatment appears to maintain a humoral At the primary endpoint (six months), 54% of the alefacept immune response to vaccination, and presumably, infection. versus only 23% of the placebo cohort achieved an ACR 20. In the USA, alefacept is indicated in patients with There were no increased numbers of adverse events in the moderate to severe psoriasis vulgaris who are candidates for alefacept treated cohort compared with the placebo cohort. systemic or phototherapy. Patients must have circulating CD4 Alefacept in combination with methotrexate was evaluated in count of at least 400 prior to starting alefacept. Currently, a small pilot study in rheumatoid arthritis, with a significant CD4 T cell counts must be monitored weekly and alefacept proportion of patients achieving ACR 20 compared with doses should be held if the CD4 count falls below 250. placebo.30 Patients receive 12, weekly doses of alefacept 15 mg IM followed by a 12 week observation period. If their psoriasis flares during this observation period, patients may be offered CONCLUDING REMARKS a second 12 week course of alefacept. There are patients who Unanswered questions remain regarding the mechanism of have received up to 10 courses of alefacept in clinical trials or action of alefacept in psoriasis: in community practice, but the numbers of these patients are N If depletion of memory T cell via apoptosis is a still limited.711 Studies are under way to determine if less predominant mechanism of action why is the onset of frequent monitoring of circulating CD4+ T cells—both every 2 two weeks and monthly—is equivalent to the current weekly action of alefacept delayed? monitoring requirement. To date, there have been no safety N Why is it that depletion of circulating CD4+ T cells is not related issues surrounding reduced monitoring or in patients predictive of clinical response?11 13 with CD4+ counts that went below 250 during treatment.21 In N If memory T cells are pathogenic, why do only a third of addition, long term efficacy and safety databases have been patients achieve PASI 75? established for alefacept as it is used by community and N If CD4 memory T cells are depleted by alefacept why is the academic dermatologists.
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