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Tuesday, June 26, 2018

(臨床III期失敗) DNA疫苗ASP0113 用於CMV (Cytomegalovirus) reactivation


安斯泰來與Vical開發巨細胞病毒疫苗臨床III期遇挫 MedMed醫學傳播時訊 文章來源:新浪醫藥新聞編譯:Bernardo安斯泰來製藥和Vical123日宣佈,作為一種針對巨細胞病毒(CMV)陽性的造血幹細胞移植(HSCT)接受者而開發的研究性DNA疫苗ASP0113,在IIIHELIOS臨床試驗中未達到其主要或次要終點。該疫苗耐受性好,且注射部位的反應是通常所報導的不良事件。安斯泰來的開發總裁Bernhardt G. Zeiher表示:"對於CMV終末器官疾病的整體生存率下降在研究中沒有顯示出顯著改善,我們感到失望。但要感謝參與這個重要試驗的病人和臨床醫生。"該臨床III期試驗設計旨在評價ASP0113,對比安慰劑,在接受異基因HSCTCMV血清陽性受者中的有效性。在移植後的第一年,使用總死亡率和CMV末端器官疾病的主要複合終點來評估效力,而該終點未被達到。第一個方案限定的CMV病毒血症時間的次要終點和第一次使用判定的CMV特異性抗病毒療法的時間也未被達到。Vical公司的首席執行官Vijay Samant表示:"臨床III期的結果令人失望。安斯泰來和Vical的員工們、研究者和研究現場的人員在這項研究中做的相當出色,但不幸的是,這種疫苗無法為這個難治的患者群體提供全因死亡率的保護。"該臨床III期試驗是一項11隨機、雙盲、安慰劑對照的研究,共招募了514名接受造血幹細胞移植的CMV血清陽性受試者。通過供受體的相關性和供體CMV血清狀態進行隨機化分層。受試者移植後隨訪1年。CMV是一種皰疹病毒,在美國估計有一半以上的成年人到50歲時會被感染,在發展中國家更為普遍。健康的免疫系統通常保護感染者免受CMV疾病侵擾,但不能預防或清除潛伏感染。免疫系統功能不全的個體伴有CMV重新啟動的高風險,可能會導致嚴重的疾病或死亡。這些處於高風險的群體包括HCT和實體器官移植受者,以及母親在懷孕期間首先感染的嬰兒。ASP0113是一種被設計用於預防CMV-血清陽性HCT受者的CMV疾病和相關併發症的研究性候選疫苗,是一種編碼CMV磷蛋白65和誘導細胞和體液免疫應答的糖蛋白B抗原的二價體DNA疫苗,由專有的基於泊洛沙姆的載體系統配製而成。ASP0113最初由Vical開發,與Astellas合作進行進一步的開發和商業化。該藥物在美國和歐洲被認定為孤兒藥物。
About Cytomegalovirus  CMV is a herpes virus that is estimated to infect more than half of all adults in the United States by age 50, and is even more widespread in developing countries. A healthy immune system typically protects an infected person against CMV disease, but does not prevent or clear latent infection. Individuals whose immune systems are not fully functional are at high risk of CMV reactivation, potentially leading to severe illness or death. Those at greatest risk include HCT and solid-organ transplant recipients, as well as infants born to mothers who first become infected during pregnancy.
About ASP0113 ASP0113 is an investigational vaccine candidate designed to prevent CMV disease and associated complications in CMV-seropositive HCT recipients. ASP0113 is a bivalent DNA vaccine encoding CMV phosphoprotein 65 and glycoprotein B antigens for induction of both cellular and humoral immune responses, formulated with a proprietary poloxamer-based delivery system. ASP0113 was initially developed by Vical which partnered with Astellas for further development and commercialization. ASP0113 received Orphan Drug Designation in the United States and Europe.

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