[新聞] CureVac’s Covid-19 Vaccine Disappoints in Clinical Trial
原文標題:
CureVac’s Covid-19 Vaccine Disappoints in Clinical Trial
CureVac 的 Covid-19 疫苗在臨床試驗中令人失望
原文連結:
https://www.nytimes.com/2021/06/16/health/covid-vaccine-curevac.html
發布時間:
June 16, 2021, 5:25 p.m. ET
原文內容:
The German company CureVac delivered disappointing preliminary results on
Wednesday from a clinical trial of its Covid-19 vaccine, dimming hopes that
it could help fill the world’s great need.
The trial, which included 40,000 volunteers in Latin America and Europe,
estimated that CureVac’s mRNA vaccine had an efficacy of just 47 percent,
among the lowest reported so far from any Covid-19 vaccine maker. The trial
will continue as researchers monitor volunteers for new cases of Covid-19,
with a final analysis expected in two to three weeks.
“We’re going to full speed for the final readout,” Franz-Werner Haas,
CureVac’s chief executive, said in an interview. “We are still planning for
filing for approval.”
The company plans to apply for authorization initially to the European
Medicines Agency. The European Union reached an agreement last year to
purchase 405 million doses of the vaccine if the agency authorizes it.
Independent experts, however, said it would be difficult for CureVac to
recover. Natalie Dean, a biostatistician at the University of Florida, said
that the vaccine’s efficacy rate might improve somewhat by the end of the
trial. But because most of the data is already in, it’s unlikely the vaccine
will turn out to be highly protective. “It’s not going to change
dramatically,” she said.
And with an efficacy rate that low — far lower than the roughly 95 percent
of competing mRNA vaccines made by Pfizer-BioNTech and Moderna — the results
do not bode well for CureVac’s shots getting adopted.
“This is pretty devastating for them,” said Jacob Kirkegaard, a vaccine
supply expert at the Peterson Institute for International Economics, a think
tank in Washington.
The news was disappointing to experts who had hoped the company could provide
vaccines for low- and middle-income countries that don’t have nearly enough.
CureVac had some advantages over the other mRNA vaccines, such as keeping
stable for months in a refrigerator. What’s more, compared with its
competitors, CureVac’s vaccine used fewer mRNA molecules per jab, lowering
its cost.
The trial results released on Wednesday were based on data from 135
volunteers who got sick with Covid-19. An independent panel compared the
number of sick people who had received a placebo with those who had received
the vaccine. Although the vaccine did seem to offer some protection, the
statistical difference between the two groups was not stark, working out to
an efficacy rate of 47 percent.
Annual flu shots, by comparison, can reach 40 to 60 percent effectiveness.
Both the World Health Organization and the Food and Drug Administration set a
threshold of 50 percent efficacy to consider Covid-19 vaccines for emergency
authorization. If CureVac were to stay at 47 percent in the final analysis,
it would fail to meet that standard.
The results caught scientists by surprise. The vaccine is made from
engineered mRNA, the same technology used by the Pfizer-BioNTech and Moderna
vaccines. And CureVac’s shots yielded promising results in animal
experiments and early clinical trials.
“This one’s a bit of a head-scratcher,” Dr. Dean said.
Dr. Haas blamed the disappointing results on the high number of virus
variants in the countries where the vaccine was tested. Out of 124 of the
Covid-19 cases that the company’s scientists genetically sequenced, only one
was caused by the original version of the coronavirus.
機翻如下:
德國公司CureVac週三公佈了其Covid-19疫苗的一項臨床試驗的初步結果,令人失望,使
其能夠幫助填補世界上的巨大需求的希望破滅。
該試驗包括拉丁美洲和歐洲的4萬名志願者,估計CureVac公司的mRNA疫苗的療效僅為47%
,是迄今為止任何Covid-19疫苗製造商報告的最低療效之一。該試驗將繼續進行,研究人
員將監測志願者是否出現新的Covid-19病例,預計兩到三周後將進行最終分析。
"CureVac公司首席執行官Franz-Werner Haas在接受採訪時說:"我們正在全速進行最後的
解讀。"我們仍在計畫申請批准"。
該公司計畫首先向歐洲藥品管理局申請授權。歐盟去年達成協議,如果該機構授權,將購
買4.05億劑量的疫苗。
然而,獨立專家表示,CureVac公司將很難恢復。佛羅里達大學的生物統計學家Natalie
Dean說,在試驗結束時,該疫苗的有效率可能會有一些提高。但由於大部分數據已經出來
了,疫苗不太可能變成高度保護性的。"她說:"它不會有很大的變化。
而且療效如此之低--遠遠低於輝瑞生物技術公司和Moderna公司生產的競爭性mRNA疫苗的
大約95%--這些結果對於CureVac公司的疫苗被採用不是一個好兆頭。
"華盛頓智庫彼得森國際經濟研究所的疫苗供應專家Jacob Kirkegaard說:"這對他們來說
是相當大的打擊。
這一消息令專家們感到失望,他們曾希望該公司能夠為中低收入國家提供疫苗,因為這些
國家的疫苗幾乎是不夠的。與其他mRNA疫苗相比,CureVac有一些優勢,如在冰箱中保持
穩定數月。更重要的是,與競爭對手相比,CureVac的疫苗每次注射使用的mRNA分子更少
,降低了成本。
週三公佈的試驗結果是基於135名感染Covid-19的志願者的資料。一個獨立小組比較了接
受安慰劑和接受疫苗的人的患病人數。儘管該疫苗似乎確實提供了一些保護,但兩組之間
的統計差異並不明顯,其有效率為47%。
相比之下,每年的流感疫苗可以達到40%到60%的效果。世界衛生組織和美國食品和藥物管
理局都設定了一個閾值,即50%的療效,以考慮對Covid-19疫苗進行緊急授權。如果
CureVac在最終分析中保持在47%的水準,它將無法達到這一標準。
這一結果讓科學家們大吃一驚。該疫苗由工程mRNA製成,與輝瑞-生物技術公司和Moderna
疫苗使用的技術相同。而且CureVac的針劑在動物實驗和早期臨床試驗中產生了令人鼓舞
的結果。
迪恩博士說:"這個問題有點讓人頭疼"。
哈斯博士將令人失望的結果歸咎於在測試疫苗的國家中存在大量的病毒變體。在該公司科
學家進行基因測序的124個Covid-19病例中,只有一個是由原始版本的冠狀病毒引起的。
心得/評論:
針對delta變種的新希望curevac初步報告大爆死.........
連50%都沒到
這是mRNA技術近期最不利的消息了
雖然我還是對mRNA的前景充滿信心
但是不能不承認這是一大衝擊
讓我們繼續看下去
--
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※ 編輯: nangle (1.200.77.121 臺灣), 06/17/2021 06:15:51
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這對於mRNA最大的衝擊在於
市場對於針對新變種的新疫苗研發是否成功的信心受到衝擊
如果美歐持續對於EUA授權和補助縮手
那廠商對於新疫苗的開發態度會受到很大的打擊
因為開發新疫苗的風險太高了
※ 編輯: nangle (1.200.77.121 臺灣), 06/17/2021 06:27:09
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我很支持mRNA,但是要捧mRNA不需要踩次蛋白
Novavax 宣布,其重組奈米顆粒蛋白的 COVID-19 疫苗 NVX-CoV2373 顯示出對
COVID-19 中度和重症的保護力為 100%(95%CI=87.0-100),整體有效性為 90.4%(
95%CI=82.9-94.6),達到主要試驗終點。其中,該疫苗對由原始新冠病毒(SARS-Cov-2
)株引起的輕度、中度和重度症狀的保護力為 96.4%,以及對英國、巴西、南非及印度等
變種病毒的保護力達 93%。
另外,該疫苗在高風險族群(定義為 65 歲以上、65 歲以下有某些併發症或生活環境頻
繁接觸 COVID-19 患者)中的保護力也達 91.0%(95% CI=83.6-95.0)。
※ 編輯: nangle (1.200.77.121 臺灣), 06/17/2021 06:46:12
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