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科濟藥業(2171.HK)管理層交流紀要解讀
uSMART盈立智投 07-21 16:52

科濟藥業嘉賓:科濟藥業CEO李宗海

腫瘤細胞治療具有較高的關注度,其中現階段最受關注的是CAR修飾的各種細胞。近幾年,有數款治療血液瘤的細胞療法陸續在中美上市,具有較好的療效,有可能成爲治癒癌症的革命性手段。

2017年,第一款產品CAR-T細胞治療產品上市到現在已經有近五年的時間,市場也在不斷的成熟。對於藥企來說,生產製造和臨牀管理具有較高的難度,經驗需要不斷的積累。2021年,全球CAR-T市場達到17億美元。國內兩款產品售價分別爲120萬元和129萬元,較美國產品價格優勢顯著。

CAR-T開發挑戰:

1、實體瘤療效

對策:1)促進增值和持續性:CAR信號改造、共表達細胞因子;2)增加浸潤到腫瘤組織:共表達趨化因子或趨化因子受體,聯合抗血管新生等;3)減免CAR-T失能:敲除PD-1表達,減少Tonicsignaling,聯合治療;4)抗原異質性問題:調動抗原交叉呈遞,雙靶點/多靶點,表達雙功能抗體等

CT041–潛在改變實體瘤治療模式的CLDN18.2CAR-T候選產品

療效及安全性:中國Ib/II期:mPFS:8.8m,mOS:10.8m,大於等於3級CRS:1例;

美國Ib期:mPFS:NR,mOS:NR,沒有大於等於3級CRS

CycloCAR®:IL-7和CCL-21共表達以增強對實體瘤的療效

IL-7可以增加T細胞活性,CCL-21可以招募T細胞。較第二代CAR-T具有更好的腫瘤浸潤能力及抗腫瘤效果,可以看到T細胞進入腫瘤組織,部分可以達到CR。

2、製造成本和製造能力

公司分別在上海和北卡建設廠房,生產的載體可以供全球使用。北卡的廠房正在進行技術轉移。

THANK-uCAR®:差異化的同種異體CAR-T技術平臺

目前的問題:CAR-T細胞的擴增沒有達到目標量;異體CAR-T被排異後不能發揮療效(部分數據很好CR大於50%,但DOR很短,因爲CR可能是化療聯用導致的,並沒有完全清除腫瘤)對策:THANK-uCAR®T細胞可以增強uCAR-T細胞的存活與擴增,CT0590能在體內激活NK細胞的情況下消滅腫瘤細胞。

3、住院成本(美國住院成本較高)

對策:與CAR的設計和技術細節相關,使安全性可控。公司產品在美國臨牀試驗未見到3級以上的CRS,降低住院成本。

4、靶點可及性

HER2CAR-T:有病人因爲CAR-T相關毒性去世(當時劑量較高,右肺發生大量浸潤);CAIXCAR-T(一代CAR-T):腎細胞癌靶點,膽管上皮細胞高表達,很多病人出現肝功能紊亂,CAR-T浸潤膽管上皮細胞

對策:通過人工受體調節治療性蛋白在疾病部位表達併發揮功能,利用組織特異性抗原使T細胞在特定的組織發揮作用(膠質母細胞瘤腫瘤特異性抗體爲EGFRvIII,但抑制作用較強,可以將其作爲T細胞的觸發抗原,使其在膠質母細胞瘤中特異性發揮作用)

LADAR®(LocalActionDrivenbyArtificialReceptor)用於精準靶向的技術平臺Q&A:

Q:對於CAR-T靶點集中度如何看待?

A:不光是CAR-T,其他單抗、ADC等熱門的療法,靶點集中度也很高。CAR-T承擔着腫瘤治療的重大任務,必須考慮靶點可及性的問題。對於部分沒有特異性抗原的癌種,也可以考慮腫瘤特異性的糖基化、雙抗等療法。

Q:如何看待公司產品與其他CAR-T產品(比如CAR-NK)的競爭?

A:公司目前是CAR-T細胞療法佔多數,CAR-T細胞可以在體內大量擴增,CAR-NK細胞在體內的擴增還很難與CAR-T細胞相比,較難真正達到療效。

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