当前位置:首页>PPT>EULAR 速递 | (附PPT,建议先收藏)Wolfgang Merkt 教授:三类 BiTE 双特异性 T 细胞衔接器攻坚难治风湿病!

EULAR 速递 | (附PPT,建议先收藏)Wolfgang Merkt 教授:三类 BiTE 双特异性 T 细胞衔接器攻坚难治风湿病!

  • 2026-07-02 14:27:03
EULAR 速递 | (附PPT,建议先收藏)Wolfgang Merkt 教授:三类 BiTE 双特异性 T 细胞衔接器攻坚难治风湿病!

2026 欧洲风湿病学年会(EULAR),德国巴德克罗伊茨纳赫风湿中心 Wolfgang Merkt 教授带来专题汇报《BiTE me - Bi-specific T-cell Engagers in RMDs》,汇总全球 BiTE 用于自身免疫病全部临床病例数据,围绕 Teclistamab、Blinatumomab、Mosunetuzumab 三款核心药物,详解作用机制、真实世界疗效、不良反应与硬皮病纤维化创新治疗思路,为难治类风湿关节炎、SLE、系统性硬化、ANCA 相关血管炎临床诊疗提供重要参考。

一、传统 B 细胞靶向药存短板,BiTE 助力实现免疫重置

利妥昔单抗是临床经典 CD20 靶向药物,但临床应用局限性突出:①浆细胞不表达 CD20,药物无法清除长效浆细胞,自身抗体持续分泌;②Fc 受体基因多态性、病灶 NK 细胞缺失会削弱药物杀伤效率;③B 细胞治疗后易再次增殖活化,造成病情反复。

为实现组织深部 B 细胞清除,免疫重置成为难治风湿疾病的治疗新目标。传统免疫药物仅能控制症状,无法纠正紊乱的免疫系统;免疫重置可清除致病性浆细胞与异常淋巴细胞,从源头减少自身抗体生成,实现长期病情缓解,而 BiTE 双特异性抗体正是实现免疫重置的重要工具。

BiTE 药物通过双靶向结构,一端结合 T 细胞 CD3、一端结合 B 细胞表面抗原,直接拉近两类细胞形成免疫突触,激活 T 细胞释放穿孔素、颗粒酶裂解致病 B 细胞,无需体外细胞改造,给药后依托体内天然 T 细胞起效,主要不良反应为细胞因子释放综合征(CRS)。

二、三款主流 BiTE 结构各异,临床适应症精准区分

分子结构直接决定药物半衰期、给药方式与适用病种,目前风湿领域三大在研 BiTE 特点汇总:

1.Blinatumomab(CD19×CD3):仅由 scFv 片段组成、无 Fc 段,半衰期约 2h,需 24 小时持续静脉输注;靶向全阶段 B 细胞,但不作用于浆细胞,无法根除浆细胞源性自身抗体,多用于类风湿关节炎、抗合成酶综合征、轻症系统性硬化。

2.Teclistamab(BCMA×CD3):完整 IgG 结构带 Fc 片段,半衰期更长、可间歇输注;靶点 BCMA 特异性表达于浆细胞,是唯一能深度清除组织浆细胞的 BiTE,自身抗体下降效果最优;缺点是易诱发低丙种球蛋白血症,必要时需 IVIG 替代治疗,优选高自身抗体负荷的 SLE、ITP、难治 SSc 患者。

3.Mosunetuzumab(CD20×CD3):全长 IgG 构型,既往获批淋巴瘤适应症,Merkt 团队完成全球首例风湿病探索;靶向成熟 B 细胞,对长寿浆细胞影响小,低丙球不良反应罕见,现有皮下剂型临床试验,适合病灶 NK 细胞缺失的肉芽肿性多血管炎(GPA)。

除 BiTE 外,深度清除 B 细胞还有两条路线:CAR-T 细胞疗法(体外制备、价格昂贵)、Fc 优化单抗(奥法木单抗等,依赖病灶 NK 细胞发挥药效,NK 缺失病灶疗效受限)。

三、80 例汇总安全数据 + 多病种临床真实疗效

现有 BiTE 风湿病临床证据均来自个案报道与小样本队列,2026 年 3 月一项综述汇总 80 例用药患者安全数据:

①近半数患者发生 CRS,以 1~2 级轻症为主,3 级 CRS 发生率少见;

②全组无 ICANS(免疫相关神经毒性)病例,神经安全性优异;

③低丙种球蛋白是主要远期不良反应,多见于 Teclistamab 使用者。

1.Teclistamab:浆细胞靶向,SLE/ITP/SSc 获益显著

▌SLE:多线耐药患者用药 6 周,临床症状完全缓解,抗 ds-DNA、补体 C3 恢复正常;个别病例继发炎症性银屑病、肠道炎症,维得利珠单抗可有效控制并发症。

▌ITP:用药 1 周抗血小板抗体转阴,骨髓活检证实 14~40 天骨髓浆细胞完全清除,阶梯诱导方案已被临床广泛借鉴。

▌SSc:CD19 靶向 CAR-T 难以清除 Scl-70 抗体,Teclistamab 可显著下调 Scl-70 滴度。Merkt 团队 5 例重度 SSc 采用「Teclistamab 诱导 + 利妥昔单抗维持」,全部患者 mRSS 皮肤评分下降超 1/3,肺功能 FVC 保持稳定;入组患者病程晚、纤维化偏重,肺部纤维化难以逆转。

2.Blinatumomab:短效药物,单药短期有效、停药易复发

▌RA:短疗程小剂量用药可短暂改善症状,6 周后病情反弹,RF、抗 CCP 无法转阴,需阿巴西普补救治疗。

▌抗 Jo-1 阳性肌炎:用药后 CK 快速下降,但停药后 B 细胞快速再生、Jo-1 抗体反弹复发;优化方案:多轮 Blinatumomab 诱导 + 每 3 个月利妥昔单抗维持,可实现抗体持续转阴。

▌SSc:法国 5 例单疗程无维持方案显示:仅短期改善症状,数周后 B 细胞重建、抗体回升,过半患者需补救治疗。

3.Mosunetuzumab:全球首创 GPA 用药,攻克 NK 缺失难治病灶

一例眶周肉芽肿型难治 GPA 患者,经利妥昔单抗、环磷酰胺、阿伐科普规范治疗仍反复复发;病灶病理提示:肉芽肿富含 CD20+B 细胞、T 细胞,完全无 NK 细胞浸润,所有 NK 依赖型 CD20 单抗失效。

单用 Mosunetuzumab 无需加量激素,患者实现长期完全缓解,眶周肉芽肿缩小、复视痊愈,PR3-ANCA 合成被彻底阻断。该病例创下三项第一:全球首次在风湿领域超适应症使用、首个 CD20-BiTE 用于血管炎、首个门诊便捷给药 BiTE。目前皮下注射剂型 Ⅰ 期临床正在开展。

四、关键观点:免疫重置≠逆转纤维化,SSc 治疗迈入双通路新模式

Merkt 教授提出重要临床理念:单纯清除 B 细胞、实现免疫重置,无法逆转终末期脏器纤维化。

1. 疾病分两阶段:早期由自身免疫、B 细胞 / 自身抗体驱动,BiTE、CAR-T 干预效果理想;病程后期成纤维细胞自主活化,脱离自身免疫刺激仍持续分泌胶原,形成不可逆纤维化。

2. 海德堡 CAR-T 临床数据证实:即便自身抗体全部转阴,肺部活化成纤维细胞仅下降 58%,纤维化病灶无法完全消退。

SSc 未来联合治疗新思路

疾病早期:BiTE/CAR-T 清除 B 细胞,切断自身免疫诱因;

纤维化晚期:免疫靶向联合 NKG2A 抑制剂,活化 NK 细胞清除衰老促纤维化成纤维细胞,打破纤维化恶性循环,相关基础研究数据已发表。

五、临床总结与未来研究方向

临床用药总结

1. BiTE 对利妥昔单抗耐药的难治风湿病整体有效,单药短疗程易复发,诱导 + 序贯维持是提升长期缓解率的优选方案;

2. 个体化选药:病灶 NK 充足可选 Fc 优化单抗;NK 匮乏(GPA 肉芽肿、部分 SSc)优先 BiTE;高浆细胞、高自身抗体首选 Teclistamab;

3. 安全管控:Teclistamab 重点监测低丙种球蛋白与继发感染;Blinatumomab 关注持续输注管理;Mosunetuzumab 不良反应最轻。

未来探索方向

1. 开展前瞻性临床试验,补充高级别循证证据;

2. 开发疗效、不良反应相关生物标志物;

3. 推进 BiTE 联合抗纤维化药物的组合疗法;

4. 优化皮下长效剂型,简化给药流程。

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  1. CONNECT:[ UseTime:0.000686s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000926s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000311s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000314s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000749s ]
  6. SELECT * FROM `set` [ RunTime:0.000233s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000657s ]
  8. SELECT * FROM `article` WHERE `id` = 528173 LIMIT 1 [ RunTime:0.000425s ]
  9. UPDATE `article` SET `lasttime` = 1783291979 WHERE `id` = 528173 [ RunTime:0.011443s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000278s ]
  11. SELECT * FROM `article` WHERE `id` < 528173 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000529s ]
  12. SELECT * FROM `article` WHERE `id` > 528173 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.010703s ]
  13. SELECT * FROM `article` WHERE `id` < 528173 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.009108s ]
  14. SELECT * FROM `article` WHERE `id` < 528173 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000792s ]
  15. SELECT * FROM `article` WHERE `id` < 528173 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002167s ]
0.110642s