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Blood:T细胞淋巴瘤患者采用鲁索替尼靶向抑制JAK/STAT的临床获益情况

2022-01-07 Nebula MedSci原创

外周 T 细胞淋巴瘤患者或可采用靶向 JAK/STAT 抑制的精确治疗策略

外周 T 细胞淋巴瘤 (PTCL) )和非真蕈样真菌病 (非MF) 皮肤 T 细胞淋巴瘤 (CTCL) 是一类具有明显异质性的疾病,其特征是初始治疗的治愈率相对较低,复发或难治性疾病的选择有限。迄今为止,还没有获批用于治疗 PTCL 的口服疗法,而且还迫切需要更好的治疗复发或难治性 PTCL 的方案。

通过 JAK1 和/或 JAK2 的信号传导在外周 T 细胞淋巴瘤 (PTCL) 的肿瘤和非肿瘤细胞中均很常见。因此,靶向 JAK 信号通路或可为 PTCL 的治疗带来新的希望。

本研究是一项关于复发或难治性 PTCL(n=45)或蕈样真菌病(n=7)患者采用 JAK1/2 抑制剂鲁索替尼治疗的 2 期研究。根据生物标志物,受试患者被分到了三个队列:1)激活性JAK和/或 STAT 突变;2)在肿瘤细胞中有 ≥30% 的 pSTAT3 表达;3)无和不足以评估的组织。受试患者每天接受两次鲁索替尼 20mg 直到病情进展,在第2个疗程、第5个疗程以及随后每3个疗程评估一次治疗反应。主要终点是临床获益率(CBR),即完全缓解、客观缓解和疾病稳定超过6个月的总和。

不同队列和亚型的临床获益情况

7位 MF 患者中只有 1 位有临床获益(客观缓解>18个月)。在队列 1、2、3 的 PTCL 病例(n=45)中,CBR 率分别是53%、45%和13%(队列2/3与队列1相比,p=0.02)。有 8 位患者的临床获益持续超过了 12 个月,其中 4 位是 T 细胞大颗粒淋巴细胞白血病(总的有 5 位)。

不同队列的PTCL患者的治疗效果

在使用多重免疫荧光进行的探索性分析中,磷酸化 S6(一种 PI3 激酶或丝裂原活化蛋白激酶激活的标志物)的表达在 <25% 的肿瘤细胞中与对鲁索替尼治疗的反应性相关(p=0.05)。

总之,该研究表明,鲁索替尼在各种 PTCL 亚型中均具有抗肿瘤活性,提示 PTCL 患者或可采用对 JAK/STAT 抑制的精确治疗策略。

原始出处:

Alison J. Moskowitz, et al. A phase 2 biomarker-driven study of ruxolitinib demonstrates effectiveness of JAK/STAT targeting in T-cell lymphomas. Blood (2021) 138 (26): 2828–2837.

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