2015年ASCO年会将于5月29日--6月2日在美国芝加哥召开,6月1日上午将公布Ublituximab+TGR-1202+依鲁替尼联合治疗B细胞恶性肿瘤疗效的试验结果。详情如下:
【背景】
现在出现了多种治疗B细胞恶性肿瘤的新型靶向药物,但是很少有研究成功并安全地联合这些药物。Ublituximab(UTX)是一种新型乙二醇工程化的单克隆抗体(mAb),以CD20抗原的独特表位为靶点。TGR-1202(每天服用一次)是下一代PI3Kδ抑制剂,作用于复发/难治血液学恶性肿瘤患者。这项1期试验评估了新型抗CD20 + PI3Kδ + BTK抑制剂三药联合治疗B细胞恶性肿瘤的安全性。
【方法】
以前经治疗的,患有复发/难治慢性淋巴细胞白血病(CLL)或B细胞非霍奇金淋巴瘤(NHL)且ECOG PS ≤ 2 的患者符合条件。PI3Kδ或BTK难治患者符合条件。试验采用3+3剂量递增设计来***评估CLL & NHL患者组的安全性和剂量限制毒性(DLT)。
UTX剂量为:第1、2疗程的第1,8,15天和4,6,9,12疗程的第1天剂量为900mg,TGR-1202的剂量递增(400mg, 600mg, 800mg, 1200mg)。依鲁替尼的剂量为420mg(CLL)和560mg(NHL)。通过Hallek 2008检测其治疗CLL的初始疗效,通过Cheson 2007检测其治疗NHL的初始疗效。
【结果】
2015年2月,研究者对10名患者评估了安全性:4例滤泡淋巴瘤(FL),3例CLL/SLL,1例边缘带(MZL),1例套细胞淋巴瘤(MCL)和1例里克特DLBCL.中位年龄61岁(范围51-76);8 M/2 F;之前接受疗法的中位数为3(范围:1-4)。到当前剂量(TGR-1202:600 mg)为止未发生DLTs.
不良反应包括:腹泻,便秘和疲劳(发生率都为30%,未发生3/4级不良反应),第一天的输注相关反应率为20%(无3/4级),嗜中性粒细胞减少症发生率为20%(1例3/4级)。
7名患者用于评估疗效。ORR为86%,除了里克特疾病患者,其它患者都发生缓解:FL (2), CLL/SLL (2), MZL (1)和MCL(1)。第8周观察到所有缓解,而且患者在1-5+个月持久缓解。
【结论】
至今为止,这是抗CD20,PI3Kδ和BTK抑制剂的首次联合。UTX + TGR-1202 +依鲁替尼耐受性良好,对经大量预处理的高危B细胞恶性肿瘤有早期疗效。TGR-1202剂量递增至800mg.根据三药联合的疗效,将进行II期研究。
英文摘要:
Safety and activity of the chemotherapy-free t**let of ublituximab, TGR-1202, and ibrutinib in relapsed B-cell malignancies. (Abstract No: 8501)Session Type:Oral Abstract Session
Background: Multiple novel targeted agents are emerging for B-cell malignancies, but few studies have successfully and safely combined these agents. Ublituximab (UTX) is a novel glycolengineered mAb targeting aunique epitope on the CD20 antigen. TGR-1202 is a next generation, once daily,PI3Kδ inhibitor, active in patients (pts) with rel/ref hematologic malignancies (Burris, 2014)。 This Ph 1 trial evaluates the safety of the first t**let combination of a novel anti-CD20 + PI3Kδ + BTK inhibitor in pts with B-cell malignancies.
Methods: Eligible pts had rel/ref CLL (including Richter's) or B-cell NHL with an ECOG PS ≤ 2 w/o limit to number of prior therapies. Pts refractory to prior PI3Kδ or BTK were eligible. CLL & NHL cohorts were evaluated independently in a 3+3 dose escalation design to evaluate safety and dose limiting toxicities (DLT)。 UTX was dosed at 900mg on D1, 8, 15 of Cyc 1 & 2 and D 1 on Cyc 4, 6, 9 & 12. TGR-1202 was dose escalated (400mg, 600mg, 800mg, 1200mg)。 Ibrutinib was dosed at 420mg (CLL) and 560mg (NHL)。 Preliminary efficacy was examined (CLL per Hallek 2008 / NHL perCheson 2007)。
Results: As of Feb 2015, 10 pts were evaluable for safety: 4 follicular (FL), 3 CLL/SLL, 1 marginal zone (MZL), 1 mantle cell(MCL) and 1 Richter's DLBCL. Med age 61 yo (range 51-76); 8 M/2 F; median prior Tx = 3 (range 1-4)。 No DLTs have occurred up to the current dose (600 mgTGR-1202)。 AEs (all causality) included: diarrhea, constipation and fatigue(30% each, no G 3/4), Day 1 infusion related reactions at 20% (no G 3/4) and neutropenia at 20% with 1 event G 3/4. 7 pts were evaluable for efficacy. ORRwas 86% with all pts except the Richter's responding (FL (2), CLL/SLL (2), MZL(1) and MCL (1))。 All responses were observed by week 8 (1 CR / 5 PR's)。 Patients remain on study from 1 – 5+ months.
Conclusions: To date, this is the first combination of ananti-CD20, a PI3Kδ and a BTK inhibitor. UTX + TGR-1202 + ibrutinb was well tolerated with significant early activity across heavily pre-treated and high-risk B-cell malignancies. Dose escalation continues with TGR-1202 at 800mg. Based upon the early activity of the t**let, Ph II studies are planned.
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