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2015年ASCO年會將于5月29日--6月2日在美國芝加哥召開,6月1日上午將公布Ublituximab+TGR-1202+依魯替尼聯合治療B細胞惡性腫瘤療效的試驗結果。詳情如下:
【背景】
現在出現了多種治療B細胞惡性腫瘤的新型靶向藥物,但是很少有研究成功并安全地聯合這些藥物。Ublituximab(UTX)是一種新型乙二醇工程化的單克隆抗體(mAb),以CD20抗原的獨特表位為靶點。TGR-1202(每天服用一次)是下一代PI3Kδ抑制劑,作用于復發(fā)/難治血液學惡性腫瘤患者。這項1期試驗評估了新型抗CD20 + PI3Kδ + BTK抑制劑三藥聯合治療B細胞惡性腫瘤的安全性。
【方法】
以前經治療的,患有復發(fā)/難治慢性淋巴細胞白血?。–LL)或B細胞非霍奇金淋巴瘤(NHL)且ECOG PS ≤ 2 的患者符合條件。PI3Kδ或BTK難治患者符合條件。試驗采用3+3劑量遞增設計來***評估CLL & NHL患者組的安全性和劑量限制毒性(DLT)。
UTX劑量為:第1、2療程的第1,8,15天和4,6,9,12療程的第1天劑量為900mg,TGR-1202的劑量遞增(400mg, 600mg, 800mg, 1200mg)。依魯替尼的劑量為420mg(CLL)和560mg(NHL)。通過Hallek 2008檢測其治療CLL的初始療效,通過Cheson 2007檢測其治療NHL的初始療效。
【結果】
2015年2月,研究者對10名患者評估了安全性:4例濾泡淋巴瘤(FL),3例CLL/SLL,1例邊緣帶(MZL),1例套細胞淋巴瘤(MCL)和1例里克特DLBCL.中位年齡61歲(范圍51-76);8 M/2 F;之前接受療法的中位數為3(范圍:1-4)。到當前劑量(TGR-1202:600 mg)為止未發(fā)生DLTs.
不良反應包括:腹瀉,便秘和疲勞(發(fā)生率都為30%,未發(fā)生3/4級不良反應),第一天的輸注相關反應率為20%(無3/4級),嗜中性粒細胞減少癥發(fā)生率為20%(1例3/4級)。
7名患者用于評估療效。ORR為86%,除了里克特疾病患者,其它患者都發(fā)生緩解:FL (2), CLL/SLL (2), MZL (1)和MCL(1)。第8周觀察到所有緩解,而且患者在1-5+個月持久緩解。
【結論】
至今為止,這是抗CD20,PI3Kδ和BTK抑制劑的首次聯合。UTX + TGR-1202 +依魯替尼耐受性良好,對經大量預處理的高危B細胞惡性腫瘤有早期療效。TGR-1202劑量遞增至800mg.根據三藥聯合的療效,將進行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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