Article Text

Download PDFPDF

588 Phase Ib study of the p38 inhibitor ARRY-614 with nivolumab, ipilimumab or nivolumab+ipilimumab in advanced solid tumors
  1. Ryan Augustin1,
  2. Andrew Poklepovic2,
  3. Xin Gao3,
  4. William Gooding1,
  5. Sarah Brodeur1,
  6. Julie Urban1,
  7. Amy Rose1,
  8. Amy Goodman1,
  9. Darcy Ploucha1,
  10. Roby Thomas1,
  11. Dan Zandberg1,
  12. John Kirkwood1,
  13. Yana Najjar1,
  14. Diwakar Davar1,
  15. Liza Villaruz1,
  16. Jan Beumer1,
  17. Riyue Bao1 and
  18. Jason Luke1
  1. 1UPMC Hillman Cancer Center, Pittsburgh, PA, United States
  2. 2VCU Massey Cancer Center, Richmond, VA, United States
  3. 3MGH Cancer Center, Boston, MA, United States


Background The p38 mitogen-activated protein kinase (MAPK) pathway limits dendritic cell priming and we have discovered a novel tumor-intrinsic immune-exclusion role for p38 MAPK across multiple tumor types. ARRY-614 (pexmetinib) is a p38 MAPK inhibitor that enhances immune-checkpoint blockade (ICB) in murine models. Here we report on the safety and anti-tumor activity of ARRY-614 with nivolumab (N), ipilimumab (I), or N+I in human subjects with advanced solid tumors.

Methods Subjects received daily, oral ARRY-614 (de-escalated from 800 to 200mg) with N (480 mg), I (3 mg/kg), or N+I (1 mg/kg) on either 28- or 21-day cycles. The primary objective was safety and tolerability of ARRY-614 with N, I, or N+I and selection of the recommended phase II dose (RP2D) using a Bayesian dose-finding strategy. Preliminary anti-tumor activity per RECISTv1.1 or irRECIST were secondary objectives.

Results Twenty-eight subjects were recruited (n=15 with N; including NSCLC, GEJ, RCC and mesothelioma; n=13 with I or N+I; all melanoma). Most were male (71.4%) with median age 67, three prior therapy lines, and 93% previously exposed to PD(L)1 (all meeting SITC PD(L)1 resistance definition)[1]. Treatment-related adverse events (TRAEs) were documented in all 28 subjects with 17.2% TRAEs reported as clinically significant, 9.2% grade 3, and 7.0% deemed immune-related adverse events (irAE). Eight subjects experienced dose-limiting toxicities (DLT) including rash, colitis, atrial fibrillation, hypotension, dyspnea, anaphylaxis, and visual disturbances; all in patients receiving a starting dose ≥400mg ARRY-614 and equally distributed in N vs N+I cohorts. The RP2D is 200 mg ARRY-614 with ICB and preliminary ARRY-614 PK assessment suggesting a dose-exposure relationship with DLT via area under the curve. Response was evaluable in 20 subjects (eight were nonevaluable due to toxicity or early progression) with three confirmed PRs and nine SD/irSD (figure 1). Median duration of response is not reached with two PR on-going more than 1.5 years (NSCLC: PDL1 0%, TMB 5.4 muts/Mb, prior chemotherapy + anti-PD1 / RCC: prior TKI, IL2, multiple PD(L)1 combinations). Six-month progression-free survival was achieved in six subjects including two patients with SD/irSD reaching >12 months (and three with continued benefit despite early drug cessation due to irAE; figure 2). Length of prior treatment time on most recent anti-PD(L)1 therapy did not associate with outcome. Immune monitoring and pharmacodynamic assessments are in progress.

Conclusions Inhibition of the p38 MAPK pathway with ARRY-614 is well tolerated at 200mg in combination with ICB, eliciting durable responses and disease control in poor risk and PD(L)1-refractory subjects.

Trial Registration NCT04074967


  1. Kluger HM, Tawbi HA, Ascierto ML, Bowden M, Callahan MK, Cha E, Chen HX, Drake CG, Feltquate DM, Ferris RL, Gulley JL, Gupta S, Humphrey RW, LaVallee TM, Le DT, Hubbard-Lucey VM, Papadimitrakopoulou VA, Postow MA, Rubin EH, Sharon E, Taube JM, Topalian SL, Zappasodi R, Sznol M, Sullivan RJ. Defining tumor resistance to PD-1 pathway blockade: recommendations from the first meeting of the SITC Immunotherapy Resistance Taskforce. J Immunother Cancer. 2020 Mar;8(1):e000398.

Ethics Approval This phase Ib study obtained prior ethics approval from the University of Pittsburgh Institutional Review Board (IRB: HCC#19-097). All participants gave informed consent prior to enrolling in this study.

Abstract 588 Figure 1

Best overall response.Waterfall plot depicting best overall response in all twenty evaluable subjects. (PR, partial response; SD, stable disease, irSD, immune-related stable disease; PD, progressive disease)

Abstract 588 Figure 2

Subject tumor response over timeSpider plot depicting subject tumor response from baseline over time. (PR, partial response; SD, stable disease, irSD, immune-related stable disease; PD, progressive disease)

Statistics from

Request Permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.