A randomized phase 2 trial of pembrolizumab versus pembrolizumab and acalabrutinib in patients with platinum-resistant metastatic urothelial cancer.

Abstract

BACKGROUND:Inhibition of the programmed cell death protein 1 (PD-1) pathway has demonstrated clinical benefit in metastatic urothelial cancer (mUC); however, response rates of 15% to 26% highlight the need for more effective therapies. Bruton tyrosine kinase (BTK) inhibition may suppress myeloid-derived suppressor cells (MDSCs) and improve T-cell activation. METHODS:The Randomized Phase 2 Trial of Acalabrutinib and Pembrolizumab Immunotherapy Dual Checkpoint Inhibition in Platinum-Resistant Metastatic Urothelial Carcinoma (RAPID CHECK; also known as ACE-ST-005) was a randomized phase 2 trial evaluating the PD-1 inhibitor pembrolizumab with or without the BTK inhibitor acalabrutinib for patients with platinum-refractory mUC. The primary objectives were safety and objective response rates (ORRs) according to the Response Evaluation Criteria in Solid Tumors, version 1.1. Secondary endpoints included progression-free survival (PFS) and overall survival (OS). Immune profiling was performed to analyze circulating monocytic MDSCs and T cells. RESULTS:Seventy-five patients were treated with pembrolizumab (n = 35) or pembrolizumab plus acalabrutinib (n = 40). The ORR was 26% with pembrolizumab (9% with a complete response [CR]) and 20% with pembrolizumab plus acalabrutinib (10% with a CR). The grade 3/4 adverse events (AEs) that occurred in ≥15% of the patients were anemia (20%) with pembrolizumab and fatigue (23%), increased alanine aminotransferase (23%), urinary tract infections (18%), and anemia (18%) with pembrolizumab plus acalabrutinib. One patient treated with pembrolizumab plus acalabrutinib had high MDSCs at the baseline, which significantly decreased at week 7. Overall, MDSCs were not correlated with a clinical response, but some subsets of CD8+ T cells did increase during the combination treatment. CONCLUSIONS:Both treatments were generally well tolerated, although serious AE rates were higher with the combination. Acalabrutinib plus pembrolizumab did not improve the ORR, PFS, or OS in comparison with pembrolizumab alone in mUC. Baseline and on-treatment peripheral monocytic MDSCs were not different in the treatment cohorts. Proliferating CD8+ T-cell subsets increased during treatment, particularly in the combination cohort. Ongoing studies are correlating these peripheral immunome findings with tissue-based immune cell infiltration.

Department

Description

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Citation

Published Version (Please cite this version)

10.1002/cncr.33067

Publication Info

Zhang, Tian, Michael R Harrison, Peter H O'Donnell, Ajjai S Alva, Noah M Hahn, Leonard J Appleman, Jeremy Cetnar, John M Burke, et al. (2020). A randomized phase 2 trial of pembrolizumab versus pembrolizumab and acalabrutinib in patients with platinum-resistant metastatic urothelial cancer. Cancer, 126(20). pp. 4485–4497. 10.1002/cncr.33067 Retrieved from https://hdl.handle.net/10161/21775.

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Scholars@Duke

Zhang

Tian Zhang

Adjunct Associate Professor in the Department of Medicine
Harrison

Michael Roger Harrison

Associate Professor of Medicine
Chan

Chi Wei Cliburn Chan

Professor of Biostatistics & Bioinformatics

Computational immunology (stochastic and spatial models and simulations, T cell signaling, immune regulation)
Statistical methodology for immunological laboratory techniques (flow cytometry, CFSE analysis, receptor-ligand binding and signaling kinetics)
Informatics of the immune system (reference and application ontologies, meta-programming, text mining and machine learning)

Weinhold

Kent James Weinhold

Joseph W. and Dorothy W. Beard Distinguished Professor of Experimental Surgery

The Weinhold Laboratory is currently focused on utilizing a comprehensive repertoire of highly standardized and formerly validated assay platforms to profile the human immune system in order to identify immunologic signatures that predict disease outcomes. These ongoing studies span a broad range of highly relevant clinical arenas, including: 1) cancer (non-small cell lung cancer, head and neck cancer, glioblastoma neoforme, ovarian cancer, and prostate cancer), 2) autoimmune diseases (rheumatoid arthritis, systemic lupus erythematosis, multiple sclerosis, and myasthenia gravis), 3) pulmonary disease (idiopathic pulmonary fibrosis), 4) solid organ transplantation (lung, kidney, liver, and heart), and 5) inflammatory disorders.

Two of the areas that have been especially active over the past few years include the comprehensive immunologic profiling of cancer patients receiving so-called ‘immune checkpoint blockade’ therapies and the search for immune signatures in lung transplant recipients that track with resistance to CMV infection. The laboratory conducted immune monitoring studies associated with a Phase I trial of Ipilimumab (anti-CTLA-4) in a neoadjuvant setting for the treatment of non-small cell lung cancer (NSCLC). For this trial we extensively utilized several high parameter flow cytometry (PFC) platforms to follow activation, maturation, exhaustion, and proliferation patterns within CD4+ and CD8+ subsets of T-cells. We are also utilizing an intracellular cytokine staining (ICS) platform in efforts to detect anti-tumor associated antigen (TAA) responses by CD4+ and CD8+ T cells from peripheral blood mononuclear cells as well as lymphocytes infiltrating the patients’ tumor. These assays are designed to measure antigen-driven intracellular production of IFN-γ, TNF-α, and IL-2, as well as the degranulation marker CD107a. This strategy enables us to not only document individual cytokine responses, but to also assess (through Boolean gating) changes in relative polyfunctionality of the responses. We have also performed similar immune monitoring of a Phase II trial evaluating nivolumab (anti-PD-1) alone vs. combined nivolumamb + ipilimumab vs. avastin (bevacizamab) alone in patients with glioblastomas. In both studies, we are seeking to identify pharmacodynamics markers and immune correlates predictive of clinical responses. In completed studies of a cohort of lung transplant recipients, we identified specific polyfunctional signatures in CD4+ and CD8+ subsets against CMV pp65 and IE-1 antigens that tracked with resistance to CMV infection (manuscript in preparation). These findings now serve as the basis for a Phase I clinical trial to compare conventional 6-month chemoprophylaxis in lung transplant recipients versus a regimen dictated by the presence or absence of the predictive signatures. This trial is the principal component of a recently awarded Clinical Trials in Organ Transplantation or CTOT award made from the NIH to Duke (Scott Palmer, PI). Ongoing studies will test the hypothesis that these signatures that have been validated in lung transplant recipients will also predict resistance to CMV infection in the context of other solid organ transplants such as kidney, liver, and heart.Future studies will also attempt to identify predictive signatures for resistance to BK polyomavirus, the cause of graft threatening nephritis in kidney transplant recipients and cystitis in bone marrow transplant recipients.  

 

Recent publications


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