AACR 2023 conference booths

Scientists present potentially groundbreaking new treatments at AACR

Researchers showcased studies on targeting proteins to treat leukemia, a novel combination therapy for myelofibrosis and the role of aging in cancer

City of Hope scientists shared breakthrough research and innovative studies at this year's American Association for Cancer Research (AACR) Annual Meeting, which took place April 14 to 19 in Orlando, Florida.

Steven Rosen, M.D.
Steve Rosen, M.D.

"In addition to City of Hope providing best-in-class cancer care and treatment, we are also an incubator for innovative clinical research," said Steven T. Rosen, M.D., City of Hope provost and chief scientific officer, Irell & Manella Cancer Center Director's Distinguished Chair and Morgan & Helen Chu Director's Chair of the Beckman Research Institute. "City of Hope research presented at the AACR conference is a testament to this groundbreaking scientific research and our commitment to bringing more cures to patients."

Highlights of City of Hope research presented at the AACR conference include:

Targeting Proteins to Halt Chronic Leukemia

Yiming Wu, Ph.D., a postdoctoral fellow in the laboratory of Lili Wang, M.D., Ph.D., City of Hope associate professor in the Department of Systems Biology, presented data on chronic lymphocytic leukemia (CLL) research. His presentation, "METTL3-mediated m6A modification controls splicing factor abundance and contributes to CLL progression," outlined important findings from a paper that was published simultaneously in Blood Cancer Discovery journal.

In an effort to understand how damage to regulatory mechanisms at the molecular level contributes to the onset and progression of CLL, Wang, Wu and a team of researchers analyzed a range of molecules and proteins for clues. What they found was that METTL3, an enzyme essential to cell growth, controls splicing factors that lead to RNA splicing dysregulation — a feature common in tumors — in CLL.

"We found that higher levels of either METTL3 protein or splicing complexes are associated with poorer clinical outcomes," Wu said. "Targeting METTL3 or splicing complexes serves as a potential therapeutic target in aggressive CLL." 

CLL is one of the most common types of leukemia in adults that is rarely cured, so novel treatment options that could result from the team's findings are greatly needed, Wu added.

New Option for Myelofibrosis

Myelofibrosis is a different and rare type of blood cancer that disrupts the production of red blood cells and causes scarring in bone marrow. In a poster session, Haris Ali, M.D., City of Hope associate professor in the Division of Leukemia, Department of Hematology & Hematopoietic Cell Transplantation, presented results from "A Phase 1, open-label, dose-escalation study of selinexor plus ruxolitinib in patients with treatment-naïve myelofibrosis," which investigated a combination therapy as an upfront treatment of the disease.

In the trial, Ali and other researchers evaluated a combination of the anti-cancer drug selinexor with ruxolitinib, a chemotherapy, in patients who had not yet been treated for myelofibrosis. They found the therapy to be well-tolerated and effective at causing an early response with spleen volume reduction and symptoms improvement.

"The future of myelofibrosis for upfront treatment will be combinations like the one we've been testing for a faster, deeper and prolonged response," Ali said. "We hope over time that we will see this combination therapy prevent, or at least delay, progression of myelofibrosis."

Dual Therapy for CLL

Phase 2 of the CAPTIVATE trial is investigating the use of ibrutinib, a small molecule drug, combined with venetoclax, an anti-cancer medication. The therapy has demonstrated a deep and durable response in patients with previously untreated chronic lymphocytic leukemia (CLL) who received a fixed-duration treatment.

Tanya Siddiqi
Tanya Siddiqi, M.D.

At the AACR conference, research by Tanya Siddiqi, M.D., a City of Hope associate professor and director of the CLL program in the Division of Lymphoma, Department of Hematology & Hematopoietic Cell Transplantation, as well as the medical director of lymphoma for City of Hope Orange County, and team presented new findings from the CAPTIVATE trial in a poster session titled, "Similar outcomes regardless of post-randomization treatment with ibrutinib or ibrutinib + venetoclax in the Phase 2 CAPTIVATE study of first-line ibrutinib + venetoclax in CLL."

In the group of participants who had minimal residual disease after their initial treatment with ibrutinib plus venetoclax, patients were then randomized to either continue with the combination therapy or receive ibrutinib alone.

"We found that in patients who had minimal residual disease — or very few cancer cells in their blood — but not confirmed completely undetectable minimal residual disease, continued use of ibrutinib plus venetoclax improved rates of undetectable minimal residual disease," Siddiqi said. "However, progression-free disease and overall survival rates were similarly high in patients who continued combination therapy and those who received ibrutinib alone. Adverse event rates also generally decreased over time in both arms."

Additional Highlights:

•    Nagarajan Vaidehi, Ph.D., City of Hope professor and chair of the Department of Computational and Quantitative Medicine, chaired a symposium titled, "SY30:  Advances in Quantitative Sciences in Cancer: From Atomic Scale to Patients." From mathematics and computer science to chemistry and engineering and more, quantitative sciences play a huge role in cancer research. The goal of the symposium was to foster interdisciplinary research and collaboration across the many quantitative researchers dedicated to advancing cancer care.
•    Kimlin T. Ashing, Ph.D., City of Hope deputy director in the Division of Health Equities, received an AACR Team Science Award for her work on the African Caribbean Cancer Consortium. The award recognizes contributions that address cancer and health disparities by furthering the study of risk factors in patients of African descent.
•    Ajay Goel, Ph.D., M.S., City of Hope professor and chair of the Department of Molecular Diagnostics and Experimental Therapeutics, received the 2023 Lustgarten Foundation-Swim Across America-AACR Pancreatic Cancer Early Detection Research Grant for his study, "A Circulating Epigenetic Signature for Early Detection of Pancreatic Cancer."
•    Michael Caligiuri, M.D., president of City of Hope National Medical Center and Deana and Steve Campbell Physician-in-Chief Distinguished Chair, moderated a session called "Fostering Entrepreneurship I: Commercializing Innovative Ideas — Where to Start?" that discussed important factors to consider when exploring partnerships with industry, such as financing, licensing and tech transfer.
•    Mark LaBarge, Ph.D., City of Hope professor in the Department of Population Sciences, served as a panelist for the major symposium, "Role of Aging in Cancer." 


Pictured above: Lymphocytes attacking a cancer cell.

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