Immunotherapy Response in Pancreatic Cancer: What a New Study Reveals

Sep 11, 2025

A groundbreaking study reveals unexpected successes with immunotherapy in pancreatic cancer, challenging the norm that this treatment rarely works. It highlights rare cases of patients with positive responses, prompting a reevaluation of tumor biology and immune interactions. The research underscores the potential for personalized treatment approaches in a disease typically known for its poor prognosis and limited options.

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INSIGHT

Tumor Microenvironment Blocks Immunotherapy

Pancreatic cancer creates an immune-suppressive environment that blocks immunotherapy effectiveness.
The tumor microenvironment, not just tumor cells, drives resistance to immune-based treatments.

INSIGHT

MSI-High Is A Rare Approved Marker

Only a tiny fraction (1–2%) of pancreatic tumors are MSI-high, the current marker for approved immunotherapy use.
The study examined rare responders to checkpoint inhibitors beyond this small MSI-high group.

ANECDOTE

How Researchers Found Rare Responders

The multi-institutional case series collected 14 PDAC patients who responded well to immune checkpoint inhibitors.
Researchers found these patients by contacting 471 oncologists across 91 major U.S. cancer centers.

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Immunotherapy is not usually effective against pancreatic cancer (PC), but a new study published in Oncotarget (Volume 16, 2025) highlights rare cases where it did help. These examples, though uncommon, may offer valuable insights for future treatment. Pancreatic Cancer and Immunotherapy Pancreatic cancer is often diagnosed at an advanced stage, which limits treatment options and contributes to its poor prognosis. While chemotherapy remains the standard treatment, it usually offers only modest benefits in terms of survival. Immunotherapy—an approach that activates the immune system to fight cancer—has been effective in other cancers but has shown limited success in PC. This is largely due to the tumor’s ability to suppress immune responses and create an environment that protects it from attack. Currently, these drugs are only approved for a small subset of patients whose tumors have a specific genetic feature called high microsatellite instability (MSI-high), found in just 1 to 2 percent of cases. The Study: Pancreatic Cancer Immunotherapy Responders The study, titled “Exceptional responders to immunotherapy in pancreatic cancer: A multi-institutional case series of a rare occurrence,” was led by first author Kavin Sugumar and corresponding author Jordan M. Winter, from University Hospitals Seidman Cancer Center. The researchers examined medical records from 14 patients with pancreatic ductal adenocarcinoma (PDAC) who had responded unexpectedly well to immune checkpoint inhibitors—drugs that help reactivate immune cells to attack cancer. The drugs included PD-1 inhibitors such as pembrolizumab and nivolumab, CTLA-4 inhibitors like ipilimumab, and agents targeting tumor-associated macrophages. To find these rare cases, the research team contacted 471 oncologists from 91 major U.S. cancer centers between 2020 and 2021. Full blog - https://www.oncotarget.org/2025/09/11/immunotherapy-response-in-pancreatic-cancer-what-a-new-study-reveals/ Paper DOI - https://doi.org/10.18632/oncotarget.28739 Correspondence to - Jordan M. Winter - jordan.winter@UHHospitals.org Abstract video - https://www.youtube.com/watch?v=VeWTcuVmqgM Sign up for free Altmetric alerts about this article - https://oncotarget.altmetric.com/details/email_updates?id=10.18632%2Foncotarget.28739 Subscribe for free publication alerts from Oncotarget - https://www.oncotarget.com/subscribe/ Keywords - cancer, pancreatic adenocarcinoma, immunotherapy, exceptional responders, microsatellite instability, survival To learn more about Oncotarget, please visit https://www.oncotarget.com and connect with us: Facebook - https://www.facebook.com/Oncotarget/ X - https://twitter.com/oncotarget Instagram - https://www.instagram.com/oncotargetjrnl/ YouTube - https://www.youtube.com/@OncotargetJournal LinkedIn - https://www.linkedin.com/company/oncotarget Pinterest - https://www.pinterest.com/oncotarget/ Reddit - https://www.reddit.com/user/Oncotarget/ Spotify - https://open.spotify.com/show/0gRwT6BqYWJzxzmjPJwtVh MEDIA@IMPACTJOURNALS.COM