Oncotarget

BUFFALO, NY - July 18, 2025 – A new #editorial was #published in Volume 16 of Oncotarget on July 16, 2025, titled “microRNAs in soft tissue sarcoma: State of the art and barriers to translation.” In this article, Elizaveta K. Titerina, Alessandro La Ferlita, and Joal D. Beane from Ohio State University discuss the role of microRNAs in soft tissue sarcomas (STS), a rare and diverse group of cancers that begin in connective tissues, like bone or fat. The authors explain how these small molecules regulate cancer-related processes and highlight their potential as non-invasive biomarkers for diagnosis and monitoring. They also outline the main challenges that need to be addressed before microRNA-based strategies can be used in clinical settings. Soft tissue sarcomas include over 50 subtypes, making precise diagnosis and effective treatment difficult. The editorial describes how microRNAs influence cancer growth, spread, and response to therapies. Because microRNAs are stable in body fluids like blood and saliva, they could be used for early detection and to help guide treatment decisions. Such as, certain groups of microRNAs are linked to how patients respond to specific drugs, showing their potential as tools for precision medicine. “For example, miR-17-92 and miR-106b-25 clusters have been associated with sensitivity or resistance to eribulin in STS.” The authors also explain that microRNAs could help distinguish between tumor types that are often difficult to differentiate, such as benign lipomas and malignant liposarcomas. Recognizing these differences is crucial for guiding treatment decisions. Specific patterns of microRNA expression in blood samples may enable clinicians to make quicker and more reliable diagnoses without the need for invasive procedures. Beyond their diagnostic role, microRNAs are also being explored as therapeutic tools, but applying microRNA-based therapies to patients remains challenging. These molecules can act as either cancer promoters or suppressors, depending on the environment, which complicates the development of safe and targeted treatments. However, new delivery methods such as lipid nanoparticles show promise in improving precision and safety. Overall, microRNAs are emerging as an important focus in STS research, offering new possibilities for advancing diagnosis, prognosis, and treatment. As researchers continue to address the current challenges, these small molecules could become valuable tools in improving cancer care. DOI - https://doi.org/10.18632/oncotarget.28754 Correspondence to - Joal D. Beane, joal.beane@osumc.edu Video short - https://www.youtube.com/watch?v=MlLGA8BObPQ Sign up for free Altmetric alerts about this article - https://oncotarget.altmetric.com/details/email_updates?id=10.18632%2Foncotarget.28754 Subscribe for free publication alerts from Oncotarget - https://www.oncotarget.com/subscribe/ Keywords - cancer, soft tissue sarcoma, liposarcoma, microRNA, small non-coding RNA, cancer biomarkers 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

BUFFALO, NY - July 16, 2025 – A new #research paper was #published in Volume 16 of Oncotarget on July 9, 2025, titled “A novel anti-human CD25 mAb with preferential reactivity to activated T regulatory cells depletes them from the tumor microenvironment.” In this study, researchers from the National Institute of Allergy and Infectious Diseases, led by first author Maja Buszko and corresponding author Ethan M. Shevach, discovered a new monoclonal antibody that selectively targets a subset of immune cells called regulatory T cells (Tregs). These cells, while normally important for preventing autoimmunity, also can block the body’s ability to fight cancer by suppressing anti-tumor immune responses. This discovery could lead to novel cancer therapies that strengthen the immune system’s capacity to attack tumors. The researchers identified an anti-CD25 monoclonal antibody with several atypical properties and named it 2B010. To evaluate its effects, they used humanized mice, laboratory mice that are engineered to carry human immune cells, to closely mimic how human immune systems respond to cancer. The treatment of these mouse models with 2B010 significantly decreased the number of Tregs in tumors and boosted the activity of CD8+ T cells, which are essential for killing cancer cells. Importantly, 2B010 worked without disrupting other key immune functions. Unlike traditional Anti-CD25 antibodies, it did not interfere with interleukin-2 (IL-2) signaling, which is essential for the growth and activity of effector T cells that fight cancer. “2B010 also had no effect on IL-2 induced STAT5 phosphorylation or CD4+ T cell proliferation in vitro while both were blocked by Clone D1 further supporting the view that 2B010 does not recognize the IL-2 binding site.” This finding is especially significant because high levels of Tregs in tumors are associated with poor outcomes in many cancers. By specifically removing these cells, 2B010 may help overcome one of the main barriers to current immunotherapy approaches. Its ability to preserve IL-2 signaling could also make it safer and more effective when used alone or in combination with existing therapies such as immune checkpoint inhibitors. While the 2B010 antibody showed strong effects in reducing Tregs and boosting immune cell activity, the study did not observe changes in tumor size in these models. Researchers suggest this may be due to limitations in the preclinical systems used, such as the lack of tumor-specific T cells in humanized mice. Nevertheless, these findings demonstrate that 2B010 has a unique mechanism of action that could complement other cancer immunotherapies in future clinical trials. In conclusion, the development of 2B010 is a promising step toward selectively disrupting the immune suppressive environment in tumors. As researchers continue to refine and test this antibody, it could become a powerful tool for enhancing the effectiveness of cancer treatments and improving outcomes for patients. DOI - https://doi.org/10.18632/oncotarget.28752 Correspondence to - Ethan M. Shevach - eshevach@Niaid.NIH.gov Video short - https://www.youtube.com/watch?v=2NJcGsI7WXA Sign up for free Altmetric alerts about this article - https://oncotarget.altmetric.com/details/email_updates?id=10.18632%2Foncotarget.28752 Subscribe for free publication alerts from Oncotarget - https://www.oncotarget.com/subscribe/ Keywords - cancer, Treg, CD25, TME, mAb, GVHD 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

Scientists have uncovered a promising new strategy to weaken cancer cells’ natural defense mechanisms, potentially making chemotherapy more effective. In a study published in Volume 16 of Oncotarget, researchers identified the protein PRDX1 as a key player in helping tumors resist treatment. By targeting this protein, they propose a novel way to combat aggressive, treatment-resistant cancers. Understanding Why Some Cancers Resist Treatment Chemotherapy works by damaging the DNA of cancer cells, forcing them to self-destruct. However, many cancers develop robust repair systems that fix this damage, allowing the tumor to survive and grow. A central component of this repair machinery is a protein called ATM, which acts like a first responder in the cell, detecting DNA damage and coordinating its repair. In ovarian cancer and other aggressive tumors, high levels of ATM have been associated with poor survival rates and resistance to chemotherapy. The Study: How PRDX1 Protects Cancer Cells The study, titled “PRDX1 protects ATM from arsenite-induced proteotoxicity and maintains its stability during DNA damage signaling,” was led by first author Reem Ali and corresponding author Dindial Ramotar from Hamad Bin Khalifa University in Qatar, in collaboration with researchers from the University of Nottingham in the UK. Full blog - https://www.oncotarget.org/2025/07/14/prdx1-identified-as-key-to-chemotherapy-resistance-in-cancer-cells/ Paper DOI - https://doi.org/10.18632/oncotarget.28720 Correspondence to - Dindial Ramotar - dramotar@hbku.edu.qa Video short - https://www.youtube.com/watch?v=suOhF7mPlNQ Sign up for free Altmetric alerts about this article - https://oncotarget.altmetric.com/details/email_updates?id=10.18632%2Foncotarget.28720 Subscribe for free publication alerts from Oncotarget - https://www.oncotarget.com/subscribe/ Keywords - cancer, redox signaling, homologous recombination, protein interaction, cell cycle, protein modification 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

BUFFALO, NY – July 14, 2025 – A new #research paper was #published in Volume 16 of Oncotarget on June 25, 2025, titled “Hypoxia induced lipid droplet accumulation promotes resistance to ferroptosis in prostate cancer.” In this study, researchers led by Shailender S. Chauhan and Noel A. Warfel from the University of Arizona discovered that prostate cancer cells survive treatment by storing fats in tiny cellular compartments when oxygen levels are low. This process makes the cancer cells less vulnerable to a type of cell death known as ferroptosis. The findings provide new insight into why prostate tumors often resist therapies and suggest potential strategies to improve treatment outcomes. This study focused on ferroptosis, a form of programmed cell death that relies on iron and lipid oxidation to destroy cancer cells. Researchers tested prostate cancer cells under normal and low oxygen conditions and found that hypoxia, or reduced oxygen levels, allowed cancer cells to build up lipid droplets (LD). These structures act as storage units for fats, shielding cancer cells from oxidative damage and preventing ferroptosis from occurring. The researchers found that this adaptation of prostate cancer cells made them less sensitive to ferroptosis-inducing drugs like Erastin and RSL3, even when these drugs were combined for a stronger effect. The team also reported that hypoxia caused significant changes in lipid metabolism, decreasing the availability of specific fatty acids that normally promote ferroptosis. “Transcriptomic analysis revealed that hypoxia significantly reduced the expression of genes related to incorporating polyunsaturated fatty acids into phospholipids (ACSL4, LPCAT3), and parallel lipidomic analysis demonstrated that hypoxia significantly decreased the levels of the ferroptosis-prone lipid class, phosphatidylethanolamine (PE) and increased production of neutral lipid species, cholesteryl ester (ChE (22:5)) and triglycerides (TG(48:1), TG:(50:4), and TG(58:4)).” This research highlights the importance of the tumor microenvironment, particularly oxygen levels, in shaping how cancer cells respond to therapy. By altering their metabolism and storing lipids, prostate tumors may evade treatments designed to trigger ferroptosis. These findings underscore the need to develop new strategies targeting LD dynamics or lipid metabolism to overcome this resistance. Understanding how prostate cancer (Pca) adapts to survive in hypoxic conditions offers a potential avenue for improving therapies. For example, preventing lipid accumulation in cancer cells or releasing stored fats may restore their sensitivity to ferroptosis and improve the effectiveness of current therapies. This approach could have broader implications for treating other solid tumors that share similar metabolic features. DOI - https://doi.org/10.18632/oncotarget.28750 Correspondence to - Noel A. Warfel - warfelna@arizona.edu, and Shailender S. Chauhan - shailenderc@arizona.edu Video short - https://www.youtube.com/watch?v=xFypDT4ALmc Sign up for free Altmetric alerts about this article - https://oncotarget.altmetric.com/details/email_updates?id=10.18632%2Foncotarget.28750 Subscribe for free publication alerts from Oncotarget - https://www.oncotarget.com/subscribe/ Keywords - cancer, hypoxia, lipid droplets, ferroptosis, resistance, prostate 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

BUFFALO, NY – July 9, 2025 – A new #review was #published in Volume 16 of Oncotarget on June 25, 2025, titled “Challenges and resistance mechanisms to EGFR targeted therapies in head and neck cancers and breast cancer: Insights into RTK dependent and independent mechanisms.” Researchers from the University of Cincinnati and Cincinnati Veterans Affairs Medical Center reviewed current research on why Epidermal Growth Factor Receptor (EGFR)-targeted therapies often fail in breast and head and neck cancers. The article by Shreya Shyamsunder, Zhixin Lu, Vinita Takiar, and Susan E. Waltz explores how cancer cells evade these treatments by activating alternative survival pathways. This review offers an in-depth look at the molecular barriers to EGFR inhibition and provides insights that could inform the development of more effective and durable treatments. EGFR is a critical protein that regulates cell growth and survival, and it is frequently overexpressed in breast and head and neck cancers. Although therapies targeting EGFR showed early promise, resistance has become a significant challenge. In breast cancer, resistance mechanisms include the movement of EGFR from the cell surface into the nucleus, where it promotes DNA repair, as well as ligand-dependent activation that helps tumor growth despite therapy. In head and neck cancers, resistance often arises from inflammatory signaling through the TLR4-MyD88 pathway and the loss of tumor suppressor genes like PTEN, which allow cancer cells to bypass EGFR inhibition. The review also describes how tumor cells in both cancers commonly activate other receptor tyrosine kinases (RTKs), such as MET, AXL, and RON, to continue growing even when EGFR is blocked. By analyzing these resistance mechanisms, the authors highlight combination therapies from current research that target EGFR and other key molecular pathways. Strategies such as dual inhibition of EGFR and MET or blocking inflammation-driven survival signals may enhance treatment outcomes. Several clinical trials are evaluating these approaches in patients. For example, in breast cancer, combinations of EGFR inhibitors with chemotherapy and immune checkpoint inhibitors are being tested to improve responses, particularly in triple-negative breast cancer. In head and neck cancers, trials are investigating EGFR-blocking antibodies like cetuximab combined with immunotherapies such as pembrolizumab and nivolumab. These efforts aim to overcome resistance and provide more effective treatment options for patients with EGFR-driven tumors. The review also emphasizes the necessity of identifying biomarkers to predict which patients are most likely to benefit from EGFR-based therapies. “A recent phase 1 study has shown that patients with recurrent or metastatic head and neck cancer who received BCA101, a bifunctional dual targeting drug that targets EGFR and TGF-β in combination with pembrolizumab, were able to achieve an overall response rate of 65%.” This work brings together current knowledge about EGFR resistance and illustrates the difficulties involved in treating breast and head and neck cancers. By mapping the many ways tumors overcome EGFR inhibition, the review highlights opportunities for more tailored and effective treatments in the future. DOI - https://doi.org/10.18632/oncotarget.28747 Correspondence to - Susan E. Waltz - susan.waltz@uc.edu, and Vinita Takiar - takiarva@ucmail.uc.edu Video short - https://www.youtube.com/watch?v=RD2W-F3_aX4 About Oncotarget: Website - https://www.oncotarget.com 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