Triple-negative breast cancer (TNBC) is one of the more challenging types of breast cancer to treat. Because it does not express estrogen, progesterone, or HER2 receptors, many targeted therapies are not effective, and treatment options are often more limited.
New research from MD Anderson Cancer Center is helping explain why TNBC can be so resistant to treatment and what may help overcome that. Many cancer therapies work by damaging a cancer cell’s DNA. This creates stress inside the cell and is meant to lead to cell death. But TNBC cells have developed ways to survive this process. In this study, researchers found that TNBC tumors rely on an enzyme called RNase H2 to repair DNA damage and continue growing. When researchers blocked RNase H2, cancer cells were no longer able to repair that damage effectively. This led to increased stress in the tumor cells and ultimately caused them to die. At the same time, the buildup of damage triggered an immune response, helping T cells recognize and attack the cancer. Because of this dual effect, researchers describe the strategy as a “one-two punch.” It both weakens the cancer cells directly and helps activate the immune system.
The study also found that blocking RNase H2 may make existing treatments, including PARP inhibitors and ATR inhibitors, more effective. This suggests a potential path forward using combination therapies. It is important to note that this research is still in the early stages and has not yet been tested in large clinical trials.
More work is needed to understand how this approach may translate to patient care. Even so, studies like this are an important step. They help identify the specific mechanisms cancer cells use to survive, which can lead to more precise and effective treatment strategies over time.
For patients with triple-negative breast cancer, staying informed about emerging research and clinical trials can be an important part of navigating care. The Outcomes4Me app can help you better understand your diagnosis, explore treatment options, and identify clinical trials that may be relevant to you.
Personalized support for real care decisions
Understand your diagnosis, explore clinical trials, and track symptoms--all in one place.
Get started
Compare treatments, prepare for appointments, and track side effects—all in the app
Built for your diagnosis, Outcomes4Me gives you the tools to make confident, informed decisions—right when you need them.
Continue in app
