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Key Takeaways

• Tumor metabolism describes how cancer cells reprogram normal metabolic processes to generate the energy and materials needed for rapid growth and survival.
• Cancer starvation strategies aim to slow tumor progression by disrupting the metabolic pathways and nutrient supplies that malignant cells depend upon.
• Key metabolic processes such as the Warburg effect, glutamine dependence, and macronutrient scavenging present promising targets for emerging cancer therapies.
• Targeted treatments including antimetabolic drugs and angiogenesis inhibitors seek to interfere with tumor growth while complementing existing cancer therapies.
• Ongoing research into engineered cells and metabolic interventions continues to expand the potential for innovative, targeted approaches to cancer treatment.

Jeff Geschwind, MD, is a physician-scientist and internationally recognized expert in liver cancer and interventional oncology with more than 25 years of experience in clinical care, research, and medical leadership. He currently serves as Medical Director of Oncology, Image-Guided Therapy, and Imaging Core Lab at NAMSA, where he oversees imaging protocols used as clinical trial endpoints. Dr. Geschwind is also a Medical Advisor for HistoSonics, a member of the Scientific Advisory Board of New Phase, a consultant to Cage Pharma, and a scientific consultant to Philips Healthcare. Throughout his career, he has contributed to advances in cancer treatment, imaging, and clinical research, including innovations that improved the visualization and treatment of liver tumors.

Given his longstanding focus on oncology and gastrointestinal malignancies, the topic of tumor metabolism and emerging cancer starvation strategies reflects an area of active scientific interest within the broader effort to develop new approaches to cancer care.

Understanding Tumor Metabolism and Emerging Cancer Starvation Strategies

A tumor, or neoplasm, is a solid tissue growth that forms when a group of abnormal cells clusters together. Tumors can appear anywhere in the body, including organs, bones, skin, and glands. Many different types of tumors exist, and medical professionals use a variety of classifications to describe tumor growth, size, and locations, though the broadest tumor categorizations are benign (meaning the growth is non-cancerous) and malignant (meaning the tumor is cancerous and requires medical treatment).

Oncology specialists and other health care providers approach malignant tumors using a diversity of techniques and therapeutic strategies. Common options include chemotherapy, radiation therapy, immunotherapy, and targeted therapy. In some cases, surgeons can physically remove the tumors from the body. Alternatively, cancer treatment teams may attempt to starve cancer cells by cutting off the tumor’s fuel source.

To understand how this treatment works, one must first familiarize themselves with the basics of tumor metabolism. The term “tumor metabolism” refers to the complex metabolic networks cancer cells reprogram to satisfy their high energy and biosynthetic needs. The fact that cancer cells grow rapidly and can quickly spread through the body via a process known as metastasis has been known for decades. To do so, cancer cells require a large and consistent source of energy.

Tumor metabolism consists of many unique components and processes, including the Warburg effect, glutamate addiction, and macronutrient scavenging. The Warburg effect, also known as aerobic glycolysis, describes cancer cells’ preference for glycolysis, a metabolic process that involves breaking down glucose into two distinct molecules, including lactate. Typically, glycolysis occurs in biological systems lacking in oxygen, but cancer cells prefer glycolysis even when oxygen is plentiful. By producing lactate, cancer cells rapidly generate the building blocks needed for unregulated cellular growth.

Glutamine addiction is another important aspect of tumor metabolism. In addition to their dependency on glucose, tumor cells rely on glutamine, an amino acid, as a source of carbon and nitrogen. Glutamine enables tumor cells to undergo rapid division without suffering from oxidative stress.

Finally, macronutrient scavenging is one of many unconventional elements of tumor metabolism that occurs in nutrient-deprived environments. Through this process, cancer cells acquire lipids, proteins, and other valuable nutrients from their surroundings. Macronutrient scavenging is closely related to autophagy, the process of recycling a tumor cell’s own organelles and cytoplasmic molecules and converting them into usable energy.

As physicians, oncologists and researchers gain a better understanding of tumor metabolism, they can attack these processes and prevent cancer cells from accessing the energy they need to thrive. Cancer starvation is an emerging approach to cancer treatment designed to interfere with the unique metabolic pathways that facilitate cancer growth. Various antimetabolic therapies, for example, introduce drugs into the body that limit the effectiveness of specific cancer processes, including the Warburg effect.

Angiogenesis inhibitors, meanwhile, are a family of targeted drugs that stop tumor cells from building their own blood vessels, which effectively provides the tumors with a limitless supply of nutrients. By hindering this process, tumor growth can be slowed if not completeky stopped.

Engineered fat cells have also shown potential when it comes to starving tumors. Pre-clinical studies from the University of California, San Francisco, indicate that gene editing can produce special fat cells that, when placed directly alongside tumors, rapidly absorb the fatty acids and glucose the tumors use for glycolysis and other fundamental growth processes.

FAQs

What is tumor metabolism?

Tumor metabolism refers to the altered biochemical processes that allow cancer cells to produce energy and build new cellular components more rapidly than normal cells. These metabolic adaptations help tumors grow, spread, and survive even under challenging conditions.

What is cancer starvation therapy?

Cancer starvation therapy is an emerging treatment approach that seeks to deprive tumors of the nutrients and metabolic pathways they need to survive. Rather than directly killing cancer cells, these strategies focus on disrupting the fuel sources that support tumor growth.

Why is the Warburg effect important in cancer research?

The Warburg effect describes the tendency of many cancer cells to rely on glycolysis for energy production even when oxygen is readily available. Understanding this unique metabolic behavior has led researchers to investigate therapies that specifically target cancer cell metabolism.

How do angiogenesis inhibitors help treat cancer?

Angiogenesis inhibitors work by preventing tumors from developing new blood vessels that supply oxygen and nutrients. By limiting a tumor’s blood supply, these drugs can slow growth and improve the effectiveness of other cancer treatments.

Are cancer starvation strategies currently replacing chemotherapy?

No. Cancer starvation approaches are generally being studied as complementary therapies rather than direct replacements for established treatments such as chemotherapy, radiation therapy, immunotherapy, or surgery. Ongoing clinical research continues to evaluate their safety, effectiveness, and potential role in future cancer care.

About Jeff Geschwind

Jeff Geschwind, MD, is Medical Director of Oncology, Image-Guided Therapy, and Imaging Core Lab at NAMSA and a recognized leader in interventional oncology. He also serves as Medical Advisor to HistoSonics, advises Philips Healthcare, consults for Cage Pharma, and serves on the Scientific Advisory Board of New Phase. A former professor and department chair at Yale University School of Medicine and longtime leader at Johns Hopkins, he has authored nearly 300 scientific publications and contributed to numerous advances in liver cancer research and treatment.