Why Cancer Spreads To Lungs So Quickly?

Cancer is a serious, life-long chronic disease and can hinder one's life expectancy. While there are many regions in one's body where cancer cells can develop, however lungs are a tempting place for cancer cells. This is where more than half of people with advanced cancer elsewhere in their bodies end up with lung tumors. As per the World Cancer Research Fund, there were 2,480,675 new cases of lung cancer in 2022. As per the World Health Organization, it is the most common cancer type world wide, with 1.8 million deaths annually, accounting for 19% of all cancer deaths.

However, now the researchers may know why lung is the region prone to development of cancer cells. This is because of the elevated levels of an amino acid called aspartate which appear to allow cancer cells to grow more easily inside the lungs. This was published in the journal Nature.

We found high levels of aspartate in the lungs of mice and patients with breast cancer compared to mice and patients without cancer, which suggests that aspartate may be important for lung metastasis,” lead researcher Ginevra Doglioni, a doctoral student with the Flemish Institute for Biotechnology’s Center for Cancer Biology in Belgium, said.

How was the study conducted?

New research has uncovered a potential driver behind the aggressiveness of certain lung cancers: aspartate, an amino acid the body uses to produce proteins. The findings could pave the way for better strategies to prevent lung tumors from growing or spreading, even in advanced cancer cases.

The researchers examined tumor cells from aggressive lung tumors and discovered that aspartate plays an important role in triggering the molecular pathways that underlie cancer aggressiveness. It appears to cause a chain reaction in gene activity, increasing cancer cells' ability to adapt to their surroundings and allowing for faster tumor development.

Aspartate is ordinarily present at extremely low levels in the bloodstream, but researchers discovered unusually high amounts in the lungs of mice with metastatic breast cancer. Similar patterns were seen in human lung tumor tissues, indicating a same mechanism.

Aspartate stimulates a surface protein on cancer cells, which drives the process. This activation sets off a cascade of gene signaling events, enhancing cancer cells' capacity to grow.

Understanding this mechanism provides an important insight into why the lungs are often a vulnerable site for tumor growth, particularly in cases where cancer has spread from other parts of the body.

The good news is that there are already drugs on the market that target similar mechanisms involved in this process. Researchers believe that with further studies, these existing treatments could potentially be adapted to specifically target lung cancer driven by aspartate.

This discovery could be especially beneficial in cases where cancer has metastasized, or spread, to the lungs. By targeting the processes that make the lungs more susceptible to cancer growth, doctors might be able to develop therapies that help keep the lungs cancer-free for longer.

The findings highlight the importance of ongoing cancer research and the potential to repurpose existing treatments for new uses. As the understanding of cancer biology continues to grow, these types of discoveries could lead to more effective and personalized approaches to treating and managing aggressive cancers.