Heartbeat May Act as a Natural Shield Against Cancer, Study Reveals

New Delhi:

While cancer can affect almost every organ in the body, cases of heart cancer are extremely rare. A recent study has shed light on this mystery, raising an intriguing question—could the constant beating of the heart itself protect it from cancer?

A new study published in the prestigious journal Science offers a fascinating explanation. According to the research, the mechanical pressure generated by the heart’s continuous beating may inhibit the growth of cancer cells—at least in experiments conducted on mice.

Scientists note that tumors can develop in nearly all organs, yet primary cardiac tumors (those originating in the heart) are found in less than 1% of postmortem cases. Secondary tumors, which spread from other parts of the body, are observed in about 18% of cases involving the heart.

Until now, the reason behind the rarity of heart cancer remained unclear. James Chong from University of Sydney stated that this study provides a “strong and credible basis” for understanding the phenomenon.

The research was led by Serena Zacchigna and her team at University of Trieste. The scientists conducted a unique experiment on genetically modified mice by transplanting an additional heart outside the body (in the neck region). This external heart received blood supply but did not beat.

Cancer cells were then injected into both the normal (beating) heart and the external (non-beating) heart. Within two weeks, cancer cells grew rapidly in the non-beating heart, replacing most healthy tissue. In contrast, only about 20% of the beating heart tissue was affected.

The researchers further created engineered heart tissue in the lab using mouse heart cells. This tissue began to contract only when exposed to calcium ions, mimicking a real heartbeat.

When lung cancer cells were introduced, the results were similar:

• In non-beating tissue, cancer spread rapidly and occupied more space.
• In beating tissue, cancer cells remained limited and formed clusters only on the outer layers.

These findings suggest that the continuous motion and mechanical stress generated by the heartbeat create an unfavorable environment for cancer cells, slowing or even preventing their growth.

However, scientists caution that this research is still in its early stages and cannot yet be directly applied to humans. Even so, the discovery opens up promising possibilities for future cancer treatments, where mechanical forces or tissue movement could be used to control tumor growth.

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