Understanding the Science

Cancer is one of the leading causes of death worldwide. Traditionally, doctors diagnose cancer through tissue biopsies, where a small sample of tissue is removed from the body and examined in a laboratory. While effective, this procedure can be invasive, painful, and difficult to repeat frequently.

Liquid biopsy is a newer diagnostic technique that detects cancer-related materials, such as circulating tumour DNA (ctDNA), in a patient’s blood sample. As cancer cells grow and die, they release tiny fragments of genetic material into the bloodstream. Scientists can analyse these fragments to identify genetic mutations associated with specific cancers.

Because only a blood sample is needed, liquid biopsies are less invasive and can be performed more regularly than traditional tissue biopsies.

Real-World Applications

Liquid biopsy technology is increasingly being used to detect cancer at earlier stages, monitor how well treatments are working, and identify whether cancer has returned after treatment.

For example, patients undergoing cancer therapy can have regular blood tests to monitor tumour DNA levels. If the amount of tumour DNA decreases, it may indicate that the treatment is working. Conversely, rising levels could alert doctors to possible disease progression, allowing treatment plans to be adjusted promptly.

Researchers are also exploring how liquid biopsies can be used in large-scale cancer screening programmes to detect cancers before symptoms appear, potentially improving survival rates.

My Reflection

Learning about liquid biopsies showed me how biomedical science combines biology, genetics, and technology to improve patient care. I was fascinated that a simple blood sample could provide valuable information about a disease as complex as cancer.

This topic is particularly meaningful to me because I have seen my grandmother undergo cancer treatment. Understanding how scientists develop new methods to detect and monitor cancer helped me appreciate the important role biomedical researchers play in healthcare.

Researching this topic strengthened my interest in Biomedical Science and inspired me to learn more about how innovative diagnostic technologies can improve patients’ lives in the future.