Chemotherapy is always the first option doctors rely on while treating your cancer. It’s used to stop cancer cells from spreading to your other healthy organs. But sometimes, it doesn’t eliminate all the cancerous cells from your body. Some of these cancer cells remain and adapt to the treatment environment of your body. This makes them even stronger and more dangerous for you when the cancer returns.

How do cancer cells adapt to the treatment?

Cancer cells never stay static and evolve with time. During your chemotherapy, the most vulnerable cells are destroyed, but a small group may survive. This small group of cancerous cells carries genetic changes that allow them to mature and mutate further in your body. Over time, these cancer cells stop responding to your treatment drugs and spread to different parts of your body. This therapy resistance is what makes cancer relapse harder to treat.

Cancer cells that survive

In the early stages, your scans may not show visible tumors, as the cancer cells live in tiny clusters. This is also called minimal residual disease. Stem-like cells are also part of these surviving cancerous cells that are small but regrow on their own and can spread aggressively in your body. These cancerous cells stay low during your treatment days, which makes it even harder to destroy them. This is how you face a more aggressive relapse even after a successful chemotherapy treatment in the beginning.

How does chemotherapy affect the surrounding tissue?

Cancer never grows in isolation in your body. It is surrounded by your blood vessels, immune cells, and other supportive tissues nearby. This is also known as the tumor microenvironment. This is why chemotherapy doesn’t just destroy cancer cells; it also affects this microenvironment. Sometimes, you may also experience treatment-related inflammation or slight tissue changes, which help cancer cells to grow and even hide.

Moving forward 

It is easy to assume that your treatment failed if cancer bounces back. It is important to know that cancer is complex, and relapse in some cases is quite common. But modern-day therapies and innovations have made it possible to prevent the relapse, so you could regain your quality of life.