Cancer is defined in the National Institute of Korean Language's Standard Korean Dictionary as "a disease in which cells proliferate without limit within living tissue, causing malignant tumors." In other words, to treat cancer, one must either eliminate the cells so they cannot proliferate, or limit and control their unlimited proliferation. The representative methods for eliminating a malignant tumor that has already grown through unlimited proliferation are surgery and radiation therapy. Methods for effectively limiting the growth of cancer cells, which seek to proliferate continuously without stopping, include cytotoxic chemotherapy and targeted therapies. Targeted therapies and cancer immunotherapy, which have recently drawn attention for their groundbreaking effects, work by blocking the fundamental mechanisms through which cancer cells attempt to proliferate without limit.
Recalling my memories from medical school, cancer was not treated with much weight in the immunology course I took over one semester. Even so, I vividly remember my professor at the time saying, "Someday, a time may come when cancer too can be overcome using immune mechanisms." Of course, back then, I never imagined that cancer immunotherapy would establish itself as a new paradigm in cancer treatment. Countless researchers have devoted themselves to identifying the mechanisms behind cancer's development and immune evasion, and this has led to the meaningful fruit of cancer immunotherapy. Looking back on this, one comes to realize that progress in cancer treatment ultimately begins with how deeply we understand cancer. The better we understand cancer, the closer we can get to better treatments.
While it is clear that the path of our knowledge about cancer has grown far deeper than in the past, there is still a long way to go. The fact that cancer is something that occurs within the body of a living person is cited as yet another hidden obstacle. Every person has a different body. Even when cancer of the same tissue type arises in the same organ, it takes on entirely different forms depending on an individual's physical and genetic characteristics. Many medical staff face difficulty at this point. For example, even when lung cancer of the same shape and tissue type is treated with the same drug, some patients show excellent treatment effects while others show almost no response. The degree to which patients endure the side effects that arise during treatment also varies from patient to patient. In this way, cancer treatment is difficult to decide by looking at the type of cancer alone. From the perspective of medical staff, the calculations for treatment inevitably become more complex each time they encounter a patient. This is because they must establish the most appropriate treatment strategy by comprehensively considering not only the characteristics of the cancer itself but also the patient's overall condition, comorbidities, psychological circumstances, and various environmental factors.
However, the more advanced treatment technology becomes, the more it becomes virtually impossible for a single member of the medical staff to deeply understand all of these areas. The more one devotes oneself to one field, the more distant one becomes from other fields. Perhaps it is the fate of modern medicine that the more new knowledge one gains, the wider the areas one has yet to know also grow. To overcome these limitations, we need a "path of knowledge" that organically connects the knowledge of various fields surrounding cancer and fills in the gaps between them. This is not simply about accumulating more information, but a process of connecting different areas of expertise to find the most suitable treatment for the patient. Above all, the ultimate goal of cancer treatment does not stop at eliminating the cancer itself. The key is to help cancer patients return to their daily lives after completing treatment. The need to also examine quality of life, including physical activity, after cancer treatment is growing ever greater.
The path of knowledge about cancer has made dazzling progress over the past several decades. Now, efforts are needed to fill in the gaps in knowledge among medical staff of various fields, patients, treatments, and treatment environments. I look forward to the future of cancer treatment that a new path of knowledge will bring.
