Why is cancer difficult to cure?

Cancer is caused by mutated cells. When a person is exposed to radiation or chemicals, some of the cells' DNA mutates, which stops the cells from responding to signals. As a result, the cell undergoes uncontrolled mitosis and forms a tumour. Most of these cells are killed during chemotherapy or other treatments, but some survive and begin to replicate once more. Eventually, new tumours form due to metastasis, and the person becomes ill again.

Cancer is difficult to cure due to its complex nature, which involves various factors such as genetic mutations, tumor heterogeneity, metastasis, and the ability of cancer cells to evade the immune system. Additionally, cancer cells can develop resistance to treatments over time, making it challenging to eradicate them completely. Moreover, different types of cancer require different treatment approaches, further complicating the search for a universal cure.