Cancer cells develop when normal cells behave abnormally. Cell behavior abnormality divides uncontrollably and fuses into a lump or tumor. Cancerous cells can eventually spread to other tissues by invading the healthy cells.
Cancer begins at the cellular level. Approximately 100 million cells make up an average human body. Cancer begins in a single cell. Then develops into a lump of cells called a tumor. When cancer cells develop in this tumor, it is called the primary tumor.
When cancer cells start in the blood, it does not form lumps, instead, it builds up in the blood or bone marrow. This type of cancer is called leukemia, or cancer of the blood, as reported in an article in Cancer Research, UK.
The uncontrollable division happens when a cell or a group of cells are damaged. These damaged cells will no longer understand the signal that is sent to them. They will mutate out of control. The cell then checks the stability of the DNA. If a cell's DNA strands are damaged, it will die. At some instances, the cell ignores the warning of damaged DNA and continues to divide, as mentioned in an article in Science Museum.
The damaged cell that divided lacks the units of chromosomes. The faulty split of DNA construction will no longer understand the instructions given to them and continue to multiply out of control, Mutations could happen and will be influenced by the chemical reactions happening inside the body. Or chemicals that aid the cells to mutate like the chemicals found in smoking tobacco.
A primary tumor is a term given to a section where cancer starts. Damaged cells that cannot heal itself and multiply continuously may develop cancer masses called a tumor. These cells have their own survival defenses most of the time, stronger than the human body's defenses that make the independent to the human cells surrounding it.
Normal cells are bound together if they become detached to other cells, they commit suicide called "apoptosis". This the cancer cells' chance as they do not understand the suicide instructions that the hormones relay. They continue to multiple and is not dependent other cells. They begin to travel in the bloodstream and create more lumps somewhere in the body.
