Now that we know what cancer is and how cancer cells behave, the next question on your mind may be about diagnoses. A patient who is suspected of having a cancerous tumor may have an array of questions to ask, such as: “What type of cancer do I have?” “Is my cancer dangerous?” “What is the exact diagnosis?” “Where is my cancer located?” “Has my cancer spread?” “Is my cancer treatable?” To answer these questions, doctors must first precisely diagnose cancer. Only then can they choose the correct treatment with optimal results at a reasonable cost while avoiding as many side effects as possible. As we can see, doctors must take time to understand the disease as much as possible.