All lung cancer is pretty aggressive but the most aggressive lung cancer is the SCLC type of lung cancer.
The SCLC type of lung cancer is the fastest spreading and most aggressive lung cancer there is.
Although the cells of the SCLC lung cancer are small those small SCLC lung cancer cells can spread very rapidly and if not diagnosed and treated in a timely manner then it can lead to death within a year or two or sometimes sooner.
The sooner you get diagnosed and treated for any type of lung cancer the higher your chance of survival.
But the longer you wait for diagnoses on the lung cancer and treatment on the lung cancer the more the lung cancer spreads and the sooner it will kill you.
Some types of lung cancer can be in your body for a few years before you even feel any symptoms and get diagnosed.
So it's important to get your checkups and tests done often enough to catch any potentially deadly diseases in time and get treated.