Lung Cancer: Causes, Stages and Survival Rates

Lung Cancer: Causes, Stages and Survival Rates

80 to 85 per cent of lung cancer cases reports patients suffering from non-small cell lung cancer (NSCLC) whereas 15-20 percent of cases suffer from small cell lung cancer (SCLC). This type of cancer grows and spreads faster than NSCLC, which obviously makes it more likely to respond to chemotherapy but it is less likely to be cured with the treatment.

In rare cases, lung cancer may contain both NSCLC as well as SCLC cells. Tumours in the lungs can grow quite large before you start noticing any symptoms. A few early symptoms maybe cold or other common conditions which people generally discard and do not seek medical attention for.


Anyone can get lung cancer, but in 90% of the cases lung cancer happens all thanks to smoking. Your lung tissues start damaging as soon as you inhale smoke into your lungs and continuous exposure to smoke makes it difficult for the lung to repair. Once these cells are damaged, they start behaving abnormally, increasing your chances of developing lung cancer. Breathing in an environment that contains hazardous gases is another reason that can lead to lung cancer.

Inherited genetic mutation may also make an individual more likely to develop lung cancer and in some cases, there are no causes that lead to such a condition.


Non-small cell lung cancer has four main stages:

1) Stage 1: Cancer is found in the lung, but it has not spread outside the lung.
2) Stage 2: Cancer is found in the lung and nearby lymph nodes.
3) Stage 3: Cancer is in the lung and lymph nodes in the middle of the chest.
a) Stage 3A: Cancer is found in lymph nodes, but only on the same side of the chest where cancer first started growing.
b) Stage 3B: Cancer has spread to lymph nodes on the opposite side of the chest or to lymph nodes above the collarbone.
4) Stage 4: Cancer has spread to both lungs, into the area around the lungs, or to distant organs.

Life Expectancy:
In recent years, there have been new treatments that have developed to treat patients suffering from stage 4 cancer.
The survival rates of NSCLC are as follows:

Stage 1: 45 to 49 percent
Stage 2: 30 to 31 percent
Stage 3A: 14 percent
Stage 3B: 5 percent
Stage 4: 1 percent

If you are suffering from lung cancer or know someone who is then feel free to consult our highly specialized doctors at PSRI Hospital( ) .

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