Explanation –

Statements 1, 2 and 3 are correct. Lung cancer is the most common type of cancer and the leading cause of cancer-related deaths worldwide. In India, lung cancer rates are increasing rapidly, contributing to 10% of cancer deaths. India is the fourth highest in the world for lung cancer cases. Smoking tobacco is the main risk factor for lung cancer. In India, lung cancer is usually detected only at advanced stages (Stage 3 or 4), when it’s no longer curable, leading to poor survival rates. Many patients already have cancer spread to other parts of the body by the time it’s diagnosed. This delay is often due to inadequate screening, lack of resources, and a high rate of tuberculosis (TB), which can make it harder for primary care doctors to identify lung cancer.

Source: The Hindu