Lung cancer is the deadliest type of cancer in both, men and women. Each year, more people die of it than breast, colon and prostate cancers combined. Though cigarette smoking has been the leading cause of lung cancer, there have been occurrences amongst non-smokers as well. While lung cancer is asymptomatic in the early stages, it can be detected via X-ray.
Some of the common symptoms of lung cancers are:
· Chronic cough for more than a month
· Coughing up blood (Haemoptysis)
· Shortness of breath
· Chest pain
· Difficulty in swallowing
· Progressive weight loss
· Loss of appetite
· Joint problems
· Swelling of the arms and face
SMOKING AND LUNG CANCER:
Cigarette smoke contains over 60 known carcinogens, including radioisotopes from the radon decay sequence, nitrosamine, and benzopyrene. Additionally, nicotine appears to depress the immune response to cancerous growths in exposed tissue. It is not surprising then that smoking accounts for 80–90% of lung cancer cases.
Passive smoking – it is the inhalation of smoke resulting from another person smoking nearby. It is a known cause of lung cancer in non-smokers. A passive smoker can be classified as someone living or working with a smoker.
Those who live with smokers have a 20-30% higher risk while those in second hand smoke environment have 16-19% higher risk compared to non-smokers who are away from such environments.
RADON GAS AND LUNG CANCER:
Radon is a colourless and odourless gas generated by the breakdown of radioactive radium. The radiation decay products ionise genetic material, causing mutations that sometimes turn cancerous.
For every increase of radon concentration by 100 Becquerel per atomic mass, the risk increases 8-16%. Becquerel is a derived unit for measuring radioactivity.
ASBESTOS AND LUNG CANCER:
Asbestos can cause a variety of lung diseases, including lung cancer. Tobacco smoking and asbestos have a synergistic effect on the formation of lung cancer.
AIR POLLUTION AND LUNG CANCER:
Outdoor air pollution has a small effect on increasing the risk of lung cancer. Fine particulates (PM2.5) and Sulphate aerosols, which are released in traffic exhaust fumes, increase the risk of lung cancer.
An increment of 10 parts per billion of Nitrogen Dioxide increases the risk of lung cancer by 14%. Outdoor air pollution is estimated to account for 1–2% of lung cancers.
There is evidence to prove that an increased risk of lung cancer is attributed to air pollution such as burning of wood, charcoal, dung or crop residue for cooking and heating. Women who are exposed to indoor coal smoke have about twice the risk. Also, a number of by-products of burning biomass are known for suspected carcinogens.
GENETICS AND LUNG CANCER:
It is estimated that 8-14% of lung cancer is due to inherited factors. In relatives of people with lung cancer, the risk is increased 2.4 times. This is likely due to a combination of genes.
Numerous other substances, occupations and environmental exposures have been linked to lung cancer which are:
Production and mining of some metals and arsenic compounds
By-products of combustion such as Carbon Monoxide, Sulphur Dioxide, Nitrogen Oxides & Lead.
Rubber production and crystalline silica dust
When it comes to treating lung cancer, one has to understand the cancer's specific cell type, how far it has spread and the person's overall health. In cases where the cancer has spread to other organs, it is termed as metastatic lung cancer.
Common lung cancer treatments include palliative care, surgery, chemotherapy, and radiation therapy. The treatment is entirely dependent on the stage of lung cancer.