Lung cancer symptoms do not usually present themselves until
the cancer is advanced. This is why lung cancer often goes undetected in the
early stages. Lung cancer symptoms include:
- Persistent cough
- Coughing up blood
- Chest pain
- Recurring chest infections
- Voice hoarseness
What Is Lung
Cancer?
Cancer occurs when cells in the body undergo a mutation that
causes them to grow rapidly and uncontrollably. Lung cancer forms when cancer
cells invade and destroy healthy cells in the lung tissues and air passages. It
can take several years to develop. It may begin as pre-cancerous changes in the
lungs that neither cause symptoms nor show up on an X-ray.
Eventually cancer cells accumulate to form a tumor. As the
tumor grows, it impedes the ability of the lungs to function properly.
Cancerous cells can break away from the original tumor, travel through the
bloodstream, and form tumors in other parts of the body. This process is called
metastasis.
Types of Lung
Cancer
There are two main types of lung cancer. They are small cell
and non-small cell. The names refer to how the cells appear to pathologists
under a microscope. Each type and stage of lung cancer warrants unique
treatment options.
Small Cell Lung
Cancer (SCLC)
According to the National Cancer Institute (NCI), small cell
lung cancer accounts for 15 percent of all lung cancers. Small cell lung cancer
starts in neuroendocrine cells. These are the air tubes that lead to the lungs
(the bronchi) and the cells in lung tissue. It grows very quickly. It produces
large tumors that can travel through the blood and spread quickly throughout
the body. Small cell lung cancer mainly affects heavy or lifetime smokers.
There are two main types of small cell lung cancer. They are
small cell carcinoma (oat cell cancer) and combined cell carcinoma. Oat cell
cancer is the most common type of small cell lung cancer. The cells resemble
oats when examined under a microscope.
Non-Small Cell
Lung Cancer (NSCLC)
According to the National Institutes of Health, non-small
cell lung cancer makes up about 85 percent of all lung cancer cases in the
United States. The cancer cells are larger, and the cancer is slower growing
than small cell lung cancer. NSCLC consists of three subtypes:
Squamous cell carcinoma (or epidermoid carcinoma) accounts
for 25 to 30 percent of all lung cancer. It begins in the cells that line the
air passages. If not treated it may spread to the lymph nodes, bones, adrenal
glands, liver, and brain. It’s the most common type of lung cancer in men and
is heavily linked to smoking.
Adenocarcinoma makes up about 40 percent of all lung cancer.
It forms in the mucus-producing (outer) part of the lungs. It develops slowly
and is the most common type of lung cancer in women and nonsmokers.
Large-cell (undifferentiated) carcinoma includes all
non-small cell lung cancer that can’t be classified as squamous or
adenocarcinoma (about 10 to 15 percent). It sometimes forms near the surface,
in the outer edges of the lungs, and grows rapidly.
Long-Term
Outlook
According to the American Lung Association, the lung cancer
five-year survival rate is lower than many other leading cancers. Over half of
people with lung cancer die within a year of their diagnosis.
These statistics often don’t reveal how many of those are
still in treatment at the five-year mark as opposed to those who have reached
remission (no sign of cancer). Your personal prognosis will be based on a great
many factors. These include:
- Type and stage of cancer
- Age at onset
- Overall health
- Lifestyle
The success of
your treatments
Your overall emotional health can also impact your
prognosis. Build a strong support system for yourself and gather as much
information about your condition as you can.
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