Cancer

Definition

Cancer involves the uncontrolled growth of abnormal cells that have mutated from normal tissues. This growth can kill when these cells prevent normal function of vital organs or spread throughout the body, damaging essential systems.

Causes, incidence, and risk factors

There are many different kinds of cancers. Cancer arises out of normal cells in the body, and can develop in almost any organ or tissue, such as the lung, colon, breast, skin, bones, or nerve tissue.

In general, cancer appears to be caused by abnormal regulation of cell division. Cancers can occur when cells divide too rapidly or when cells “forget” how to die.

There are multiple causes of cancers such as:

• Radiation
• Sunlight
• Tobacco
• Certain viruses
• Benzene
• Certain poisonous mushrooms and aflatoxins (a poison produced by organisms that can grow on peanut plants)

However, the cause of many cancers remains unknown.

The three most common cancers in men in the U.S. are prostate cancer, lung cancer, and colon cancer. In women here, the three most frequently occurring cancers are breast cancer, lung cancer, and colon cancer.

The most common cause of cancer-related death is lung cancer.

Certain cancers are more common in particular geographic regions. For example, in Japan, there are many cases of gastric cancer, while in the US this type of cancer is relatively rare. Dietary differences may account for the variance.

Symptoms

Symptoms of cancer depend on the type and location of the tumor. For example, lung cancer can cause coughing, shortness of breath, or chest pain, while colon cancer often causes diarrhea, constipation, and blood in the stool.

Some cancers may not have any symptoms at all. However, the following symptoms are common with most cancers:

• Fever
• Chills
• Night sweats
• Weight loss
• Loss of appetite
• Fatigue
• Malaise

Signs and tests

Like symptoms, the signs of cancer vary based on the type and location of the tumor. Common tests include the following:

• CT scan
• Complete blood count (CBC)
• Blood chemistries
• Biopsy of the tumor
• Bone marrow biopsy (for lymphoma or leukemia)
• Chest x-ray

Most cancers are diagnosed by biopsy. Depending on the location of the tumor, the biopsy may be a simple procedure or a serious operation. Most patients with cancer undergo CT scans to determine the exact location of the tumor or tumors.

Treatment

Treatment also varies based on the type of cancer and its stage. The stage of a cancer refers to how much it has grown and whether the tumor has spread from its original location.

• If the cancer is confined to one location and has not spread, the goal for treatment would be surgery and cure. This is often the case with skin cancers.
• If the tumor has spread to local lymph nodes only, sometimes these can also be removed.
• If all of the cancer cannot be removed with surgery, the options for treatment include radiation, chemotherapy, or both. Some cancers require a combination of surgery, radiation, and chemotherapy.

Support Groups

The diagnosis of cancer often causes a lot of anxiety and can affect a person's entire life. There are numerous support groups for cancer patients.

Expectations (prognosis)

The outlook varies widely among different types of cancer. Even among people with one particular type of cancer, the outcome varies depending on the stage of the tumor at diagnosis. Some cancers can be cured, some that are not curable can still be treated well, and some patients can live for many years with the cancer. Other tumors are rapidly fatal.

Complications

One complication is that the cancer may spread. Other complications vary with the type and stage of the tumor.

Calling your health care provider

You should contact your doctor if you develop signs or symptoms suggestive of cancer.

Prevention

One of the best ways to prevent cancer is to not smoke or chew tobacco. Many cancers can be prevented by avoiding risk factors such as excessive exposure to sunlight and heavy drinking.

Cancer screenings, such as mammography and breast examination for breast cancer and colonoscopy for colon cancer, may help catch these cancers at their early, most treatable stages. Some people at high risk for developing certain cancers can take medication to reduce their risk.

Page Content:

Carcinoma; Malignant tumor ; squamous cell carcinoma; basal cell carcinoma; carcinoma; renal cell carcinoma; small cell carcinoma; invasive ductal carcinoma; basal cell carcinoma picture; hepatocellular carcinoma; carcinoma in situ; ductal carcinoma in situ; ductal carcinoma; adenoid cystic carcinoma; transitional cell carcinoma; squamous carcinoma; basil cell carcinoma; infiltrating ductal carcinoma; bronchogenic carcinoma; lobular carcinoma; nasopharyngeal carcinoma; papillary carcinoma; merkel cell carcinoma; neuroendocrine carcinoma; non small cell carcinoma; spindle cell carcinoma; carcinoma cancer; endometrial carcinoma; signet ring cell carcinoma; squamous cell carcinoma lung; squamous cell carcinoma picture; renal carcinoma; large cell carcinoma; invasive lobular carcinoma; papillary thyroid carcinoma; adeno carcinoma; lobular carcinoma in situ; lung carcinoma; breast carcinoma; oat cell carcinoma; mucoepidermoid carcinoma; treatment for squamous cell carcinoma; clear cell carcinoma; mucinous carcinoma; metastatic carcinoma; bronchoalveolar carcinoma; small cell carcinoma of the lung; basel cell carcinoma; basal cell carcinoma treatment; anal carcinoma; epidermoid carcinoma; thyroid carcinoma; intraductal carcinoma; medullary carcinoma; adrenocortical carcinoma; invasive squamous cell carcinoma; squamous cell carcinoma of the tongue; gastric carcinoma; basal carcinoma; primary peritoneal carcinoma; superficial basal cell carcinoma; oral squamous cell carcinoma; cervical carcinoma; basal cell carcinoma skin cancer; acinic cell carcinoma; prostate carcinoma; medullary thyroid carcinoma; infiltrating lobular carcinoma; carcinoma basocelular; metastatic renal cell carcinoma; invasive carcinoma; cell carcinoma; embryonal carcinoma; ovarian carcinoma; colon carcinoma; prognosis invasive ductal carcinoma; inflammatory carcinoma; verrucous carcinoma; squamous cell carcinoma in situ; adrenal carcinoma; bladder carcinoma; sebaceous carcinoma; metaplastic carcinoma; cancer carcinoma cell lung small; squamous cell carcinoma lung cancer; peritoneal carcinoma; adenoid carcinoma; hurthle cell carcinoma; cervical carcinoma in situ; urothelial carcinoma; basal cell carcinoma nose; squamos cell carcinoma; adrenal cortical carcinoma; squamous cell carcinoma cancer; pancreatic carcinoma; colorectal carcinoma; metastatic squamous cell carcinoma; bronchioloalveolar carcinoma; papillary serous carcinoma; carcinoma of the tongue; thymic carcinoma; squamous cell carcinoma of the cervix; malignant tumor; malignant brain tumor; malignant mixed mullerian tumor; malignant peripheral nerve sheath tumor; benign and malignant tumor; malignant bone tumor; malignant breast tumor; non malignant brain tumor; malignant mixed mullerian tumor ovary; malignant mixed mullerian ovarian tumor; difference between benign and malignant tumor; malignant mixed mesodermal tumor; non malignant tumor; parotid malignant tumor