Disabled World: Revised/Updated: 2019/05/01
Synopsis: Information on the many types of cancer that can affect humans. Includes news and information regarding new cancer treatments and clinical trials. Metastasis is the spread of disease from one organ or part to another non-adjacent organ or part. Cancer may affect people at all ages, even fetuses, but the risk for most varieties increases with age.
Cancer, also known as a malignant tumor or malignant neoplasm, is a group of diseases involving abnormal cell growth with the potential to invade or spread to other parts of the body. Not all tumors are cancerous; benign tumors do not spread to other parts of the body. Possible signs and symptoms include: a new lump, abnormal bleeding, a prolonged cough, unexplained weight loss, and a change in bowel movements, among others. While these symptoms may indicate cancer, they may also occur due to other issues. There are actually over 100 different known types of cancers that affect humans.
Cancer has a reputation for being a deadly disease. While this certainly applies to certain particular types, the truths behind the historical connotations of cancer are increasingly being overturned by advances in medical care. Some types of cancer have a prognosis that is substantially better than nonmalignant diseases such as heart failure and stroke.
The spread of a disease from one organ or part to another non-adjacent organ or part. They then begin to divide and grow again eventually forming a new tumor, called secondary tumors or metastases. Only malignant tumor cells and infections have the capacity to metastasize.
A medical term used to describe a severe and progressively worsening disease, mostly used as a description of cancer.
A tumor that lacks the malignant properties of a cancer. A benign tumor does not grow in an unlimited, aggressive manner, does not invade surrounding tissues, and does not metastasize. Examples of benign tumors include moles and uterine fibroids.
Nearly all cancers are caused by abnormalities in the genetic material of the transformed cells. These abnormalities may be due to the effects of carcinogens, such as tobacco smoke, radiation, chemicals, or infectious agents. Other cancer-promoting genetic abnormalities may be randomly acquired through errors in DNA replication, or are inherited, and thus present in all cells from birth.
Most cancers can be treated and some cured, depending on the specific type, location, and stage. Once diagnosed, cancer is usually treated with a combination of surgery, chemotherapy and radiotherapy. The choice of therapy depends upon the location and grade of the tumor and the stage of the disease, as well as the general state of the patient.
The use of ionizing radiation to kill cancer cells and shrink tumors. Radiation therapy can be administered externally via external beam radiotherapy (EBRT) or internally via brachytherapy.
In theory, non-hematological cancers can be cured if entirely removed by surgery, but this is not always possible. When the cancer has metastasized to other sites in the body prior to surgery, complete surgical excision is usually impossible.
The treatment of cancer with drugs ("anticancer drugs") that can destroy cancer cells. In current usage, the term "chemotherapy" usually refers to cytotoxic drugs which affect rapidly dividing cells in general, in contrast with targeted therapy.
Chemotherapy drugs interfere with cell division in various possible ways, e.g. with the duplication of DNA or the separation of newly formed chromosomes.
Poster dated Sep 2, 1938, promoting early diagnosis and treatment for cancer, showing a rooster crowing at sunrise.
Cancer symptoms can be generally divided into three groups:
Symptoms of metastasis (spreading):
Although advanced cancer may cause pain, it is often not the first symptom.
This list of common cancer types includes cancers that are diagnosed with the greatest frequency in the United States, excluding non-melanoma skin cancers:
Percentage of patients with cancer types deceased five years after cancer diagnosis:
Cancer Causing Agents: List of Currently Known Human Carcinogens - Disabled World - (2014-10-11)