Cancer is a class of diseases or disorders characterized by uncontrolled division of cells and the ability of these cells to invade other tissues, either by direct growth into adjacent tissue through invasion or by implantation into distant sites by metastasis. Metastasis is defined as the stage in which cancer cells are transported through the bloodstream or lymphatic system. Cancer may affect people at all ages, but risk tends to increase with age. It is one of the leading causes of death in developed countries.
There are many types of cancer. Severity of symptoms depends on the site and character of the malignancy and whether there is metastasis. A definitive diagnosis usually requires the histologic examination of tissue by a pathologist. This tissue is obtained by biopsy or surgery. 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. As research develops, treatments are becoming more specific for the type of cancer pathology. Drugs that target specific cancers already exist for several cancers. If untreated, cancers may eventually cause illness and death, though this is not always the case.
The unregulated growth that characterizes cancer is caused by damage to DNA, resulting in mutations to genes that encode for proteins controlling cell division. Many mutation events may be required to transform a normal cell into a malignant cell. These mutations can be caused by chemicals or physical agents called carcinogens, by close exposure to radioactive materials, or by certain viruses that can insert their DNA into the human genome. Mutations occur spontaneously, or are passed down generations as a result of germ line mutations.
More on [ Cancer ]

American Brain Tumor Association Kids - Learn about brain tumors, share thoughts, get coping tips from other kids, or play games.
Audrey the Brave - Features an interactive story about a little girl named Audrey, who is fighting cancer.
Meta Description: [ AUDREY THE BRAVE, A story about a brave little girl fighting cancer, written by her friend Marlene Jones, pediatric oncology, cancer, bravery ]
Blood Counts for Kids - Provides information how to understand the importance of blood counts in cancer and treatment.
Cancer and Its Treatment - What it is, how it grows, what causes it, and how it is treated. Includes a quiz and interactive illustrations.
Meta Description: [ A key stage 4 reource about cancer for school students studying Biology ]
CancerNet - Credible, current, and comprehensive information from the National Cancer Institute.
Meta Description: [ NCI's expert-reviewed information for health professionals, patients, and the public on topics including cancer treatment, prevention, screening, genetics, survivorship, and resources for coping with cancer. ]
CancerSource - Learn about different forms of this disease, play games, and make a journal. Also, read stories or find a special camp.
Child and Youth Health: Cancer - What Is It? - Explains what it is, the causes, types of treatments and what they do.
Children with Cancer - An interactive support site for children with cancer and children who have a parent with cancer. Includes discussion board, chatroom, and guestbook for sharing stories.
Meta Description: [ Support and meeting place for kids
of parents with cancer and kids/children with cancer with guestbook,
boards and chat room ]
Children's Brain Tumor Foundation - Provides an array of information and resources to assist in accessing expert care to ensure quality of life for children with brain or spinal cord tumors.
Meta Description: [ The Children's Brain Tumor Foundation is dedicated to improving the lives of children with brain and spinal cord tumors, through research, support, education, and advocacy to familes and survivors. ]
Children's Cancer Web - Children with cancer share their webpages. Includes cancer types, treatments, and support and information.
Cool in the Shade - Information about what can cause skin cancer, how to protect your skin, and a risk assessment.
Don't Be A Schmuck: Testicular Cancer - Understand more about this condition, including signs, symptoms, statistics, and performing a self-examination.
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Friday's Children - Information and fun for kids and teens who have been diagnosed with Leukemia and Lymphoma. Learn about these diseases and their treatments, read and share stories and jokes, play games and puzzles, and color pages.
Group Loop - Provides an online support for teens with cancer and their parents.
Meta Description: [ Group Loop is an innovative and groundbreaking program of The Wellness Community (TWC) to provide online support for teens with cancer and their parents. ]
Kids Cancer Network - Features coloring pages and games for kids dealing with cancer. Download monthly Funletter. [Requires Adobe Reader]
Kids Konnected - Provides friendship, understanding, education, and support for the children who have a parent with cancer, or have lost a parent to cancer.
KidsHealth: Hodgkin's Disease - Read about what causes this kind of cancer, the symptoms, what the doctor does, and living with this disease.
Meta Description: [ Hodgkin's disease is a type of lymphoma, and it is the fourth most common cancer in kids ages 10 to 14. Read our article just for kids to find out more. ]
Mattdotcom - UK organization dedicated to providing ill teens access to computer technology by funding for laptops and computers.
NCI: Childhood Cancers - Information, resources, and links about childhood cancers and treatments from the National Cancer Institute.
Meta Description: [ NCI's gateway for information about pediatric cancers. ]
NOVA Online: Cancer Warrior - Tells the story of Dr. Judah Folkman, a researcher who has spent the past 30 years trying to find a way to curb cancer. Includes interview clips, interactive feature that traces the growth of a malignant tumor, and an hour-long PBS feature in QuickTime and RealVideo formats.
Meta Description: [ NOVA Online/Cancer Warrior. ]
Planet Cancer - A gathering place for young adults, includes cancer comics, advice, cancertainment, news, current research, and forums.
Super Sibs - Supports and recognizes brothers and sisters of children with cancer.
Teen's Guide to Cancer - Presents information about causes and treatment, with personal accounts and a list of the most common forms of this disease in adolescents.
Teenage Cancer Trust: Health Facts - Learn about different types of this disease, link to teen resources and view UK teen cancer statistics.
Meta Description: [ Welcome to the Teenage Cancer Trust Website ]
Teens Living with Cancer - Offers information and resources about cancer, treatments, and support network presented by teens for teens.
Meta Description: [ For teens with cancer who have lots of living to do! Get straight information – we know what it’s like. Connect with others – teens, family and friends. Read about “real” teens with cancer. Get good medical info about teen cancers from national experts. ]
TeensHealth: Cancer Basics - Learn what it is, the causes, symptoms, and types of treatment. Includes information about coping.
Meta Description: [ Get the basics on cancer and cancer treatments in this article. ]
TeensHealth: Types of Cancer Teens Get - Article about some types that teens are more likely to get. Learn about warning signs, symptoms, and how doctors treat these cancers.
Meta Description: [ Cancer is rare in teens, but there are some types that teens are more likely to get. Read this article to learn about these types of cancer, including warning signs and symptoms and how doctors treat these cancers. ]
The Adventures of Captain Chemo - Interactive games based on a comic created by a young cancer patient. Learn about the disease, treatment and side effects, and take a quiz.
The Cancer Game - Stress relief for cancer patients, in which they can visualize and destroy cancer on a computer screen.
Meta Description: [ This game is for stress relief for cancer patients, in which they can visualize and destroy cancer on a computer screen. ]
When Someone in Your Family Has Cancer - Online brochure from the National Cancer Institute provides information on the disease itself, treatment options, and the way in which cancer affects families.
Meta Description: [ Written for young people with a parent or other family member who has cancer. Includes sections on the disease, its treatment, and emotional concerns. ]
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