What Is Cancer? - NCI
Explanations about what cancer is, how cancer cells differ from normal cells, and genetic changes that cause cancer to grow and spread.

Cancer - Wikipedia
The cancers causing the most deaths, as of 2020 are lung cancer (1.8 million), colorectal cancer (916,000), liver cancer (830,000), stomach cancer (769,000) and breast cancer (685,000). [2]

Cancer - World Health Organization (WHO)
WHO fact sheet on cancer providing information on the health burden of different types of cancer, causes, risk factors, prevention, early diagnosis, treatment, palliative care, and WHO's work in this area.

All About Cancer - American Cancer Society
Learn about cancer at the American Cancer Society. Find information for specific cancer types: breast, colon, lung, prostate, skin, and more.

What Is Cancer? Symptoms, Causes & Types - Cleveland Clinic
Having cancer is a life-changing event. Knowing what to expect — from diagnosis to recovery — can empower you and help you take control of your health. This is a general overview of what cancer is, what causes it, how healthcare providers treat it and how you can take care of yourself throughout your journey.

Cancer - Symptoms and causes - Mayo Clinic
Find out the basics about cancer, including symptoms, causes and treatments. Learn steps you can take to prevent cancer.

Cancer | Definition, Causes, Types, & Treatment | Britannica
Cancer is a disease characterized by the uncontrolled multiplication of abnormal cells in the body. There are numerous types of cancers, with certain types being major causes of sickness and death worldwide.

15 Early Symptoms That Could Be a Sign of Cancer - Health
Early signs of cancer can include swelling in the neck and skin sores that will not heal. Other symptoms include unusual pain and ongoing itching.

Cancer: Overview, causes, treatments, and types - Medical News Today
In this article, we examine types of cancer, how the disease develops, and how doctors may treat it. We also explore different types of cancer and disease outlook.

Cancer - Wiley Online Library
Cancer, an international interdisciplinary journal of the American Cancer Society, publishes high-impact, peer-reviewed original articles and solicited content on the latest clinical research findings.