Cancer definition in medical literature
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Cancer Definition in Medical Literature
Cancer as Uncontrolled Cell Growth and Malignancy
Cancer is widely defined in medical literature as a group of diseases marked by the uncontrolled growth and division of abnormal cells that can invade nearby tissues and spread to other parts of the body through the blood or lymphatic systems. This process is known as metastasis and is a key feature that distinguishes cancer from benign tumors, which do not invade or spread to distant sites 1234+6 MORE.
Tumor Formation and Types
Most cancers form masses called tumors (neoplasms), although not all tumors are cancerous. Tumors can be benign (non-cancerous) or malignant (cancerous). Malignant tumors are characterized by their ability to invade surrounding tissues and metastasize. Leukemia, a cancer of the blood, is an exception as it typically does not form solid tumors 1345+4 MORE.
Classification of Cancer
Cancers are classified based on the tissue or organ of origin. The main types include:
- Carcinomas: Begin in epithelial cells (skin or lining of organs).
- Sarcomas: Originate in bone, muscle, or connective tissue.
- Leukemias: Affect blood-forming tissues, leading to abnormal white blood cell production.
- Lymphomas: Start in the lymphatic system.
- Myelomas: Involve plasma cells in the bone marrow 12.
Cellular and Molecular Characteristics
Cancer cells are defined by their loss of normal growth control, ability to evade cell death, and potential for invasion and metastasis. These cells often have genetic mutations, chromosomal abnormalities, and changes in gene expression that drive their abnormal behavior. Environmental factors, such as exposure to carcinogens, and genetic predispositions also play a role in cancer development 26810.
Impact and Prevalence
Cancer is a leading cause of death worldwide, second only to cardiovascular diseases. It can affect almost any part of the body and disrupt normal organ function, leading to a wide range of symptoms and complications 2456+2 MORE.
Conclusion
In summary, cancer is defined in medical literature as a group of diseases characterized by the uncontrolled growth and spread of abnormal cells, with the potential to invade tissues and metastasize to distant organs. This definition encompasses a wide variety of cancer types, each with unique origins and behaviors, but all sharing the fundamental properties of malignancy and loss of normal cellular regulation 1234+6 MORE.
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