Que causa o cancro?

O cancro é definido como um grupo de doenças que têm uma vasta gama de causas. Cada cancro difere na biologia e na patofisiologia, mas todos os animais e mesmo plantas são suscetíveis ao cancro.

Tumor

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Last Updated: Jan 30, 2019

Dr. Ananya Mandal

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Dr. Ananya Mandal

Dr. Ananya Mandal is a doctor by profession, lecturer by vocation and a medical writer by passion. She specialized in Clinical Pharmacology after her bachelor's (MBBS). For her, health communication is not just writing complicated reviews for professionals but making medical knowledge understandable and available to the general public as well.

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Comments

  1. Vadim Shapoval Vadim Shapoval Ukraine says:

    1) American Cancer Society: cancer is a complex group of diseases with many possible causes. 2) Cancer Research UK: there is no single cause for any one type of cancer. 3) Wikipedia: it is nearly impossible to prove what caused a cancer in any individual, because most cancers have multiple possible causes. 4) News-Medical.Net: cancers are a broad group of diseases and accordingly have a wide range of causes; each cancer is different according to its biology and pathophysiology; all animals and even plants are susceptible to cancers. 5) World Health Organization and its cancer research agency (IARC): cancer arises from one single cell; the transformation from a normal cell into a tumour cell is a multistage process, typically a progression from a pre-cancerous lesion to malignant tumours; these changes are the result of the interaction between a person's genetic factors and three categories of external agents, including physical carcinogens, chemical carcinogens and biological carcinogens. 6) Patient.co.uk: cancer is a disease of the cells in the body; each cancer is thought to first start from one abnormal cell; what seems to happen is that certain vital genes which control how cells divide and multiply are damaged or altered; many cancers seem to develop for no apparent reason. 7) German Cancer Research Center (Deutsches Krebsforschungszentrum, DKFZ): practically every organ can be affected, every type of cancer has its own rules, and the underlying changes in affected cells are extremely complex. Knowledge about the structure and functioning of DNA is necessary in order to decipher the causes of cancer. 8) National Cancer Institute: the genetic material (DNA) of a cell can become damaged or changed, producing mutations that affect normal cell growth and division; cancer is often perceived as a disease that strikes for no apparent reason; while scientists don't yet know all the reasons, many of the causes of cancer have already been identified; one way of identifying the various causes of cancer is by studying populations and behaviors. 9) NetDoctor.co.uk: cancer is the development of abnormal cells that the body cannot control; cancer affects nearly one in every three people in the population. 10) PubMed Health: there are many causes of cancer; however, the cause of many cancers remains unknown. OLD TESTAMENT (the first division of the Christian Bible): 1) magnetism (one of the phenomena by which objects exert attractive and repulsive forces on other objects) causes cancer; 2) depending on the configurations of electrons in their atoms, different substances exhibit differing types of magnetic behavior (diamagnetism, paramagnetism, ferromagnetism, ferrimagnetism, and antiferromagnetism); 3) intracellular molecules FeO;Fe2O3;Fe3O4 are the main 'creators' of intracellular superparamagnetic, ferrimagnetic and ferromagnetic nanoparticles; 4) cancer works (kills religious and non-religious cancer patients) by these nanoparticles; 5) ancient anti-iron methods of The Old Testament can quickly beat any cancer (a subtle iron disease; intracellular superpara-ferri-ferromagnetic 'infection'; the first-born of death) and religious beliefs of cancer patients-non-Christians.

  2. Maia Romero Maia Romero Argentina says:

    Todos los cánceres empiezan en las células. Las células son las unidades básicas que forman los tejidos del cuerpo. Para entender mejor qué es el cáncer, es necesario saber cómo las células normales se vuelven cancerosas.

    El cuerpo está compuesto de muchos tipos de células. Estas células crecen y se dividen para producir nuevas células conforme el cuerpo las necesita.Cuando las células envejecen, mueren y éstas son reemplazadas por células nuevas.

    Pero a veces, este proceso ordenado de división de células se descontrola. Células nuevas se siguen formando cuando el cuerpo no las necesita. Cuando esto pasa, las células viejas no mueren cuando deberían morir. Estas células que no son necesarias pueden formar una masa de tejido. Esta masa de tejido es lo que se llama tumor. No todos los tumores son cancerosos. Los tumores pueden ser benignos o malignos.

  3. Nidy Marin Nidy Marin United States says:

    I just getting more confused than before.... Why the Red Meat is one of the cause of cancer?

  4. Stellea Shapcot Stellea Shapcot India says:

    Thank you Dr Ananya for sharing such a valuable information. I must appreciate its a very helpful article and really informative one. Keep up the good work and keep sharing such wonderful information.

The opinions expressed here are the views of the writer and do not necessarily reflect the views and opinions of News-Medical.Net.
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