Cancer is the sickness reasoned by an unrestrained division of atypical cells in a part of the body; these can consequence in tumours; damage to immune system; and other harm that can be lethal. Some forms of cancer result in noticeable growths named tumor; while others such as leukaemia; do not. The majorities of the body’s cells have specific roles and fixed life spans. Cell death is part of innate and advantageous phenomenon named apoptosis. A cell gets orders to die so that the body can substitute it with a newer cell that functions better. Cancerous cells are deficient in the constituents that order them to discontinue dividing and to die. Accordingly; they increase in the body using oxygen and nutrients that would regularly feed other cells. Cancerous cells can form tumours; damage the immune system and reason other alterations that stop the body from working on a regular basis.
Cancerous cells may emerge in one part; and then extend through the lymph nodes. Many microbial infections may lead to malignancies if left untreated such as Schistosoma haematobium which may lead to bladder carcinoma; Helicobacter pylori which may cause stomach cancer; Salmonella typhi may lead to gall bladder cancer; Chlamydophila pneumoniae which may lead to lung cancer; Escherichia coli and colon cancer; Streptococcus bovis and colorectal cancer and many viral infections may lead to cancer. I think that cancers occur due to microbial cause either due to infection with pathogenic microbe or due to eradication in number or by changing their normal habitat of normal microbial flora which play an important immunological and physiological role in the human body. Extensive studies about the relationship between microorganism and cancer must be conducted; certainly, the relation about the commensal bacteria and cancer.
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