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Pernicious anaemia is a type of anaemia in which the it develops due to loss of
of gastric parietal cells, which are responsible, in part, for the secretion of intrinsic factor, a protein essential for subsequent absorption of vitamin B12 in the ileum.

When a man has no measurable level of sperm in his semen he has azoospermia.
Men who are diagnosed with azoospermia before thirty years of age are eight times more likely to develop cancer.So in short azoospermia causes sperm cancer.
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