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Low intestinal bleeding is present in virtually all cases of colorectal cancer. It is such an important feature that the exam detecting it – the faecal-occult-blood test - it is the first screening step in many works. Constipation, diarrhea and intestinal cramps can occur - these are not very specific symptoms and that is why colorectal cancer continues to kill 52% of its patients. An unexplained recent weight loss courses with a poor prognostic in most of times.