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2WW
 >40 with rectal bleeding and change of bowel habit (looser) and/or inc frequency of >6/52
 >60 with rectal bleeding for >6/52 without change in habit or anal Sx
 >60 change in habit (looser) or inc frequency for >6/52
R lower abdo mass
palpable rectal mass
unexplained iron deficiency anaemia in men or no-mense women (Hb<11 M, <10 F)

Note - diarrhoea is more impt than constipation

''Screening''
''Overview''
    most cancers develop from adenomatous polyps.
Screening reduces mortality by 16%
    NHS national screening programme FOB every 2y to all men and women aged 60 to 69 years. (over 70 years may request screening)
    tests through the post
    abnormal results are offered a colonoscopy

''At colonoscopy'', approximately:
    5 out of 10 patients will have a normal exam
    4 out of 10 patients will be found to have polyps which may be removed due to their premalignant potential
    1 out of 10 patients will be found to have cancer