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Table 4 distribution of tumor sites by family history of colorectal cancer according to age of the proband.

From: Family history of colorectal cancer in Iran

Age group

Positive FH† of CRC

Negative FH of CRC

CRC localization

  

Total†

N = 76

N = 373

Righta

28(36.9%)

66(17.7%)

Left

24(31.6%)

167(44.8%)

Rectum

22(29%)

139(37.3%)

NOS

2(2.5%)

1(0.03%)

Over 45

N = 43

N = 294

Rightb

14(32.6%)

49(16.7%)

Left

11(25.6%)

136(46.3%)

Rectum

18(41.8%)

109(37.1%)

Less than 45

N = 33

N = 79

Rightc

14(42.4%)

17(21.5%)

Left

13(39.4%)

31(39.2%)

Rectum

4(12.1%)

30(38%)

NOS

2(6.1%)

1(1.3%)

  1. †: difference of tumor site distribution between two groups (p < 0.001)
  2. a,b,c: p < 0.05
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BMC Cancer

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