Abstract PTH-295 Table 1
Symptoms/signsDistal Ca*1 (Nos/%)Proximal Ca*2(Nos/%)Proximal Ca without a mass or IDA
(Nos/%) 		NNI to diagnose a proximal ca without a mass or IDA
all cancers1326 (84%)258 (16%)113 (7%)1:223
+C+B783 (59%)46 (18%)22 (19%)1:331
+C-B-A119 ((9%)27 (11%)12 (11%)1:217
+C-B+A133 (10%)96 (33%)40 (35%)1:92
+B-C-P166 (13%)30 (12%)20(18%)1:145
+B-C+P108 (8%)15 (6%)6 (5%)1:1193
+A-B-C17 (1.3%)44 (17%)13 (12%)1:119

  • ↵*1 Rectal and sigmoid ca;

  • ↵*2 Ca proximal to sigmoid; +C change in bowel habit; +B rectal bleeding; +A abdominal pain, +P perianal symptoms; +C+B, +B-C-P, +B-C+P with and without abdominal pain; NNI Number needed to investigate to diagnose one cancer