Table 1.

Selection of compounds occurring only in the group of patients with bladder cancer.

Compound	Origin *	Presence in BC Group	% of Occurrence in BC Group
Pyridine	exogenous, food	22	55
4-Propylbenzaldehyde	-	19	47.5
2,3-Heptanedione	exogenous, food	18	45
Heptanal	endogenous/exogenous, food	18	45
4-Methyl-3-pentenoic acid	-	14	35
1-Heptanol	exogenous, food	13	32.5
1-Octen-3-one	exogenous, food, esp. mushrooms	12	30
2,6-Dimethyaniline	exogenous, lidocaine metabolism	11	27.5
11-Hexadecen-1-ol	-	10	25
4,6-Dimethyl-2-heptanone	-	9	22.5
2-Butyl-1-octanol	-	8	20
2,3,5-Trimethylfuran	exogenous, food	8	20

* The Human Metabolome Database information.