Ji. Langridge et al., GAS-CHROMATOGRAPHY MASS-SPECTROMETRIC ANALYSIS OF URINARY NUCLEOSIDESIN CANCER-PATIENTS - POTENTIAL OF MODIFIED NUCLEOSIDES AS TUMOR-MARKERS, Rapid communications in mass spectrometry, 7(6), 1993, pp. 427-434
Analysis of urine from cancer patients by capillary gas chromatography
/mass spectrometry positively identified 14 urinary nucleosides includ
ing several modified nucleosides. Levels of the modified nucleosides 1
-methyladenosine, 2-methylguanosine, N2,N2-dimethylguanosine and 1-met
hylinosine as well as the total nucleoside level were elevated in the
urine when a malignant tumour was present; the levels of N2,N2-dimethy
lguanosine were found to correlate with the stage of the cancer.