<正> Sister chromatid exchanged （SCE） and chromosome aberrations in peripheral lymphocytesof 30 patients with cervical cancer and relative lengths of C-band in 20 patients were studied. Verysignificant increase in SCE

hypodiploidies and relative lengths of C-band of chromosome 9 were ob-served

and significant increases in polyploidies

structural aberrations and relative lengths of C-bandof chromosome 1 were also found in cancer patients as compared with the controls

with all in non-randomized distribution. No differende was noted in alterations between stage Ⅱ and Ⅲ cancers.These findings suggest that chromosomal instability in the cervical cancer patients may represent aningerent trait in the patient and be related to the increased susceptibility of the individual to malignan-cy.