[Relationship between telomere length and clinical and biological characteristics of the cancers with telomerase reactivation].

Activation of telomerase and stabilization of telomeres are considered to be necessary for immortalization of human tumor cells. Telomerase activity and telomere lengths were examined in adult and childhood cancer tissues. High telomerase activity was detected in over 40% samples. In these cases, the lengths of telomeres varied in wide range and the short telomere length significantly correlated with high proliferative index. The patients with short telomeres demonstrated poorer prognosis than other patients. These findings suggest that the short telomeres might be related with the malignant potential in cancers with high telomerase activity.