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Bromodeoxyuridine標識率(BUdR LI)はDNA合成期にある細胞の割合を示し,腫瘍の増殖能と密接に関係するとされるものの,実際の成長は他の因子により修飾を受ける。われわれは19例の脳腫瘍に対しBUdR,およびその同族体であるiododeoxyuridine(IUdR)による二重標識を行い免疫組織学的手法によりDNA合成時間(Ts),理論的倍化時間(Tp)を算出し腫瘍増殖の定量化を試みた。BUdR-LIはmalignant gliomaならびに転移性脳腫瘍では1%から26%までと幅広く分布していたが,Tsは前者で平均8.9±1.8時間,後者で平均9.2±2.5時間,また髄膜腫においては平均9.2±0.3時間と各腫瘍間で変動がなかった。一方,Tpは,malignant gliomaで平均4.3±3.5日,転移性脳腫瘍で2.1±1.1日,髄膜腫で20.0±7.6日と著明な差異が認められた。しかも同一腫瘍間でもTpは大きなバラツキが認められた。このようにTpを求めることは潜在的な腫瘍の増殖速度を示唆するものであり,実際の腫瘍倍化時間(Td)とは直接結びつかないが脳腫瘍患者の予後判定,再発期間の差の把握,治療指針の決定などに重要な情報を提供するものと考える。
Nineteen patients with human brain tumors (9 gliomas, 6 metastatic brain tumors, 3 meningiomas, 1 neurinoma) received intravenous infusions of iododeoxyuridine (IUdR) and bromodeoxyuridine (BUdR) at different time sequences, to estimate the duration of S-phase (Ts) and the potential doubling time (Tp) of individual tumors. Excised tumor specimens were reacted with Br-3, a monoclonal antibody that identifies only BUdR, and with IU-4, a monoclonal antibody that recognizes both IUdR and BUdR, and then were stained immunohisto-chemically. The BUdR LIs varied from 0.9% to 26.0%, reflecting the malignancy of each tumor. Despite the difference in LIs, however, the Ts measured was fairly uniform. The Ts was 8.9±1.8 hrs (mean±SD) in malignant gliomas, 9.2±2.5 hrs (mean±SD) in metastatic brain tumors and 9.2±0. 3 hrs (mean±SD) in meningiomas, respectively. In contrast, the Tp varied from 1.3 to 12.4 days in malignant gliomas and from 1.2 to 4.4 days in metastatic brain tumors. Double logarithmic regres-sion analysis showed a close correlation between the BUdR LI and Tp in human brain tumors with LI>1%. Double labeling studies with BUdR and IUdR allow some of the proliferation characteristics to be determined from a single biopsy specimen and provide more useful information of each tumors than can be obtained by single-labeling studies with BUdR.
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