99Tcm-MNLS 与99Tcm-HL91乏氧显像评估肿瘤放疗后乏氧状态的对比实验研究

摘要

Objective To compare the imaging of 99 Tcm‐MNLS and 99 Tcm‐HL91 for the hypoxic assessment in the tumor af‐ter radiotherapy .Methods Twenty four Kunming mice models bearing H22 liver cancer xenografts which tumor were treated ra‐diotherapy for 25 Gy were divided into 99 Tcm‐MNLS instant group ,99 Tcm‐MNLS 48 h group ,99 Tcm‐HL91 instant group ,99 Tcm‐HL91 48 h group and injected the matching 99 Tcm‐MNLS or 99 Tcm‐HL91 to image .The technique of ROI was adopted to calculated the T/NT on the image .Immunohistochemical stain methods were used to evaluate the level of HIF‐1αabout tumors after imaging . Two sample t test was performed .Results The T/NT and the HIF‐1α level about instant (3 .36 ± 0 .20 ,88 .55% ± 0 .83% )were higher than and 48 h (2 .25 ± 0 .43 ,22 .75% ± 3 .35% )in 99 Tcm‐MNLS group(P<0 .05) ,then in 99 Tcm‐HL91 group the T/NT and the HIF‐1αlevel about instant (3 .23 ± 0 .90 ,90 .55% ± 2 .61% )were higher than 48 h (2 .79 ± 0 .85 ,25 .88% ± 3 .76% )(P<0 .05) .The difference of T/NT ,HIF‐1αlevel about instant in 99 Tcm‐MNLS group and 99 Tcm‐HL91 group were no significant(P>0 .05)and the same to the T/NT ,HIF‐1αlevel about 48h in 99 Tcm‐MNLS group and 99 Tcm‐HL91 group(P>0 .05) .Conclusion 99 Tcm‐MNLS hypoxia imaging could provide the change of hypoxia comparable to 99 Tcm‐HL91 ,and the two radiopharmaceutical could both show high accuracy rate in evaluating the hypoxia in the tumor .%目的：99 Tcm‐MNLS、99 Tcm‐HL91放射性核素乏氧显像监测肿瘤放疗后乏氧状态变化的对比研究。方法建立24只荷瘤小鼠模型，待肿瘤直径约1 cm时，按随机数字表法等分为99 Tcm‐HL91即刻显像组、99 Tcm‐HL9148 h显像组、99 Tcm‐M NLS即刻显像组、99 Tcm‐M NLS 48 h显像组。荷瘤小鼠肿瘤部位均给予单次25 Gy的放射治疗，分别于放疗后即刻、48 h注射相应乏氧显像剂99 Tcm‐MNLS或99 Tcm‐HL91，2 h后显像，应用感兴趣区技术（ROI）计算肿瘤／非肿瘤组织放射性比值（T／NT），肿瘤标本行乏氧诱导因子‐1α（HIF‐1α）免疫组织化学染色。对所得 T／NT 比值及 HIF‐1α免疫组织化学结果进行分析。结果99 Tcm‐MNLS即刻显像组 T／NT 比值、HIF‐1α表达量（3．36±0．20、88．55％±0．83％）均较其48 h显像组（2．25±0．43、22．75％±3．35％）增高，差异均有统计学意义（P＜0．05）。99 Tcm‐HL91组即刻显像组 T／NT 比值、HIF‐1α表达量（3．23±0．90、90．55％±2．61％）均较其48 h显像组（2．79±0．85、25．88％±3．76％）增高，差异均有统计学意义（P＜0．05）。99 Tcm‐MNLS和99 Tcm‐HL91组即刻显像组T／NT、HIF‐1α表达量差异均无统计学意义（P＞0．05），48 h显像组T／NT差异均无统计学意义（P＞0．05）。99 Tcm‐MNLS显像在腹部除肾脏外无明显浓集，而99 Tcm‐HL91全腹均有浓集。结论99 Tcm‐MNLS与99 Tcm‐HL91乏氧显像监测肿瘤放疗后乏氧状态的变化效能相近，均能准确地反映肿瘤内的乏氧状态。