^(131)I-MIBG对嗜铬细胞瘤术后复发及转移的诊断

１３１ＩＭＩＢＧ对嗜铬细胞瘤术后复发及转移的诊断张锦明田嘉禾徐白萱刘自来徐发良作者单位解放军总医院核医学科，北京１００８５３临床对肾上腺外嗜铬细胞瘤，特别术后复发及转移诊断较困难。应用嗜铬细胞瘤特异性显像剂—１３１Ｉ间碘苄胍（１３１ＩＭＩＢＧ）...

Isotropic volumetric MRI for displaying cranial perineural spread of cranial nerve in nasopharyngeal carcinoma

Objective To observe the value of isotropic volumetric MRI for displaying perineural spread(PNS)of cranial nerve(CN)in nasopharyngeal carcinoma.Methods Eighty-seven patients with pathologically proven nasopharyngeal carcinoma were prospectively enrolled.MR scanning,including three-dimensional liver acquisition with volume acceleration-flexible(3D LAVA_Flex)image,T2WI with fat suppression(T2WI-FS),T1WI,contrast enhancement(CE)T1WI-FS of nasopharynx and neck region were performed.The displaying rates of CN PNS were evaluated and compared between 3D LAVA_Flex and T2WI-FS,T1WI,CE-T1WI-FS at patient level,CN group level and neural level,respectively.Results The displaying rate of CN PNS in all 87 nasopharyngeal carcinoma patients by 3D LAVA_Flex sequence was 49.43%(43/87),higher than that of conventional MRI(30/87,34.48%,P=0.001).Among 59 patients with advanced nasopharyngeal carcinoma diagnosed with conventional sequences,the displaying rate of CN PNS was 71.19%(42/59)by 3D LAVA-Flex sequence,higher than that of conventional MRI(30/59,50.85%,P=0.001).At both patient level and posterior CN level,significant differences of the displaying rate of CN PNS were found between 3D LAVA-Flex sequence and T2WI-FS,T1WI,CE-T1WI-FS,while at CN level,the displaying rates of mandibular nerve PNS,CNⅨ—ⅪPNS in jugular foramen(P<0.05)and CNⅨ—ⅫPNS in carotid space of 3D LAVA_Flex sequence were all significantly higher than that of T2WI-FS,T1WI and CE-T1WI-FS(all P<0.05),of PNS of CNⅢ—Ⅴin cavernous sinus were higher than that of T2WI-FS(P<0.05),while of PNS of hypoglossal nerve were significantly higher than that of T2WI-FS and T1WI(both P<0.05).Conclusion 3D LAVA_Flex sequence could be used to effectively display CN PNS of nasopharyngeal carcinoma.

As_2O_3对人卵巢癌顺铂耐药细胞株裸鼠腹腔移植瘤作用及其机制的探讨

目的:探讨三氧化二砷(As2O3)对人卵巢癌顺铂耐药细胞株3AO/DDP细胞裸鼠腹腔移植瘤的影响及其作用机制。方法:4×106个3AO/DDP细胞接种于裸鼠腹腔96 h后,随机分为5组,分别腹腔内注射0.2 mL生理盐水、3 mg/kg的DDP及0.8、1.2和2.4 mg/kg的As2O3,观察3AO/DDP细胞在各组裸鼠的致瘤率、裸鼠的死亡率及生存期;采用RT-PCR技术观察As2O3作用停药后1 d、1周、2周裸鼠腹腔移植瘤Fas、N-myc、nm23 H1及MTA1基因表达的变化,并与对照组相比较。结果:As2O3组裸鼠的致瘤率分别为87.5%、62.5%和50.0%,死亡率分别为62.5%、12.5%和0,生存期分别为(75.88±14.21)、(88.88±3.18)和(90.00±0.00)d,与DDP组的100%(致瘤率)、100%(死亡率)、(28.25±2.25)d(生存期)相比,差异有统计学意义,P<0.05;As2O3作用后,裸鼠腹腔移植瘤Fas及nm23 H1基因的表达水平升高,于停药第2周达到高峰,分别与对照组相比,差异均有统计学意义,P值均<0.05;N-myc和MTA1基因的表达在停药第1天和第1周下降,与对照组相比,差异有统计学意义(P<0.05),而第2周反弹升高,与对照组相比,差异无统计学意义,P>0.05。结论:As2O3对人卵巢癌裸鼠腹腔移植瘤具有明显的抑制作用,其机制与Fas和nm23 H1基因与N-myc和MTA1基因的正负调节有关。

13-甲基肉豆蔻酸抗肿瘤作用的研究

目的:研究13-甲基肉豆蔻酸(13-MTD)的抗肿瘤作用。方法:应用台盼蓝排染法、MTT法测定13-MTD对人乳腺癌Bcap-37等6种体外培养肿瘤细胞的细胞毒作用。观察13-MTD对小鼠移植性实体瘤S180的瘤重抑制率,对白血病P388荷瘤鼠的生命延长率。观察13-MTD对正常及免疫抑制小鼠免疫机能的影响。结果:6种肿瘤细胞株的IC50:13.9～33.0μg·mL-1。400mg·kg-1灌胃对小鼠肉瘤S180的瘤重抑制率为71.74%,对白血病P388荷瘤鼠的生命延长率为41.49%。对机体的免疫机能未见抑制作用,对环磷酰胺(CTX)诱发的免疫抑制,不仅不致恶化,个别指标如胸腺系数等还有缓解作用。结论:13-MTD有较强的体内外抗肿瘤活性。对机体免疫机能未见明显影响,对CTX诱发的免疫抑制状态,联用13-MTD未见恶化现象。