Detection of mutations in the p53 gene in human head and neck carcinomas by single strand conformation polymorphism analysis.

Using the polymerase chain reaction (PCR)-based single strand conformation polymorphism (SSCP) analysis, we have examined the highly conserved regions of the p53 gene in 58 biopsy samples of head and neck tumors. Mutations were found in 13/58 (23%) tumor specimens, but not in 6 normal tissues. Ten of 13 mutations were due to single base changes and the remaining 3 were 1- or 8-base deletion mutants. These mutations were clustered in exons 5 and 7 and resulted in amino acid changes. Our results seem to indicate that mutations in the p53 gene contribute to a significant number of cases of the head and neck tumors including 20% of nasopharyngeal carcinoma biopsies. The relationship of Epstein-Barr virus or human papillomavirus and p53 gene mutations in this group of cancers was also analyzed and discussed.     

应用激光技术治疗痔—附1376例报告

本文较详细地介绍了应用激光技术即用CO_2及Nd:YAG激光手术刀治疗各种类型痔的临床观察。我院自1988年应用CO_2及Nd,YAG(以下简称激光手术刀)的技术治疗各种痔1376例均取得满意的治疗效果,治愈率达100％,并对有关问题进行探讨。     

脑血管病患者血清IgE型免疫复合物的检测

本文用胶固素酶联免疫吸附试验检测了１６例缺血性脑血管病（ＩＣＤ）患者，１４例出血性脑血管病（ＨＣＤ）患者和２０例健康正常人的血清ＩｇＥ型循环免疫复合物（ＣＩＤ）水平。结果显示ＩＣＤ组和ＨＣＤ组ＩｇＥ－ＣＩＣ水平明显高于正常组（分别为Ｐ＜０．００１和Ｐ＜０．０５）。ＩＣＤ组与ＨＣＤ组间没有显著差异（Ｐ＞０．０２）。提示脑血管病的发生与ＩｇＥ－ＣＩＣ的形成有关。     

Structure-activity relationships for inhibition of papain by peptide Michael acceptors.

Two series of peptidyl Michael acceptors, N-Ac-L-Phe-NHCH2CH = CH-E with different electron withdrawing groups (E = CO2CH3, 1a; SO2CH3, 1b; CO2H, 1c; CN, 1d; CONH2, 1e; and C6H4-p-NO2, 1f) and R-NHCH2CH = CHCOOCH3 with different recognition and binding groups (R = N-Ac-D-Phe, 2a; N-Ac-L-Leu, 3a; N-Ac-L-Met, 4a; PhCH2CH2CO, 5a; PhCO, 6a), were synthesized and evaluated as inactivators against papain. It was found that the inhibition of papain by peptidyl Michael acceptors is a general phenomenon and that the intrinsic chemical reactivity of the E group in the Michael acceptors has a direct effect on the kinetics of the inactivation process as reflected in k2/Ki. At pH 6.2, the reactivity of papain toward the Michael acceptors is about 283,000-fold higher than the reactivity of the model thiol 3-mercaptopropionate. This large increase in reactivity is attributable to at least 2 factors; one is the low apparent pKa of Cys-25 of papain, and the other is the recruitment of catalytic power by specific enzyme-substrate interactions. The unexpectedly high reactivity of 1c (E = COOH) was rationalized by proposing a direct interaction of the acid group with His-159 in the active site of papain. The unexpected inactivity of 1f (E = C6H4-p-NO2) as a Michael acceptor and its very powerful competitive inhibition of papain were rationalized by molecular graphics which showed the nitrophenyl moiety rotated out of conjugation with the olefin and interacting instead with the hydrophobic S1' region of papain. A plot of log (k2/Ki) for 1a-6a vs log (kcat/Km) for analogous R-Gly-p-NA substrates was linear (r = 0.98) with slope of 0.83, suggesting that binding energy from specific enzyme-ligand interactions can be used to drive the self-inactivation reaction to almost the same extent as it is used to drive catalysis.     

儿童阻塞性睡眠呼吸暂停低通气综合征的治疗

目的探讨儿童阻塞性睡眠呼吸暂停低通气综合征(obstructive sleep apnea hypopnea syndrome，OSAHS)患儿的治疗方法和疗效观察。方法经多道睡眠监测(polysomnography，PSG)确诊的4～12岁OSAHS患儿59例：扁桃体切除和(或)经口内镜(内窥镜，下同)引导下腺样体刮除54例；选择长期正压通气治疗(continue positive airway pressure，CPAP)2例；保守治疗3例。采用儿童OSAHS生活质量调查表(quality of life for children with obstructive sleep apnea 18 items，OSA-18)对患儿进行治疗前后的随访。结果围手术期无术后出血、急性呼吸道梗阻发生。随访12～18个月，手术患儿无鼻咽闭锁、咽鼓管功能障碍、腺样体残留等并发症；OSA-18调查评分显示：治疗后76．3％(45例)的患儿生活质量总体指标，88．1％(52例)的患儿睡眠呼吸障碍，67．8％(40例)的患儿身体症状得到显著改善。长期CPAP治疗的有效治疗压力在5．6～7．8cm H2O左右。3例保守治疗者略有改善。结论手术切除引起上气道阻塞的肥大的扁桃体和(或)腺样体是儿童OSAHS有效的治疗手段之一，纤维鼻咽镜检查、头颅侧位X线摄片有助于手术适应证的确定。经口内镜引导下腺样体刮除术具有直视下操作，视野清晰，切除彻底，可避免损伤周围重要结构的特点。     

前列腺癌去雄激素治疗不良反应的预防和处理

目的观察去雄激素治疗前列腺癌的不良反应,并探讨其预防和治疗。方法回顾性分析1998年7月-2006年1月112例去雄激素治疗晚期前列腺癌的临床资料。结果112例患者中,97例完成了不良反应的调查。随访3-36月,去雄激素治疗后潮热、性功能障碍、病理性骨折发生率分别为46％、75％、4％;患者潮热、精神疲乏、四肢乏力、纳差症状明显加重(P<0．05);性功能明显减退(P<0．05)。12例潮热症状严重者使用抗抑郁药博乐欣(25mg,tid)1-2周症状减轻。7例有骨转移性疼痛或严重骨质疏松患者,应用唑来膦酸4mg静脉滴注,每45d一次,骨痛症状缓解。结论去雄激素对前列腺癌患者生活质量有一定影响。博乐欣可减轻患者潮热症状,唑来膦酸可预防和治疗去雄激素相关的骨质疏松并发症。     

开放手术观察腰椎间盘突出症溶核失败45例分析

目的 通过开放手术观察分析椎间盘髓核化学溶解术治疗腰椎间盘突出症失败原因。方法 收集溶核失败的腰椎间盘突出症45例行开放手术治疗。结果 术中见45例硬膜外脂肪完全消失，43例髓核未见溶解，2例髓核溶解呈糊状但未被吸收，21例伴有侧隐窝狭窄，15例突出物与神经根粘连，20例黄韧带增厚，2例椎管骨性狭窄，14例突出物钙化。结论 腰椎间盘突出症病变间隙合并有侧隐窝狭窄、神经根粘连、椎管狭窄、突出物钙化等，不是溶核治疗的适应证。