肝动脉阻断结合外放射治疗大鼠肝移植瘤的初步观察

[目的]观察肝动脉阻断法结合外放射治疗肝肿瘤的效果。[方法]采用大鼠肝内移植Walker256肿瘤模型,以肝动脉结扎(HAL)的方法阻断肝动脉血供。荷瘤大鼠分为对照组、HAL组、HAL 外放射(RT)组。观察治疗后肝内肿瘤的大小变化,原位杂交法检测肿瘤组织VEGFmRNA表达水平,免疫组化法检测肿瘤组织PCNA表达。[结果]对照组、HAL组、HAL RT组肿瘤体积分别为(0.88±0.33)cm3、(0.53±0.43)cm3、(0.33±0.32)cm3,HAL组和HAL RT组的肿瘤生长抑制率分别为39.8%、62.5%。HAL RT组的肿瘤体积较对照组明显缩小(P<0.01),而且,HAL RT组PCNA及VEGFmRNA表达水平与对照组相比明显下降(P<0.05)。[结论]肝动脉阻断结合外放射综合治疗较单独的动脉阻断治疗可提高治疗效果。     

晚期胰腺癌患者三维适形放疗联合热疗的疗效观察

目的探讨晚期胰腺癌患者三维适形放射疗法联合热疗的临床疗效。方法采用三维适形放疗联合热疗技术对50例晚期胰腺癌患者进行治疗。对于直径〈5cm的肿瘤,每周放疗3次,每次3．8～4．5Gy,4周总剂量为45～54Gy;对于直径〉5cm的肿瘤,每周放疗5次,每次2Gy,6周总剂量为60—65Cy。对全部患者在放疗后1h内进行热疗。结果患者在治疗后2～3个月进行CT检测复查,治疗后总有效率达70．0％,腹痛总缓解率为100％,黄疸总消退率84．6％。治疗后两年随访结果表明,生存率为60．0％。结论采用三维适形放疗与热疗联合治疗晚期胰腺癌的疗效好,不良反应小,止痛效果好,值得临床推广。     

A high and sustained response rate in refractory or relapsing low-grade lymphoma masses after low-dose radiation: analysis of predictive parameters of response to treatment

PURPOSE: To determine the efficacy of small doses of radiation in patients with recurrent or refractory low-grade lymphoma masses. METHODS AND MATERIALS: Patients with refractory or relapsing low-grade lymphoma masses. The two largest diameters of the tumor mass were measured, whenever possible, before and after treatment. A dose of 4 Gy of radiotherapy was delivered to tumor sites in 2 fractions. Patients were evaluated for response 1-4 months later and at regular follow-up visits. RESULTS: Forty-eight patients with low-grade lymphomas according to the working formulation received low-dose radiotherapy between March 1987 and November 1998. Most patients had advanced disease at the time of radiation treatment, and 80% had received at least two chemotherapy regimens before treatment. The median interval between the initial diagnosis and radiotherapy was 2.7 years (range 0-22 years). Low-dose radiation was delivered to 135 tumor sites. Nodal and extranodal tumor sites represented 80% and 20% of masses, respectively. An objective response was obtained in 81% of the sites, with 57% attaining a complete remission. The 2-year actuarial freedom from local progression (FFLP) rate was 56% (95% CI, 46-66%). Tumor masses 5 cm), the number of chemotherapy regimens (0-1 vs. more), and age at time of radiation treatment (< or =65 years or > 65 years) were significant predictive parameters of response to treatment. CONCLUSIONS: In this retrospective study, low-dose radiation proved efficient, with long-lasting effects in the majority of patients with recurrent or refractory low-grade lymphomas. This simple and nontoxic treatment should be investigated prospectively in patients with advanced disease and a low tumor burden not immediately warranting chemotherapy.     

167例中晚期食管癌放化疗的疗效及预后

目的：探讨食管癌三维放疗+化疗生存情况及预后影响因素。方法：收集在我院首次行放化疗的167例中晚期食管癌患者的临床资料,并进行回顾性分析。放疗设备为 Elekta -6mV X 线直线加速器,放疗方案采用三维适形放疗（3- DCRT）或调强放疗（IMRT）,放疗中位剂量为62Gy。化疗方案为氟尿嘧啶+顺铂或多西紫杉醇+顺铂,分别行4～6周期。采用 SPSS 17.0软件行 Kaplan - Meier 法计算总生存率（OS）,并绘制生存曲线,Log - rank 法检验 P 值,对 P <0.05的单因素行 Cox 回归多因素分析。结果：全组患者1年、3年、5年生存率分别为73.7%、51.5%、26.3%,中位生存时间36个月。单因素结果显示治疗方式、肿瘤位置、肿瘤长度、肿瘤分期、放疗剂量、放射性肺炎为影响食管癌患者生存的主要因素（P =0.022、0.017、0.040、0.001、0.000、0.002）。Cox 多因素分析发现治疗方式、肿瘤长度、肿瘤分期、放射性肺炎为影响食管癌预后生存的独立影响因素（P =0.018、0.001、0.004、0.000）。结论：同步放化疗可明显提高中晚期食管癌患者总生存率,当肿瘤长度<5cm、肿瘤分期越早、放射性肺炎级别越低时患者预后较佳。     

沙利度胺联合放射治疗对结肠癌小鼠移植瘤生长及放射敏感性的影响

背景与目的：沙利度胺能有效增强肿瘤对放射的敏感性,但作用机制尚不清楚。本研究探讨沙利度胺对人结肠癌小鼠移植瘤放射敏感性的影响,并探讨其协同抑制效应的机制。方法：建立colon26结肠癌移植瘤模型,将32只小鼠随机分为对照组;单纯沙利度胺组(T组);单纯放疗组(R组);沙利度胺+放疗组(T+R组);从治疗当天开始,隔日测量肿瘤体积,绘制肿瘤生长曲线,治疗结束时测量肿瘤体积,计算抑瘤率,处死小鼠后剥离瘤体,采用免疫组化法测定各组肿瘤组织微血管密度(microvesseldensity,MVD)。结果：治疗第22天,对照组、T组、R组和T+R组移植瘤平均体积分别为(4.97±1.20)cm3、(2.90±0.92)cm3、(2.66±0.88)cm3和(1.89±0.76)cm3;肿瘤生长抑制率分别为41.7%、46.5%和61.9%,T+R组移植肿瘤抑瘤率明显高于其他各组(P＜0.05);与R组比较,T+R组的放射增敏率为2.27;沙利度胺联合放射治疗能显著抑制肿瘤组织MVD生成：T+R组的平均MVD较对照组下降了46.8%,下降程度明显高于T组(40.7%)和R组(37.7%,P＜0.05);且T+R组肿瘤组织中出现较多的坏死,坏死细胞数明显高于对照组(P＜0.05)。结论：沙利度胺可以增强结肠癌小鼠移植瘤的放射敏感性,其机制可能与抑制移植瘤血管的生成有关。     

巨块型宫颈癌肿瘤中心前程同步加量调强放疗止血效果的观察

目的 探讨肿瘤中心前程同步加量调强放疗治疗巨块型宫颈癌大出血的有效性和安全性。方法 21例伴有阴道大出血的巨块型宫颈癌患者,前程(前3次)给予肿瘤中心(宫颈大肿块边界内收2 cm的范围)同步加量放疗15 Gy分3次后给予常规分割剂量(2 Gy/次),肿瘤周边和盆腔全程采用常规分割照射剂量46 Gy分23次。同步化疗采用顺铂25 mg/m²每周方案。外照射结束后给予腔内放疗20 Gy/4次。结果 首程大剂量放疗后24 h内阴道出血量较前减少50%,1周内阴道出血渐止,止血率100%。结论 采用肿瘤中心同步加量调强放疗是巨块型宫颈癌阴道大出血的有效治疗措施。     

伽玛刀放疗联合局部热疗治疗肝癌与单纯放疗对比的临床回顾性分析

目的回顾性分析肝癌伽玛刀放疗联合热疗的疗效是否较单纯放疗的疗效更有优势。方法 回顾性分析荆门市第二人民医院2009年5月—2011年12月原发性肝癌病例65例, 将患者随机分为联合组35例及放疗组30例, 放疗组采用伽玛射线放射治疗, 联合组采用伽玛射线放射治疗, 并且在放疗结束后1小时内给予肝脏肿瘤局部热疗。3个月后进行近期疗效判定, 观察生存质量改善情况、生存率及放疗毒副反应。结果 伽玛刀放疗联合局部热疗治疗肝癌较单纯放疗局部缓解率高、生存质量及症状缓解率高、毒副反应低、总生存期(OS)稍有延长。结论 伽玛刀放疗联合局部热疗较单纯伽玛刀放疗在肿瘤缓解率、生存质量、毒副反应及生存期上都有优势。     

原发性肝癌三维适形放射治疗后长期生存1例报告及文献复习

目的:探讨三维适形放疗后原发性肝癌肿瘤退缩速度及肝脏大小形态、AFP及肝功等方面变化特征,并分析放疗剂量及分割方式。方法:对1例原发性肝癌三维适形放疗后长期随访,并复习文献。结果:原发性肝癌在放疗后3个月肿瘤明显退缩,放疗后2年内病灶仍可继续缩小。大分割放疗方案在肝功能Ch ild-pugh A级及病灶较小的病人中实施耐受性好、安全有效。结论:原发性肝癌的放射敏感性相当于低分化鳞癌,放疗后2年内病灶仍可继续缩小。大分割放疗方案在肝功能好病灶较小的病人中实施较安全。     

VCT在原发性肝癌放射治疗中的作用

目的:探讨64层螺旋CT(容积CT/VCT)对原发性肝癌放疗的指导价值.方法:回顾分析27例经病理证实的原发性肝癌,复查放疗前后肝癌的VCT,并与常规平扫、增强CT进行比较,观察病变检出率、肿瘤靶区体积、放疗前后肝癌VCT变化与放疗剂量的关系.结果:27例中,发现新病灶3例,24例均为单发病灶.增强CT和VCT可以明显提高靶区的准确性.放疗前后肝癌VCT体积变化与放疗剂量存在量-效关系.结论:增强CT及VCT能较好地检出原发性肝癌多发病灶且明显提高靶区勾画的准确性.放疗前后肝癌VCT体积变化有望作为肝癌临床放疗敏感性指标.     

Post-mastectomy radiotherapy in pT3N0M0 breast cancer: is it needed?

BACKGROUND AND PURPOSE: It is not been established whether breast cancer patients who have a primary tumor 5 cm or larger but no axillary nodal or distant metastases at the time of the diagnosis (pT3N0M0) benefit from post-operative radiation therapy after mastectomy. MATERIAL AND METHODS: We identified 81 patients with T3N0M0 breast cancer out of the total of 4190 breast cancer patients treated in one university radiotherapy department from 1987 to 1994 from the department patient registry, and examined the clinical records and histopathological slides. RESULTS: Only 38 of the 81 patients had true pT3N0M0 breast cancer after the review (0.9% of the 4190 new breast cancer patients registered in the department from 1987 to 1994). Three (60%) of the five patients who were not treated with post-operative radiation therapy developed locoregional recurrence of breast cancer as compared with only three (9%) of the 33 patients who were given post-operative radiotherapy during a median follow-up of 58 months (P = 0.0003). Patients who were given post-operative radiotherapy had a better distant disease-free survival rate (P = 0.04) and overall survival rate (P = 0.03) than the ones who were not treated with radiation therapy after surgery. Of the 29 patients who had chest wall irradiation only, one had in-field recurrence at the surgical scar, one both at the scar and the unirradiated axilla, and only one (3%) solely in the axilla. CONCLUSIONS: Patients with true pT3N0M0 breast cancer are rare. The results suggest that women with pT3N0M0 breast cancer benefit from post-operative radiotherapy, but the value of irradiating the dissected ipsilateral axilla remains unsettled.     

Whole-liver Radiotherapy Concurrent with Chemotherapy as a Palliative Treatment for Colorectal Patients with Massive and Multiple Liver Metastases: a Retrospective Study

The purpose of this study was to investigate whether whole-liver radiotherapy plus a tumor-boost dose withconcurrent chemotherapy is beneficial for colorectal cancer patients with massive and multiple liver metastases.From January 2007 to December 2012, 19 patients who exhibited massive (with a longest diameter > 5 cm) andinvasive liver metastases and multiple metastases were treated with radiotherapy and concurrent chemotherapy.The total radiation dose was 53.4 Gy (range 38.8 Gy-66.3 Gy). All of the patients received a continuous intravenousdose of 5 fluorouracil (5-FU) 225 mg/m2 concurrently with radiation. The median survival time was 19 months.The 1- and 2- year overall survival rates were 78.3% and 14.3%, respectively. Of all of the patients who presentedwith abdominal pain, 100% experienced a decrease in pain. Decreases in the rates of ascites and jaundice wereconfirmed by ultrasound and bilirubin levels. No cases of Grade 4 or 5 acute or late toxicity were recorded.There were only two cases of Grade 3 toxicity (elevated bilirubin). These data provide evidence that whole-liverradiotherapy plus a tumor-boost dose with concurrent chemotherapy is beneficial for colorectal cancer patientswith massive and multiple liver metastases.     

Prospective evaluation of early lung toxicity following three-dimensional conformal radiation therapy in non-small-cell lung cancer: preliminary results

PURPOSE: Radiation pneumonitis is the restricting complication following lung cancer irradiation. The correlation between dose-volume histograms (DVHs) and pneumonitis, with a clinical, radiological, and respiratory function evaluation was assessed. Special endpoint was the evaluation of respiratory function after three-dimensional conformal radiotherapy (3D-CRT). METHODS AND MATERIALS: Fifty-four patients with non metastatic non-small-cell lung cancer (NSCLC) were treated with a curative intent with 3D-CRT (66 Gy). Thirty-one patients were treated postoperatively (pneumonectomy in 9 patients) for residual tumor or massive nodal involvement (N2 or N3); 23 patients were treated with exclusive radiotherapy. Clinical evaluation, CT scan, and pulmonary functional tests were performed before and 6 weeks after irradiation. The DVHs were calculated applying lung density heterogeneity. RESULTS: Twenty patients had radiation pneumonitis. Irradiation significantly decreased total lung capacity. Volume of the PTV2 (more than 200 cm(3)) was a significant prognostic factor for lung complication. CONCLUSION: DVHs combined with initial pulmonary functional tests can predict pulmonary toxicity and could allow us to adjust volume that received total highest dose with acceptable toxicity.     

Ewing sarcoma-family tumors that arise after treatment of primary childhood cancer

BACKGROUND: Unlike osteosarcoma, the Ewing sarcoma family of tumors (ESFT) has rarely been reported as secondary malignant neoplasms after treatment of childhood cancer. ESFT arising as a second cancer was reviewed and characterized at our childhood cancer center. METHODS: A retrospective review was undertaken of 11,183 patients age <21 years who were treated for a primary cancer between March 1962 and December 2003 at St. Jude Children's Research Hospital. All cases of ESFT were confirmed to have a rearranged EWS gene. RESULTS: Six cases of ESFT (1.3% of 479 second cancers) were identified in patients previously treated for lymphoma (n = 3), leukemia (n = 1), retinoblastoma (n = 1), or Wilms tumor (n = 1). None of these patients had a family history suggestive of a familial cancer syndrome. The median time between diagnosis of primary cancer and diagnosis of ESFT was 5.9 years (range, 3.1-18.3 years). ESFT occurred in typical anatomic locations: rib (n = 2), chest wall soft tissues (n = 2), pelvis (n = 1), and extremity (n = 1). One tumor arose at the margin of a previous radiotherapy field and 1 arose distant from previous radiotherapy fields; all other patients had not received radiotherapy. Three patients are alive at the time of this report, including 2 whose ESFT was diagnosed more than 8 years ago. CONCLUSIONS: ESFT occurs rarely after treatment of a primary cancer during childhood, and most cases do not appear to be related to radiation therapy. Long-term survival can be achieved in some patients, and therefore secondary ESFT should be treated with curative intent.     

A case of locally advanced breast cancer treated with hyperthermia in combination with radiotherapy]

A 59-year-old woman was admitted to our hospital because of massive bleeding from a right breast tumor. The breast tumor had existed for ten years occupied the entire right breast (23 x 20 cm), its central part forming an ulcer 17 x 15 cm in size. Radiotherapy to the right breast and medication with tamoxifen were started, after which five courses of CMF chemotherapy were given. The tumor decreased to 16 x 14 cm, and hyperthermia to the right breast was performed for a total of 87 sessions from January 1999. The irregular protruding portion of the ulcer caused the necrosis, and was sloughed off about one month after hyperthermia. No viable tumor cells were observed in a biopsy taken at 5 months after the start of treatment (40 sessions). A total of 87 hyperthermia sessions were performed, and the ulcer disappeared. For 15 months after the end of hyperthermia, the patient showed a continuous CR. Hyperthermia in combination with radiotherapy or chemotherapy for breast cancer may produce a remarkable effect as in the present case, and may become one choice for medical treatment of locally advanced or recurrent breast cancer.     

鼻咽癌放疗后大出血43例

 目的　探讨鼻咽癌放疗后大出血的相关因素及预防措施。方法　回顾性分析43例鼻咽癌放疗后大出血的临床资料。结果　43例中,肿瘤广泛侵及颅底 39例（90.7 %）,继往曾接受高剂量放疗36例（83.7 %）,接受后程大分割放疗10例（23.3 %）,伴有糖尿病者13例（30.2 %）。结论　肿瘤发生部位是鼻咽癌大出血最主要的因素;放疗剂量、分割方式、糖尿病则是次要的相关因素。对于伴有上述高危因素的患者,应尽量采用超分割,控制总剂量、血糖等,积极地预防比抢救更重要。     

乳腺癌保留乳房手术85例临床疗效及美容效果观察

目的：分析乳腺癌保留乳房手术的疗效及美容效果。方法：从1996年1月至2005年1月为85例乳腺癌患者进行保留乳房手术。肿瘤均为单发,最大直径〈2cm44例,2.0～3.0cm37例,3.1～4.0cm4例。术后进行放、化疗,并进行长期随访。结果：随访时间1～10年,平均随访32.4个月。目前85例均生存,其中术后≥5年32例,≥10年11例,术后5、10年生存率均为100%。85患者例中,82例未发现复发及转移;3例术后出现复发或转移,其中1例术后3年同侧腋窝肿瘤复发,1例术后8年出现患侧腋窝淋巴结转移及肺、肝转移,1例术后1年出现肝转移。美容效果良好为96.5%（82/85）,一般为3.5%（3/85）。结论：采用保留乳房手术治疗乳腺癌,术后疗效满意,同时具有良好的美容效果。     

Results of radiation therapy for unresected soft-tissue sarcomas

PURPOSE: Definitive radiotherapy is uncommonly used in the management of soft-tissue sarcoma (STS). The purpose of the study was to evaluate the results of radiotherapy for unresected STSs treated in a single institution. METHODS AND MATERIALS: Between 1970 and 2001, 112 patients with STSs underwent radiotherapy for gross disease. Locations of the tumor were 43% in the extremities, 26% retroperitoneal, 24% in the head and neck, and 7% in the truncal wall. Histologic grades were 11% G1 and 89% G2 to G3. Median size of tumor at radiotherapy was 8 cm (range, 1-30 cm). Median radiation dose was 64 Gy (range, 25-87.5 Gy). Twenty percent of patients received chemotherapy. Local control (LC), disease-free survival (DFS), and overall survival (OS) rates were evaluated in univariate (log-rank) and then multivariate (Cox model) analysis to determine prognostic factors for STS. RESULTS: Median follow-up for patients is 139 months (range, 30-365 months). The 5-year actuarial LC, DFS, and OS were 45%, 24%, and 35%, respectively. Tumor size at radiotherapy and radiation dose influenced LC, DFS, and OS in univariate analysis. LC at 5 years was 51%, 45%, and 9% for tumors less than 5 cm, 5 to 10 cm, and greater than 10 cm, respectively. Patients who received doses of less than 63 Gy had 5-year LC, DFS, and OS rates of 22%, 10%, and 14%, respectively, compared with 5-year LC, DFS, and OS rates of 60%, 36%, and 52%, respectively, for patients who received doses of 63 Gy or more. AJCC stage was related to the OS and DFS without statistically significant influence on LC. Use of chemotherapy, histologic grade, age, and location did not influence results. In multivariate analysis, LC was related to total dose (p = 0.02), T size at radiotherapy (p = 0.003), and AJCC stage (p = 0.04); DFS was related to total dose (p = 0.007), T size at radiotherapy (p = 0.01), and AJCC stage (p < 0.0001); and OS was related to AJCC stage (p = 0.0001) and total dose (p = 0.002), but not to T size, at radiotherapy. Major radiotherapy complications were noted in 14% of patients; 27% of patients who received doses of 68 Gy or more had these complications compared with 8% of patients treated with doses of less than 68 Gy. CONCLUSIONS: Definitive radiotherapy for STS should be considered in clinical situations where no acceptable surgical option is available. Higher radiation doses yield superior tumor control and survival. A rise in complications occurs in patients who receive doses of 68 Gy or more, which provides a therapeutic window for benefit in these patients.     

Second malignancies after prostate brachytherapy: incidence of bladder and colorectal cancers in patients with 15 years of potential follow-up

PURPOSE: To report the incidence of second bladder and colorectal cancers after prostate brachytherapy. METHODS AND MATERIALS: This review included 125 patients treated with I-125 brachytherapy alone, and 223 patients who received supplemental external beam radiation therapy. Median follow-up was 10.5 years. Patients were followed for the development of lower genitourinary and colorectal cancers. Second malignancies arising five years after radiation therapy were defined as being potentially associated with treatment; observed rates were then compared with age-matched expected rates according to Surveillance, Epidemiology, and End Results data. RESULTS: Five years out of treatment, there were 15 patients with a second solid tumor, including bladder cancer (n = 11), colorectal cancer (n = 3), and prostatic urethra cancer (n = 1). The incidence of second malignancy was no different in patients treated with brachytherapy alone (1.6%) vs. those receiving external beam radiotherapy (5.8%, p = 0.0623). There were more observed bladder cancers compared with those expected (relative risk, 2.34, 95% confidence interval 0.96-3.72; absolute excess risk 35 cancers per 10,000 patients). Relative risk did not significantly change over increasing follow-up intervals up to 20 years after treatment. CONCLUSIONS: There may be an increased but small risk of developing a second malignancy after radiation therapy for prostate cancer. This outcome could be related to radiation carcinogenesis, but more vigilant screening and thorough workup as a result of radiation side effects and predisposing conditions (e.g., genetic and environmental factors) in many of the patients found to have second malignancies likely contributed to the higher number of observed malignancies than expected.     

肿瘤靶体积对Ⅲ期非小细胞肺癌三维适形放疗长期疗效的影响

目的 分析肿瘤靶体积大小对Ⅲ期非小细胞肺癌（NSCLC）三维适形放疗（3D-CRT）长期疗效的影响。方法 收集2000年8月-2004年12月行三维适形放疗的72例Ⅲ期NSCLC患者资料。其中,ⅢA期29例、ⅢB期43例。单纯放疗32例、放疗联合化疗40例;采用前程常规+后程三维适形放疗者28例、全程三维适形放疗者44例;中位等效生物剂量6 625 cGy(范围5 000~7800 cGy)。采用剂量体积直方图（DVH）计算肿瘤靶体积（GTV）、临床靶体积（CTV）、计划靶体积（PTV）。放射性肺炎和放射性食管炎采用RTOG标准评价。结果 随访5年,随访率95.8%。放疗后CR 14例、PR 42例、SD 16例,1、3、5年总生存率及中位生存期分别为45.8%、15.3%、10.5%和10.2月 。按照GTV中位值155 cm3分为两组,只有GTV＞155 cm3组2级以上放射性肺炎发生率高（P＜0.05）;而性别、年龄、T、N、TNM、等效生物剂量、照射方式、化疗、近期疗效和放射性食管炎,两组间分别比较,差异无统计学意义（P＞0.05）。GTV≤155 cm3和＞155 cm3放疗后1、3、5年生存率和中位生存期分别为61.1%、19.4%、16.2%、17月和30.6%、11.1%、4.2%、9月（χ²=5.16,P=0.023）。CTV和PTV按照中位值分两组,两组间生存率的比较差异均有统计学意义（P＜0.05）。全组预后单因素分析显示GTV、CTV、PTV、近期疗效（CR+PR/SD）与预后生存有关（P＜0.05）;多因素分析显示GTV和近期疗效是独立预后因素。结论 肿瘤靶体积大小是影响Ⅲ期非小细胞肺癌放疗预后的重要因素,近期疗效也影响预后生存。      

Smac表达水平对预测直肠癌术前放疗敏感性的临床意义

背景与目的:直肠癌患者术前放疗效果个体差异大,寻找与放疗敏感性相关的生物学标志物,对于直肠癌的个体化治疗有着重要的临床意义。本研究旨在探讨Smac蛋白表达与直肠癌术前放疗病理反应程度的关系,评价Smac蛋白表达水平预测直肠癌术前放疗敏感性的价值。方法:收集我院2002年1月至2006年12月期间接受术前放疗的42例直肠癌病例资料,评价其放疗后病理反应程度,免疫组织化学方法检测手术治疗前活检标本和手术后切除标本中Smac蛋白的表达水平,分析活检组织中Smac蛋白表达水平与病理反应程度的关系,以及放疗前后蛋白表达水平的变化。结果:直肠癌术前放疗后病理反应良好,有效率达73.8%,联合放化疗者优于单纯放疗者(P<0.05);而直肠癌组织中Smac蛋白的表达水平与单纯术前放疗效果密切相关,Smac蛋白高表达者术前放疗有效率(83.3%)明显优于低表达者(25.0%),并且肿瘤组织放疗后Smac蛋白表达水平有明显下降。结论:直肠癌组织中Smac蛋白表达水平可作为术前放疗敏感性的预测因子。