125I粒子平面布源剂量学研究

目的 探讨同活度、同数量125I粒子单平面不同排列的剂量学效应.方法 利用计算机三维治疗计划系统（3D-TPS）模拟9颗2.035×107Bq125I粒子的9种分布模式：按粒子排列间距（以x轴、y轴方向计,单位为cm）分x0.5、y0.5,x0.5、y1.0,x0.5、y1.5,x1.0、y1.0,x1.0、y1.5,x1.5、y1.5,x0.5、y0.5（2）1.0（即第1,3列粒子y向间距0.5 cm,第2列粒子间距y向1.0 cm）,x0.5、y1.0（2）0.5（即第1,3列粒子y向间距1.0cm,第2列粒子y向间距0.5 cm）,x1.0、y1.0（2）0.5（即第1,3列粒子y向间距1.0 cm,第2列粒子y向间距0.5 cm）.用专业图像分析软件计算出40,80,130,145和200 Gy剂量分布曲线及曲线包含的面积、长径、短径,再用公式计算：单位面积的医疗费用=（单颗粒子价格＋单颗粒子手术费）×粒子数/等剂量曲线包含面积.结果 粒子不同分布时相同等剂量曲线包含的面积、长径、短径和单位面积的医疗费用存在差异.40,80,130,145和200 Gy等剂量曲线内面积最大的粒子排列分别为：x1.5、y1.5,x1.0、y1.0,x1.0、y1.0,x0.5、y1.0,x0.5、y1.0,对应的面积分别为：1672.31,849.08,524.50,481.20和350.92 mm2.结论 同活度、同数量125I粒子的不同分布模式直接影响周边剂量.     

氢氧化锂吸收剂用于清除闭式/半闭式潜水呼吸器二氧化碳的实验研究

Objective To investigate the applicability of lithium hydroxide ( LiOH) absorbent in closed/semi-closed diving apparatus. Methods One LiOH absorbent and 2 classical sodium lime absorbents ( sodium lime 1 and sodium lime 2) were chosen to carry out unmanned experiments by using the manual lung and a closed breathing apparatus. Temperature in the canister and CO2 level at the outlet of the canister were timely monitored and recorded. When CO2 level in the inhaled gas exceeded 1.5%, the experiment was terminated, and the time when CO2 levels reached at 0. 5% and 1. 5% was recorded. The amounts of absorbents filled, temperatures and the time when CO2 levels reached at 0. 5% and 1.5% were recorded. Results The weight of the LiOH absorbent was minimal (1113. 5 g), which was obviously less than the classical absorbent, sodium lime 1 and sodium lime 2( 1845.0 g and 1855.5 g),which was a disadvantage to the positive buoyancy of the diving apparatus. With the LiOH absorbent, the time for CO2 to reach 0.5% (T0.5) and 1.5% (T1.5) was 86.00 ± 1. 63 min and 119. 00 ± 2. 94 min respectively. While for sodium lime 1, the time for T0.5 and T1.5 were 55. 00 ±0. 82min and 62. 00 ± 1. 63min and for sodium lime 2, the time for T0.5 and T1.5 were 57. 00 ± 2.45min and 65. 00 ± 1. 63min respectively. The T1.5 and T1.5 of the LiOH absorber were obviously longer than those of sodium lime 1 and sodium lime 2 (P＜0. 05). The maximum temperature in the LiOH canister was 191. 5℃,which was 2. 56 times greater than that of sodium lime 1 (74. 8℃) ,and 2. 29 times greater than that of sodium lime 2 (83. 6 ℃ ). Conclusions This kind of LiOH absorber might not be suitable to closed/semi-closed diving apparatus.     

γ射线诱发人外周血淋巴细胞T细胞受体基因突变剂量-效应和时间-效应关系

目的 初步建立T细胞受体(TCR)突变频率的剂量-效应和时间-效应模型,为探讨TCR作为估算辐射生物剂量计提供依据.方法 将10名健康成年人的外周血淋巴细胞分成两组.第1组4人(男性)的外周血淋巴细胞分别给予0、0.5、1.0、1.5、2.0、2.5、3.0、3.5、4.0和5.0 Gv γ射线照射,用于拟合剂量-效应曲线,第2组6人(男女各半)的外周血淋巴细胞给予2 Gy γ射线照射,用于拟合时间-效应曲线.用流式细胞仪进行计数检测,计算TCR基因突变频率.结果 γ射线照射诱发TCR MF的辐射剂量-效应曲线,拟合最佳的模型为二次方程模型:TCR MF=92.14+22·61D2(R2adj=0.65);γ射线照射诱发TCR MF的辐射时间-效应曲线,拟合最佳的模型为二次多项式方程模型:TCR MF=3.74+743.66T+308.64T2(R2adj=0.79).结论 0～5 Gy范围内TCR基因突变频率与辐射剂量存在剂量-效应关系.照后4 d内TCR基因突变频率随时间的延长而继续增加,存在时间-效应关系.

Abstract：

Objective To study the dose-effect relationship and time-effect relationship of T cell receptor (TCR) gene mutation induced by γ-rays in lymphocytes of human peripheral blood.Methods Samples of peripheral blood were collected from 10 healthy adults and lymphocytes were separated.Four samples from males used to fit time-effect curve were exposed to γ-rays at the doses of 0,0.5,1.0,1.5,2.0,2.5,3.0,3.5,4.0,and 5.0 Gy,respectively,and 6 samples from 3 males and 3 females used to fit dose-effect curves were exposed to γ-rays of the dose of 2 Gy.Flow cytometry was used to detect the mutation frequency of TCR gene (TCR MF).Radiation dose-effect curves and time-effect curves were fitted and optimal mathematical models were selected respectively.Results The optimal mathematical model for radiation dose-effect was quadratic equation model:TCR MF = 92.14 + 22.61D2 (R2adj = 0.65).The optimal mathematical model for radiation time-effect was quadratic polynomial equation model:TCR MF = 3.74 + 743.66T + 308.64T2 (R2adj = 0.79).Conclusions TCR MF is increased as the γ-rayirradiation dose increases within the range of 0-5 Gy,and TCR MF is increased with the lapse of time within the range of 4 days after γ-ray radiation.     

热释光剂量计测量125Ⅰ粒子源植入中职业人员剂量方法研究

目的 研究用热释光剂量计(TLD)测量并计算125Ⅰ粒子源植入中职业人员器官和组织接受的吸收剂量及有效剂量方法.方法 用60Co γ射线开展TLD稳定性等相关性能实验.用125Ⅰ粒子源照射一组TLD片,建立空气比释动能标准剂量曲线.将TLD片分别贴在粒子源植入过程中职业人员铅衣内外甲状腺等13个部位,测量平均吸收剂量,计算器官和组织的吸收剂量和有效剂量.结果 3例前列腺癌粒子源植入术中,职业人员铅衣外器官和组织吸收剂量0.02～3.80 μGy,有效剂量0.06～1.81 μSv;铅衣内最高吸收剂量2.35 μGy,有效剂量0.02 μSv,屏蔽65.9%以上γ射线.3例脑癌中,职业人员铅衣外器官和组织吸收剂量0.23～11.31 μGy,有效剂量0.88～4.07 μSv;铅衣内最高吸收剂量2.22 μGy,有效剂量0.09μSv,屏蔽54.5%以上射线.3例肺癌中,职业人员铅衣外器官和组织吸收剂量0.03～14.78 μGy,有效剂量0.35～7.59 μSv;铅衣内最高吸收剂量4.09 μGy,有效剂量0.22 μSv,屏蔽58.4%以上射线.2例纵隔癌中,职业人员铅衣外器官和组织的吸收剂量为0.06～74.91 μGy,有效剂量0.83～17.96 μSv;铅衣内最高吸收剂量10.29 μGy,有效剂量0.50 μSv,屏蔽85%以上射线.1例卵巢癌中,职业人员铅衣外器官和组织吸收剂量0.09～14.29 μGy,有效剂量2.40～4.50 μSv;铅衣内最高吸收剂量7.77 μGy,有效剂量0.12 μSv,屏蔽33.4%以上射线.植入1例眼睛癌中,职业人员铅衣外器官和组织吸收剂量为2.20～39.84 μGy,有效剂量4.48～10.06 μSv;铅衣内最高吸收剂量5.19 μGy,有效剂量0.16 μSv,屏蔽54.6%以上射线.结论 用TLD监测粒子源植入中职业人员剂量的方法简单易行,是保护近距离植入粒子源治疗中医务人员健康的有效措施.

Abstract：

Objective To explore the method for measuring and calculating both absorbed dose and effective dose received in organ and tissues of occupational workers by using TLDs for the implantation of 125Ⅰ seed sources.Methods The experiments with 60Co γ-rays were carried out for the stability.A group of TLD chips was exposed to 125Ⅰ seed sources to establish standard dose curve for air kerma.During the 125Ⅰ seed implantation, the TLD chips were pasted to 13 locations like thyroid inside and outside the lead aprons worn by occupational workers to measure average absorbed dose and calculate the absorbed doses and effectives to organs and tissues.Results For 3 cases of prostate cancers with implantation of 125Ⅰ seeds, the worker's organs and tissues received the absorbed dose 0.02 -3.80 μ Gy and effective dose 0.06- 1.81 μSv outside lead aprons and the highest absorbed dose 2.35 μ Gy and effective 0.02 μSv inside lead aprons, respectively, with more than 65.9% of rays shielded.For 3 cases of brain cancers with implantation of 125Ⅰ seeds, the workers received the absorbed dose 0.23 - 11.31 μGy and effective dose 0.88 - 4.07 μSv outside lead aprons and the highest absorbed dose 2.22 μ Gy and effective dose 0.09 μSv inside lead aprons, respectively, with more than 54.5% of rays shielded.For 3 cases of lung cancers with implantation of 125Ⅰ seeds, the workers received the absorbed dose 0.03 - 14.78 μGy and effective dose 0.35 -7.59 μSv outside lead aprons and the highest absorbed dose 4.09 μGy and effective 0.22 μSv inside lead aprons, respectively, with more than 58.4% of rays shielded.For 2 cases of mediastinum cancers with implantation of 125Ⅰseeds, the workers received the absorbed dose 0.06 - 74.91 μGy and effective dose 0.83 - 17.96 μSv outside lead aprons and the highest absorbed dose 10.29 μGy and effective 0.5 μSv inside lead aprons, respectively, with more than 85% of rays shielded.For one case of ovary cancer with implantation of 125Ⅰ seeds, the worker received the absorbed dose 0.09 - 14.29 μGy and effective dose 2.40 - 4.50 μSv outside lead aprons and the highest absorbed dose 7.77 μGy and effective 0.12 μSv inside lead aprons, respectively, with more than 34% of rays shielded.For one case of eye cancer with implantation of 125Ⅰ seeds, the workers received the absorbed dose 2.2 -39.84 μGy and effective dose 4.48 - 10.06 μSv outside aprons and the highest absorbed dose 5.19 μGy and effective 0.16 μSv inside aprons, respectively, with more than 54.6 % of rays shielded.Conclusions The method of using TLDs to measure the doses to the occupational workers in the course of the implantation of 125Ⅰ seed sources is simple and easy to operate.It would be an effective approach to protecting medical workers in the case of brachytherapy.     

两种放射治疗计划系统的对比验证研究

目的 对比Prowess治疗计划系统(TPS)以检验Neptune 3D-RTPS-A放射治疗计划系统在临床应用过程中的准确性和安全性.方法 选取2009年9月至2010年5月在Prowess TPS行三维放疗计划设计并顺利完成适形放疗的30例肿瘤病例,将Prowess TPS中勾画的外轮廓、危及器官、靶区导入到Neptune TPS,并在Neptune TPS中设置和Prowess TPS相同的治疗计划参数,对比2种TPS计算的结果数据.结果 使用Neptune 3D-RTPS-A三维治疗计划系统能够顺利完成所选30例肿瘤病例的放射治疗计划设计.与Prowess TPS比较,源皮距SSD差异＜0.5%;机器跳数(MU)差异＜0.5%;等中心剂量差异＜2%;30%、50%、70%、80%、90%5条等剂量线包绕面积差异＜3%,等中心平面上的等剂量线位置平均偏差0.43 mm;30例患者PTV的V90差异＜2%,危及器官V30差异＜3%.结论 Neptune 3D-RTPS-A三维治疗计划系统具备临床应用的准确性和安全性.

Abstract：

Objective To investigate the safety and validity of Neptune 3D-RTPS-A treatment planning system compared to Prowess TPS.Methods A total of 30 clinical tumor cases with radiotherapy planning on Prowess TPS from September 2009 to May 2010 were used.The contours, organs at risk and target volumes in Prowess TPS were transported into Neptune TPS, the same parameters setted in the two treatment planning systems.The results of comparison of the two TPS were calculated.Results All cases of clinical treatment planning were completed successfully by Neptune TPS, and the various functions of the design were achieved for fitting tumor conformal radiation therapy.The key parameters on radiation treatment were compared.The results are as follows:the differences of source skin distance ( SSD ) ＜0.5% , differences of Monitor Unites ＜0.5%, the differences of dose at isocenter ＜2%, the differences of five isodose lines surrounding area ＜ 3%, and the mean difference of distances of five isodose lines was 0.43 mm, the differences of the volume of PTV on 90% isodose line ＜ 2%, and the differences in V30of organs at risk ＜ 3%.Conclusions Neptune TPS could be qualified for clinical validity and safety by clinical verification.     

125Ⅰ粒子源近距离治疗前列腺癌模型的剂量学研究

目的 研究放射性125Ⅰ粒子源在治疗前列腺癌中的剂量分布,探寻治疗计划系统(TPS)优化效果的有效方法.方法 选定1个治疗计划系统,应用热释光剂量计,基于前列腺癌等效模体,模拟测量前列腺癌中的剂量分布.模拟植入共89颗125Ⅰ粒子,每个粒子的活度为1.37×107Bq(±5%).结果 各层的最大剂量为151～241 Gy,与处方剂量145 Gy的偏差在4.1%～66.0%.各层的最小剂量在101～128 Gy,与处方剂量的偏差在12%～30%.离模体边缘10 mm处正常组织的最大剂量为46～91 Gy,偏差为44%～63%.结论 该系统对实际的粒子植入治疗,评估TPS提供了实用的方法.

Abstract：

Objective To study the dose distribution of the radioactive 125Ⅰ seeds sources in the treatment of prostate cancer and also to explore the more effective method for improving treatment planning system (TPS).Methods Choose the designated TPS and use TLDs dosimeter based on a prostate cancer model.Finally stimulated measurement was focused on dose distribution in prostate cancer.The number of 125Ⅰ seed sources implanted was 89, each with 1.37 × 107 ( ± 5% ) Bq.Results Maximum dose of every layer ranged from 151 to 241 Gy, by 4.1% to 66.0% higher than the prescribed dose (145 Gy).The Minimum dose of every layer ranged from 101 to 128 Gy, by 12% to 30% higher than the prescribed dose.The maximum dose of normal tissue at 10 mm from the edge of model ranged from 46 to 91 Gy.The deviation was 44% -63% compared with the prescribed dose.Conclusions The designated TPS shows that it could be used as a practical guide for treatment of prostate cancer with the radioactive 125Ⅰ seed sources.The research methods offered by the study can provide evaluation of the TPS.     

辐射对Jurkat细胞P21蛋白及ICR小鼠胸腺细胞p21基因表达的影响

目的 探讨电离辐射对Jurkat细胞P21蛋白和ICR小鼠胸腺细胞p21基因表达的影响.方法 采用流式细胞术(FCM),检测0、0.5、1.0、2.0、4.0及6.0 Gy X射线照射后Jurkat细胞中P21蛋白表达的变化.采用实时定量PCR技术,分别检测0、0.5、1.0、2.0、4.0及6.0 Gy X射线照射后4和24 hd'鼠胸腺及脾细胞中p21基因表达的变化.结果 不同剂量X射线照射后12和24 h,Jurkat细胞中P21蛋白表达在0.5～4.0 Gy范围内均随剂量的增大而升高(t=-24.23～-3.96,P<0.05),6 Gy时均出现表达下降(t=-11.19、-14.50,P<0.05);与假照射组相比,在0～6.0 Gy照射后4和24 h,小鼠胸腺及脾细胞中p21基因的相对表达量均随剂量增大逐渐增加(t=-29.96～8.80,P<0.05);并于6.0 Gy时达最高(t=-11.84～-3.42,P<0.05),仅胸腺细胞1 Gy照射后4 h除外(t=-3.42,P>0.05).结论 x射线能诱导P21蛋白及基因表达增加,并在一定剂量范围内存在良好的剂量-效应关系.

Abstract：

Objective To investigate the effects of ionizing radiation on the expression of P21 protein in Jurkat cell line and p21 gene in thymocytes and splenocytes of mice.Methods Flow cytometry (FCM)was used to analyze the expression of P21 protein in Jurkat cells at 12 and 24 h after irradiation to 0,0.5,1.0,2.0,4.0,and 6.0 Gy.Real-time PCR was used to detect the expression of p21 gene in thymocytes and splenocytes of mice at4 and 24 h after irradiation to 0,0.5,1.0,2.0,4.0,and 6.0 Gy.Multi-staining was used to analyze the micronucleus rates of Rct in bone marrow.Results The expressions of P21 protein were increased in a dose-dependent manner during 0.5-4.0 Gy(t=-24.23--3.96,P<0.05),but decreased at 6.0 Gy at 12 and 24 h post-irradiation(t=-11.19,-14.50,P<0.05).The expressions of p2 1 gene in both thymocytes and splenocytes of mice were increased in dose-dependent manner in the range of 0-6.0 Gy(including 6.0 Gy)(t=-29.96-8.80,P<0.05),and reached to the peak at 6.0 Gy at 4 and 24 h post-irradiation(t=-11.84--3.42,P<0.05),except thymocytes at 4 h and 1.0 Gy post-irradiation(t=-3.42,P>0.05).Conclusions The expressions of P21 protein and p21 gene could be increased by X-ray irradiation.which shows good dosedependent manners in certain range of dose.     

甘肃某矿区周围居民恶性肿瘤死亡调查

Objective To evaluate the cancer risk among the inhabitants around a certain nuclear facility of Gansu Province after operation for nearly 50 years.Methods Specially developed forms were filled by countryside doctors in the villages 30 km on the leeward or at the lower reaches of Yumen City,Gansu Province where a nuclear facility had operated for nearly 50 years,to register the relevant data of those who died of solid cancer and leukemia during the period from 1 January 2004 to 31 December 2008 based on the relevant data and household survey.A town 90 km away from the nuclear facility with 4181 people were regarded as control area.Results The crude mortality and standardized mortality rate(SMR) of cancer were 95.51×10-5 and 93.56×10-5.respectively.The crude mortality and SMR of leukemia were 2.44×10-05 and 2.22×10-05, respectively.and the crude mortality and SMR of cancer were 106.88×10-05, and 89.31×10-5, respectively.The crude mortality and SMR of leukemia were 2.44×10-05 and 2.22×10-5, respectively in the investigated area,and the crude mortality of leukemia was 3.56×10-5 (only one leukemia cage died)in the control area in the same time.The cancer and leukemia mortality rates of the investigated area were similar to those of control area.Conclusions Nuclear facility does not significantly increase the cancer mortality among the residents living nearby.     

氢氧化锂吸收剂用于清除闭式/半闭式潜水呼吸器二氧化碳的实验研究

目的 探讨氢氧化锂吸收剂清除闭式/半闭式潜水呼吸器二氧化碳(CO2)的适用性.方法 选择1种氧氧化锂吸收剂和2种经典的钠石灰吸收剂(钠石灰1、钠石灰2),采用人工肺与国产某闭式潜水呼吸器进行无人实验.定时记录吸收剂罐内的温度及吸收剂罐出EI端气体中CO2 浓度,当CO2 浓度超过1.5%时停止试验,并记录CO2浓度达到0.5%和1.5%的准确时间(T0.5、T1.5).比较填充量、温度、CO2:达到0.5%和1.5%的时间.结果 相同吸收剂罐,氢氧化锂吸收剂的填充质量最小,为1113.5 g,明显低于经典钠石灰吸收剂的填充质量(1845.0 g和1855.5 g),对于克服呼吸器的正浮力是不利的;使用氢氧化锂吸收剂时,吸收剂罐出口端气体中CO2的T0.5和T1.5分别为(86.00±1.63)min和(119.00±2.94)min,钠石灰1的T0.5和T15分别为(55.00±0.82)min和(62.00±1.63)min,钠石灰2的T0.5和T1.5分别为(57.00±2.45)min和(65.00±1.63)min,氢氧化锂吸收剂的使用时间显著长于经典钠石灰吸收剂(P＜0.05),吸收效率好;使用氢氧化锂吸收剂时,吸收剂罐内的温度最高达到191.5℃,是钠石灰1(74.8℃)的2.56倍,是钠石灰2(83.6℃)的2.29倍.结论 本研究采用的氢氧化锂吸收剂可能不适合用作闭式/半闭式潜水呼吸器的CO2吸收剂.

Abstract：

Objective To investigate the applicability of lithium hydroxide ( LiOH) absorbent in closed/semi-closed diving apparatus. Methods One LiOH absorbent and 2 classical sodium lime absorbents ( sodium lime 1 and sodium lime 2) were chosen to carry out unmanned experiments by using the manual lung and a closed breathing apparatus. Temperature in the canister and CO2 level at the outlet of the canister were timely monitored and recorded. When CO2 level in the inhaled gas exceeded 1.5%, the experiment was terminated, and the time when CO2 levels reached at 0. 5% and 1. 5% was recorded. The amounts of absorbents filled, temperatures and the time when CO2 levels reached at 0. 5% and 1.5% were recorded. Results The weight of the LiOH absorbent was minimal (1113. 5 g), which was obviously less than the classical absorbent, sodium lime 1 and sodium lime 2( 1845.0 g and 1855.5 g),which was a disadvantage to the positive buoyancy of the diving apparatus. With the LiOH absorbent, the time for CO2 to reach 0.5% (T0.5) and 1.5% (T1.5) was 86.00 ± 1. 63 min and 119. 00 ± 2. 94 min respectively. While for sodium lime 1, the time for T0.5 and T1.5 were 55. 00 ±0. 82min and 62. 00 ± 1. 63min and for sodium lime 2, the time for T0.5 and T1.5 were 57. 00 ± 2.45min and 65. 00 ± 1. 63min respectively. The T1.5 and T1.5 of the LiOH absorber were obviously longer than those of sodium lime 1 and sodium lime 2 (P＜0. 05). The maximum temperature in the LiOH canister was 191. 5℃,which was 2. 56 times greater than that of sodium lime 1 (74. 8℃) ,and 2. 29 times greater than that of sodium lime 2 (83. 6 ℃ ). Conclusions This kind of LiOH absorber might not be suitable to closed/semi-closed diving apparatus.     

Combination chemotherapy of gemcitabine and cisplatin by double way plus implantation of radioactive seed 125I in treating stage Ⅲ non-small cell lung cancer

Objective To assess the therapeutic effect of combination chemotherapy of gemcitabine and cisplatin by double way plus implantation of radioactive seed 125I implantation in treating stage Ⅲ non-small cell lung cancer. Methods Sixty cases with stage Ⅲ non-small cell lung cancer were randomly divided into two groups with random number table. In group A (in interventional treatment group, n = 30),the gemcitabine 1000 mg/m2 and one third of the cisplatin 100 mg/m2 was given using seldinger technique for transcatheter bronchial arterial infusion chemotherapy on day 1. Two-thirds of the cisplatin 100 mg/m2 was infused in veins on day 2 and 3. The gemcitabine 1000 mg/m2 was infused in veins on day 8, 21 days for a period. In group B (interventional - 125I groups), the method of combination chemotherapy of gemcitabine and cisplatin was the same as in Group A. After ten days of arterial perfusion, 125I seeds were implantated, 21 days for a period. All patients received at least 2 cycles. The imaging evaluation of patients after treatment standards included complete remission (CR), partial remission (PR), stable (SD),progressive disease (PD), effective rate (CR + PR)/30 and clinical benefit rate (CR + PR + SD)/30.Non-parametric rank sum test was used to compare short-term effect of the two groups treatment of two cycles.x2 test was used to compare year survival, Kaplan-Meier method was used to calculate median survival,log-rank test method was used to difference between the groups. Results In group A, there were 17 PR,9SD and 4 PD. The overall response rate was 56. 7% (17/30) and clinical beneficial rate was 86. 7% (26/30). In Group B, there were 2 CR, 21 PR, 7 SD. The overall response rate was 76.7% (23/30) and clinical beneficial rate was 100% (30/30). There was significant difference between the two groups (P =0. 036). In group A, the 1 year survival rate was 46. 7% (14/30) and the 2 year survival rate was 36. 7%(11/30), median survival time (MST) was 10 months . In group B, the 1 year survival rate was 76. 7%(23/30) and the 2 year survival rate was 63. 3% (19/30) , median survival time (MST) was 27 months.There was a significant difference between two group in 1 year survival rate (P = 0. 017), 2 year survival rate (P = 0. 039) and median survival time (P = 0. 006). Conclusion The treatment effects of Ⅲ stage non-small cell lung cancer by gemcitabine and cisplatin combination chemotherapy with double way plus radioactive seed 125I implantation was better than gemcitabine and cisplatin combination chemotherapy with double way.