个体身份与生命意义：肺癌网络社区的疾病叙事

文章通过对国内"医享网"癌症社区"肺癌圈"中33篇精华帖的叙事分析,探究其中生命故事的主体对自我身份的建构路径及其对生命价值的意义探寻,并尝试性地提出一些反思。研究发现,在自述和他述生命故事中,叙事者在信息寻求过程中改善自我印象,并运用"写作疗法""阅读疗法"和叙事隐喻理解疾病,帮助患者重塑自身角色。通过社群互动,患者形塑了对自身的身份认同,并形成了集体层面的生命价值观。从本研究的结论看,疾病叙事是癌症网络社区患者建构个体身份、形成身份认同的重要途径,叙事或可成为未来增进社会对癌症乃至其他疾病的理解、推进治疗与康复的可行之路。     

肺癌患者血清同型半胱氨酸变化的临床意义

目的：探讨血清同型半胱氨酸在肺癌患者中的变化及临床意义。方法检测82例住院治疗肺癌患者和79例健康体检者空腹血清同型半胱氨酸水平。结果分析得出肺癌组的血清Hcy含量显著高于健康对照组，差异有统计学意义（P＜0.01）。Ⅰ～Ⅳ期肺癌的患者血清Hcy含量均显著高于健康组（P＜0.01）。结论血清Hcy可做为肺癌的病情诊断、疗效预后的辅助指标。     

Prediction of tumour pathological subtype from genomic profile using sparse logistic regression with random effects

The purpose of this study is to highlight the application of sparse logistic regression models in dealing with prediction of tumour pathological subtypes based on lung cancer patients'' genomic information. We consider sparse logistic regression models to deal with the high dimensionality and correlation between genomic regions. In a hierarchical likelihood (HL) method, it is assumed that the random effects follow a normal distribution and its variance is assumed to follow a gamma distribution. This formulation considers ridge and lasso penalties as special cases. We extend the HL penalty to include a ridge penalty (called ‘HLnet’) in a similar principle of the elastic net penalty, which is constructed from lasso penalty. The results indicate that the HL penalty creates more sparse estimates than lasso penalty with comparable prediction performance, while HLnet and elastic net penalties have the best prediction performance in real data. We illustrate the methods in a lung cancer study.     

Dual‐Donor Organ Exchange

Owing to the worldwide shortage of deceased‐donor organs for transplantation, living donations have become a significant source of transplant organs. However, not all willing donors can donate to their intended recipients because of medical incompatibilities. These incompatibilities can be overcome by an exchange of donors between patients. For kidneys, such exchanges have become widespread in the last decade with the introduction of optimization and market design techniques to kidney exchange. A small but growing number of liver exchanges have also been conducted. Over the last two decades, a number of transplantation procedures emerged where organs from two living donors are transplanted to a single patient. Prominent examples include dual‐graft liver transplantation, lobar lung transplantation, and simultaneous liver‐kidney transplantation. Exchange, however, has been neither practiced nor introduced in this context. We introduce dual‐donor organ exchange as a novel transplantation modality, and through simulations show that living‐donor transplants can be significantly increased through such exchanges. We also provide a simple theoretical model for dual‐donor organ exchange and introduce optimal exchange mechanisms under various logistical constraints.     

Comparative Potency Method for Cancer Risk Assessment: Application to Diesel Particulate Emissions1

An estimation of the human lung cancer “unit risk” from diesel engine particulate emissions has been made using a comparative potency approach. This approach involves evaluating the tumorigenic and mutagenic potencies of the particulates from four diesel and one gasoline engine in relation to other combustion and pyrolysis products (coke oven, roofing tar, and cigarette smoke) that cause lung cancer in humans. The unit cancer risk is predicated on the linear nonthreshold extrapolation model and is the individual lifetime excess lung cancer risk from continuous exposure to 1 μg carcinogen per m³ inhaled air. The human lung cancer unit risks obtained from the epidemiologic data for coke oven workers, roofing tar applicators, and cigarette smokers were, respectively, 9.3 × 10^?4, 3.6 × 10^?4, and 2.2 × 10^?6 per μg particulate organics per m³ air. The comparative potencies of these three materials and the diesel and gasoline engine exhaust particulates (as organic extracts) were evaluated by in vivo tumorigenicity bioassays involving skin initiation and skin carcinogenicity in SENCAR mice and by the in vitro bioassays that proved suitable for this analysis: Ames Salmonella microsome bioassay, L5178Y mouse lymphoma cell mutagenesis bioassay, and sister chromatid exchange bioassay in Chinese hamster ovary cells. The relative potencies of the coke oven, roofing tar, and cigarette smoke emissions, as determined by the mouse skin initiation assay, were within a factor of 2 of those determined using the epidemiologic data. The relative potencies, from the in vitro bioassays as compared to the human data, were similar for coke oven and roofing tar, but for the cigarette smoke condensate the in vitro tests predicted a higher relative potency. The mouse skin initiation bioassay was used to determine the unit lung cancer risk for the most potent of the diesel emissions. Based on comparisons with coke oven, roofing tar, and cigarette smoke, the unit cancer risk averaged 4.4 × 10^?4. The unit lung cancer risks for the other, less potent motor-vehicle emissions were determined from their comparative potencies relative to the most potent diesel using three in vitro bioassays. There was a high correlation between the in vitro and in vivo bioassays in their responses to the engine exhaust particulate extracts. The unit lung cancer risk per μg particulates per m³ for the automotive diesel and gasoline exhaust particulates ranged from 0.20 × 10^?4 to 0.60 × 10^?4; that for the heavy-duty diesel engine was 0.02 × 10^?4. These unit risks provide the basis for a future assessment of human lung cancer risks when combined with human population exposure to automotive emissions.     

Diesel Engine Exhaust and Lung Cancer Mortality: Time‐Related Factors in Exposure and Risk

To develop a quantitative exposure‐response relationship between concentrations and durations of inhaled diesel engine exhaust (DEE) and increases in lung cancer risks, we examined the role of temporal factors in modifying the estimated effects of exposure to DEE on lung cancer mortality and characterized risk by mine type in the Diesel Exhaust in Miners Study (DEMS) cohort, which followed 12,315 workers through December 1997. We analyzed the data using parametric functions based on concepts of multistage carcinogenesis to directly estimate the hazard functions associated with estimated exposure to a surrogate marker of DEE, respirable elemental carbon (REC). The REC‐associated risk of lung cancer mortality in DEMS is driven by increased risk in only one of four mine types (limestone), with statistically significant heterogeneity by mine type and no significant exposure‐response relationship after removal of the limestone mine workers. Temporal factors, such as duration of exposure, play an important role in determining the risk of lung cancer mortality following exposure to REC, and the relative risk declines after exposure to REC stops. There is evidence of effect modification of risk by attained age. The modifying impact of temporal factors and effect modification by age should be addressed in any quantitative risk assessment (QRA) of DEE. Until there is a better understanding of why the risk appears to be confined to a single mine type, data from DEMS cannot reliably be used for QRA.     

Reanalysis of the DEMS Nested Case‐Control Study of Lung Cancer and Diesel Exhaust: Suitability for Quantitative Risk Assessment

The International Agency for Research on Cancer (IARC) in 2012 upgraded its hazard characterization of diesel engine exhaust (DEE) to “carcinogenic to humans.” The Diesel Exhaust in Miners Study (DEMS) cohort and nested case‐control studies of lung cancer mortality in eight U.S. nonmetal mines were influential in IARC's determination. We conducted a reanalysis of the DEMS case‐control data to evaluate its suitability for quantitative risk assessment (QRA). Our reanalysis used conditional logistic regression and adjusted for cigarette smoking in a manner similar to the original DEMS analysis. However, we included additional estimates of DEE exposure and adjustment for radon exposure. In addition to applying three DEE exposure estimates developed by DEMS, we applied six alternative estimates. Without adjusting for radon, our results were similar to those in the original DEMS analysis: all but one of the nine DEE exposure estimates showed evidence of an association between DEE exposure and lung cancer mortality, with trend slopes differing only by about a factor of two. When exposure to radon was adjusted, the evidence for a DEE effect was greatly diminished, but was still present in some analyses that utilized the three original DEMS DEE exposure estimates. A DEE effect was not observed when the six alternative DEE exposure estimates were utilized and radon was adjusted. No consistent evidence of a DEE effect was found among miners who worked only underground. This article highlights some issues that should be addressed in any use of the DEMS data in developing a QRA for DEE.     

TP与GP化疗方案对肺癌患者骨髓抑制影响的Meta分析

目的通过Meta分析对紫杉醇+顺铂(TP)与吉西他滨+顺铂(GP)化疗方案对肺癌抗肿瘤药物治疗患者骨髓抑制的影响进行系统分析,探讨TP和GP的骨髓抑制差别。方法通过荟萃分析对TP与GP的骨髓抑制研究进行同质性检验和合并效应量的估计。结果同质性检验:χ2=91.84,自由度为29,P0.00001;合并效应量的估计:OR合并=1.36,OR合并95%可信限为0.90~2.04。OR合并的检验Z=1.482.41,P=0.14。结论 TP与GP化疗时对患者的骨髓抑制不良反应情况没有本质区别。     

TKI治疗老年晚期非小细胞肺癌的临床研究

目的进行吉非替尼治疗老年晚期非小细胞肺癌的疗效和毒性反应的临床研究。方法 102例晚期非小细胞肺癌,其中52例给予吉非替尼150mg口服,每日1次,每28天重复。50例予单药吉西他滨1000mg/m2,d1,d8,d15,每28天重复。结果吉非替尼组CR、PR、SD、有效率、疾病控制率、1年生存率分别为3.85%,21.15%,38.46%,38.46%,25.00%,64.50%和28.85%。吉西他滨组CR、PR、SD、有效率、疾病控制率、1年生存率分别为0,24%,32%,24%,56%和26%。两者之间无统计学差异。吉非替尼治疗常见的毒副作用为皮疹和腹泻,总的皮疹发生率为46.15%,腹泻发生率为26.9%,未见间质性肺病和常见的血液学毒性出现。而吉西他滨组的不良反应主要为骨髓抑制和消化道反应。在血液学毒性方面吉西他滨明显高于吉非替尼组,具有统计学差异(P0.05)。结论吉非替尼和吉西他滨单药治疗老年非小细胞肺癌疗效确切并相当。吉非替尼不仅延长了患者的生存,而且不良反应较轻,值得在临床老年非小细胞肺癌中应用。     

癌症如何被呈现？——基于优酷网肺癌视频的内容分析

网络视频已成为重要的内容传播方式,但现有研究少有关注其对疾病的呈现方式与呈现特征。通过确定入选标准和内容编码,对优酷网跨度10年的220个肺癌视频进行分析。研究表明,视频普遍存在信息不权威、不科学与不充分现象。自媒体和非专业的个体是视频发布主体,科学的筛查建议、社会支持、患者实际生存状态等内容极少出现,不同发布来源在健康信念模式要素呈现上存在显著差异。为此,建议加强对媒介平台的融合使用,强化信息呈现形态与内容设计,加强网络平台的内容审核等。