首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   10673篇
  免费   986篇
  国内免费   294篇
耳鼻咽喉   74篇
儿科学   143篇
妇产科学   368篇
基础医学   949篇
口腔科学   704篇
临床医学   636篇
内科学   414篇
皮肤病学   210篇
神经病学   370篇
特种医学   378篇
外国民族医学   4篇
外科学   1055篇
综合类   1510篇
一般理论   1篇
预防医学   442篇
眼科学   159篇
药学   2616篇
  8篇
中国医学   1147篇
肿瘤学   765篇
  2024年   8篇
  2023年   153篇
  2022年   201篇
  2021年   308篇
  2020年   349篇
  2019年   280篇
  2018年   253篇
  2017年   358篇
  2016年   425篇
  2015年   424篇
  2014年   897篇
  2013年   825篇
  2012年   789篇
  2011年   815篇
  2010年   605篇
  2009年   557篇
  2008年   567篇
  2007年   600篇
  2006年   546篇
  2005年   412篇
  2004年   346篇
  2003年   283篇
  2002年   279篇
  2001年   230篇
  2000年   187篇
  1999年   175篇
  1998年   111篇
  1997年   116篇
  1996年   92篇
  1995年   83篇
  1994年   57篇
  1993年   77篇
  1992年   56篇
  1991年   53篇
  1990年   45篇
  1989年   39篇
  1988年   36篇
  1987年   30篇
  1986年   28篇
  1985年   44篇
  1984年   33篇
  1983年   23篇
  1982年   18篇
  1981年   18篇
  1980年   25篇
  1979年   17篇
  1978年   23篇
  1977年   14篇
  1976年   13篇
  1974年   11篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.

Background

Limited data exist on the clinical behavior of pediatric non-rhabdomyosarcoma soft tissue sarcomas (NRSTS) with distant metastases at onset, and a clear standard of care has not yet been defined.

Methods

This cohort study reports on pediatric adult-type metastatic NRSTS enrolled in two concurrent prospective European studies, i.e., the randomized BERNIE study and the single-arm MTS 2008 study developed by the European paediatric Soft tissue sarcoma Study Group. Treatment programs were originally designed for patients with metastatic rhabdomyosarcoma, i.e., nine courses of multidrug chemotherapy (with or without bevacizumab in the BERNIE study), followed by 12 cycles of maintenance therapy, whereas radiotherapy and/or surgery (on primary tumor and/or metastases) were delayed until after seven courses of chemotherapy had been administered.

Results

The study included 61 patients <21 years old treated from July 2008 to December 2016. The lung was the site of metastases in 75% of the cases. All patients received multi-agent chemotherapy, 44% had local therapy to primary tumor, and 18% had treatment of metastases. Median time to progression/relapse was 6 months. A high rate of tumor progression was observed during the initial part of the chemotherapy program. With a median follow-up of 41.5 months (range, 2–111 months), 3-year event-free survival and overall survival were 15.4% (95% confidence interval [CI], 7.6–25.7) and 34.9% (95% CI, 22.7–47.5), respectively. There were no statistically significant differences in outcome depending on the type of treatment administered.

Conclusions

The study confirmed the overall poor outcome for patients with metastatic NRSTS, whose treatment remains a challenge.

Plain Language Summary

  • Pediatric non-rhabdomyosarcoma soft tissue sarcomas form a heterogeneous group of rare tumors.
  • Although recent international studies have defined the standard of care for patients with localized disease, limited data are available on the clinical behavior of patients with distant metastases.
  • This study on 61 metastatic cases treated on two prospective European protocols confirms that the chances of survival of such patients are often dismal and a standard treatment is still lacking.
  相似文献   
3.
Perinatal factors have been associated with soft tissue sarcomas (STS) in case-control studies. However, (i) the contributions of factors including fetal growth remain unknown, ( ii ) these factors have not been examined in cohort studies and (iii) few assessments have evaluated risk in specific STS subtypes. We sought to identify the role of perinatal and familial factors on the risk of STS in a large population-based birth cohort. We identified 4,023,436 individuals in the Swedish Birth Registry born during 1973–2012. Subjects were linked to the Swedish Cancer Registry, where incident STS cases were identified. We evaluated perinatal and familial factors obtained from Statistics Sweden, including fetal growth, gestational age, and presence of a congenital malformation. Poisson regression was used to estimate incidence rate ratios (IRRs) and 95% confidence intervals (CIs) for associations between perinatal factors and STS overall, as well as by common subtypes. There were 673 individuals diagnosed with STS in 77.5 million person-years of follow-up. Having a congenital malformation was associated with STS (IRR = 1.70, 95% CI: 1.23–2.35). This association was stronger (IRR = 2.90, 95% CI: 1.25–6.71) in recent years (2000–2012). Low fetal growth was also associated with STS during the same time period (IRR = 1.86, 95% CI: 1.05–3.29). Being born preterm was associated with rhabdomyosarcoma (IRR = 1.74, 95% CI: 1.08–2.79). In our cohort study, those with congenital malformations and other adverse birth outcomes were more likely to develop a STS compared to their unaffected contemporaries. These associations may point to disrupted developmental pathways and genetic factors influencing the risk of STS.  相似文献   
4.
乌灵胶囊治疗焦虑性失眠症临床研究   总被引:1,自引:0,他引:1  
目的:观察乌灵胶囊对焦虑性失眠症患者的心理及睡眠质量的改善效果,为临床治疗焦虑性失眠症提供参考。方法:选择159例焦虑性失眠症患者为研究对象。按照随机数字表法分为对照组79例与观察组80例。对照组给予盐酸帕罗西汀片治疗,观察组给予乌灵胶囊治疗。治疗1个月后,比较分析2组患者睡眠质量、汉密尔顿焦虑量表评分(HAMA)及不良反应发生情况。结果:观察组总有效率为91.25%,明显高于对照组的78.48%(P<0.05)。治疗前,2组患者HAMA评分比较,差异无统计学意义(P>0.05);治疗1、2个月后,观察组HAMA评分明显低于对照组,差异有统计学意义(P<0.05)。观察组总不良反应发生率为6.25%,明显低于对照组的18.99%(P<0.05)。结论:乌灵胶囊治疗焦虑性失眠症能明显改善患者的睡眠质量以及心理状况,值得推广应用。  相似文献   
5.
《中国现代医生》2020,58(36):103-106+110
目的 对复方倍他米松注射液联合泛昔洛韦胶囊、普瑞巴林胶囊治疗带状疱疹的临床疗效进行观察并探讨。方法 选取2018 年1 月~2019 年12 月我院收治的118 例带状疱疹患者为研究对象,采用随机抽签的方式将患者分为对照组(泛昔洛韦胶囊+普瑞巴林胶囊+甲钴胺片+维生素B1 片)与观察组(联合复方倍他米松注射液),比较两组治疗总有效率、VAS 评分、QS 评分、C 反应蛋白、无新发皮疹时间、结痂时间及疼痛停止时间、随访2 个月后带状疱疹后遗神经痛发生率以及不良反应发生率。结果 观察组与对照组治疗总有效率分别为94.92%及76.27%,组间对比差异有统计学意义(P<0.05);治疗后,观察组VAS 评分显著低于对照组;观察组QS 评分低于对照组(P<0.05);治疗后,观察组C 反应蛋白显著低于对照组(P<0.05);观察组无新发皮疹时间、结痂时间及疼痛停止时间分别显著短于对照组(P<0.05);随访2 个月后,发现观察组带状疱疹后遗神经痛发生率显著低于对照组(P<0.05);观察组不良反应发生与对照组比较,差异无统计学意义(P>0.05)。结论 复方倍他米松注射液联合泛昔洛韦胶囊、普瑞巴林胶囊治疗带状疱疹不仅效果好且安全性高,值得使用。  相似文献   
6.
单慧勇  郭春锋  袁亚楠 《新中医》2020,52(3):134-136
目的:探究针灸配合松龄血脉康胶囊治疗急性脑梗死(ACI)的疗效及对脂联素(APN)、内皮素-1 (ET-1)水平的影响。方法:将62例ACI患者作为研究对象,按随机数字表法分成2组,每组各31例。对照组采用松龄血脉康胶囊治疗,观察组为针灸配合松龄血脉康胶囊治疗;观察2组临床疗效,并比较APN、ET-1、超敏C-反应蛋白(hs-CRP)及纤维蛋白原(FIB)。结果:观察组总有效率高达90.23%,显著高于对照组的64.52%,2组比较,差异有统计学意义(χ^2=5.905,P<0.05)。经治疗,2组治疗后APN显著升高(P<0.05),ET-1、hs-CRP、FIB均下降(P<0.05)。治疗后组间比较,观察组患者APN高于对照组(P<0.05),ET-1、hs-CRP、FIB均低于对照组(P<0.05)。结论:对ACI患者行针灸配合松龄血脉康胶囊治疗,能够显著增加APN水平,降低ET-1水平,且其炎性反应、凝血功能改善效果更为显著。  相似文献   
7.
8.
Nivolumab is a human monoclonal antibody against the immune checkpoint receptor programmed death‐1, inhibiting binding to programmed death‐ligand 1 or 2 (PD‐L1 or PD‐L2). This phase 2 study evaluated the efficacy and safety of nivolumab in patients with advanced/recurrent uterine cervical cancer, uterine corpus cancer, or soft tissue sarcoma (STS). Patients received nivolumab 240 mg at 2‐week intervals. Primary endpoint was objective response rate; secondary endpoints included overall survival, progression‐free survival, and safety. PD‐L1 expression and microsatellite‐instability (MSI) status were analyzed as potential efficacy biomarkers. Objective response rate was 25%, 23%, and 0% in patients with cervical cancer (n = 20), corpus cancer (n = 22), and STS (n = 21), respectively. The lower 80% confidence intervals of objective response rates in patients with cervical or corpus cancer exceeded the threshold rate (5%); the primary endpoint was met in cervical and corpus cancer, but not in STS. Median progression‐free survival was 5.6, 3.4, and 1.4 months, and 6‐month overall survival was 84%, 73%, and 86% in cervical cancer, corpus cancer, and STS, respectively. The objective response rate was higher in patients with cervical cancer with PD‐L1‐positive (n = 5/15; 33%) versus PD‐L1‐negative (n = 0/5; 0%) tumors. The two patients with corpus cancer classified as MSI‐high responded; the six patients classified as microsatellite stable did not respond. Overall, nivolumab showed acceptable toxicity in all cohorts, with evidence of clinical activity in uterine cervical or corpus cancer, but not in STS. PD‐L1 expression in cervical cancer and MSI‐high in corpus cancer may predict clinical activity of nivolumab in these cancers.  相似文献   
9.
越鞠丸联合盐酸氟西汀胶囊治疗抑郁症临床研究   总被引:3,自引:0,他引:3  
兰建萍  蒋晁明  郑顺 《新中医》2020,52(3):29-31
目的:观察越鞠丸联合盐酸氟西汀胶囊治疗抑郁症的临床效果及对血清脑源性神经营养因子(BDNF)水平的影响。方法:纳入因抑郁症就诊的64例患者,随机分为对照组与治疗组各32例。对照组给予盐酸氟西汀胶囊抗5-羟色胺(5-HT)治疗,治疗组在对照组基础上联合越鞠丸治疗。比较2组治疗前后汉密尔顿抑郁量表(HAMD-24)评分、抑郁症状学快速自评量表(QIDS-SR16)、血清BDNF水平及总体疗效。结果:治疗前后比较,2组HAMD-24评分、QIDS-SR16评分均下降,血清BDNF水平升高(P<0.05),组间比较,治疗组2项评分下降更多,血清BDNF水平升高更多(P<0.05)。治疗后,治疗组总体疗效为90.63%,优于对照组的68.75%,差异有统计学意义(P<0.05)。结论:越鞠丸联合盐酸氟西汀胶囊治疗抑郁症,可更加有效减缓患者抑郁症状,升高血清BDNF水平,增加临床疗效,有效保护患者脑功能,值得临床推广。  相似文献   
10.
Abstract

A retrospective cohort study was performed to examine whether, in artificial endometrial preparation for frozen embryo transfer (FET) cycles, progesterone (P) levels the day prior to embryo transfer of euploid embryos have an impact on pregnancy outcomes. In a private university clinic, 244 FETs between January 2016 and June 2017 were analyzed. Endometrial preparation was achieved with estradiol valerate and vaginal micronized progesterone. Serum P and estradiol levels the day prior to embryo transfer were measured. A multivariable analysis to assess the relationship between serum P level and pregnancy outcomes was performed, adjusted for confounding variables. Mean P value was 11.3?±?5.1?ng/ml. Progesterone levels were split in quartiles: Q1: ≤ 8.06?ng/ml; Q2: 8.07–10.64?ng/ml; Q3: 10.65–13.13?ng/ml; Q4: > 13.13?ng/ml. Patients included in the lower P quartile had a significantly higher miscarriage rate and significantly lower live birth rate (LBR) compared to the higher ones. A low serum P level (≤ 10.64?ng/ml) one day before FET is associated with a lower pregnancy and LBR following FET of euploid embryos.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号