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   4330篇
  免费   417篇
  国内免费   9篇
耳鼻咽喉   36篇
儿科学   130篇
妇产科学   107篇
基础医学   536篇
口腔科学   114篇
临床医学   491篇
内科学   992篇
皮肤病学   30篇
神经病学   336篇
特种医学   172篇
外科学   383篇
综合类   194篇
一般理论   8篇
预防医学   505篇
眼科学   38篇
药学   356篇
中国医学   12篇
肿瘤学   316篇
  2021年   78篇
  2020年   49篇
  2019年   68篇
  2018年   78篇
  2017年   47篇
  2016年   53篇
  2015年   70篇
  2014年   94篇
  2013年   155篇
  2012年   191篇
  2011年   228篇
  2010年   112篇
  2009年   109篇
  2008年   179篇
  2007年   210篇
  2006年   208篇
  2005年   214篇
  2004年   198篇
  2003年   173篇
  2002年   204篇
  2001年   150篇
  2000年   145篇
  1999年   130篇
  1998年   67篇
  1997年   61篇
  1996年   53篇
  1995年   53篇
  1994年   40篇
  1993年   29篇
  1992年   70篇
  1991年   98篇
  1990年   56篇
  1989年   89篇
  1988年   92篇
  1987年   101篇
  1986年   68篇
  1985年   72篇
  1984年   56篇
  1983年   35篇
  1982年   34篇
  1979年   42篇
  1977年   25篇
  1976年   25篇
  1975年   27篇
  1974年   29篇
  1973年   41篇
  1972年   30篇
  1971年   31篇
  1970年   27篇
  1969年   27篇
排序方式: 共有4756条查询结果,搜索用时 46 毫秒
1.
2.

Background

Treatment of advanced anal squamous cell cancer (SCC) is usually with the combination of cisplatin and 5-fluorouracil, which is associated with heterogeneous responses across patients and significant toxicity. We examined the safety and efficacy of a modified schedule, FOLFCIS (leucovorin, fluorouracil, and cisplatin), and performed an integrated clinical and genomic analysis of anal SCC.

Patients and Methods

We reviewed all patients with advanced anal SCC receiving first-line FOLFCIS chemotherapy – essentially a FOLFOX (leucovorin, fluorouracil, and oxaliplatin) schedule with cisplatin substituted for oxaliplatin – in our institution between 2007 and 2017, and performed deep sequencing to identify genomic markers of response and key genomic drivers.

Results

Fifty-three patients with advanced anal SCC (48 metastatic; 5 unresectable, locally advanced) received first-line FOLFCIS during this period; all were platinum-naive. The response rate was 48% (95% confidence interval [CI], 32.6%-63%). With a median follow-up of 41.6 months, progression-free survival and overall survival were 7.1 months (95% CI, 4.4-8.6 months) and 22.1 months (95% CI, 16.9-28.1 months), respectively. Among all patients with advanced anal SCC that underwent sequencing during the study period, the most frequent genomic alterations consisted of chromosome 3q amplification (51%) and mutations in PIK3CA (29%) and KMT2D (22%). No genomic alteration correlated with response to platinum-containing treatment. Although there were few cases, patients with human papillomavirus-negative anal SCC did not appear to benefit from FOLFCIS, and all harbored distinct genomic profiles with TP53, TERT promoter, and CDKN2A mutations.

Conclusions

FOLFCIS appears effective and safe as first-line chemotherapy in patients with advanced anal SCC and represents an alternative treatment option for these patients.  相似文献   
3.
BACKGROUND: Impaired neuropsychological test performance, especially on tests of executive function and attention, is often seen in children diagnosed with autism spectrum disorders (ASD). Structures involved in fronto-striatal circuitry, such as the caudate nucleus, may support these cognitive abilities. However, few studies have examined caudate volumes specifically in children with ASD, or correlated caudate volumes to cognitive ability. METHODS: Neuropsychological test scores and caudate volumes of children with ASD were compared to those of children with bipolar disorder (BD) and of typically developing (TD) children. The relationship between test performance and caudate volumes was analyzed. RESULTS: The ASD group displayed larger right and left caudate volumes, and modest executive deficits, compared to TD controls. While caudate volume inversely predicted performance on the Wisconsin Card Sorting Test in all participants, it differentially predicted performance on measures of attention across the ASD, BD and TD groups. CONCLUSIONS: Larger caudate volumes were related to impaired problem solving. On a test of attention, larger left caudate volumes predicted increased impulsivity and more omission errors in the ASD group as compared to the TD group, however smaller volume predicted poorer discriminant responding as compared to the BD group.  相似文献   
4.
5.
6.
7.
8.

Background  

To determine patterns of childhood lead exposure in a community living near a lead and zinc smelter in North Lake Macquarie, Australia between 1991 and 2002.  相似文献   
9.
10.
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