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   13312篇
  免费   928篇
  国内免费   107篇
耳鼻咽喉   121篇
儿科学   299篇
妇产科学   447篇
基础医学   1841篇
口腔科学   445篇
临床医学   1176篇
内科学   2901篇
皮肤病学   231篇
神经病学   1123篇
特种医学   498篇
外国民族医学   3篇
外科学   2072篇
综合类   246篇
一般理论   6篇
预防医学   703篇
眼科学   162篇
药学   716篇
  1篇
中国医学   56篇
肿瘤学   1300篇
  2023年   85篇
  2022年   58篇
  2021年   366篇
  2020年   217篇
  2019年   311篇
  2018年   386篇
  2017年   261篇
  2016年   330篇
  2015年   377篇
  2014年   486篇
  2013年   608篇
  2012年   989篇
  2011年   963篇
  2010年   521篇
  2009年   461篇
  2008年   790篇
  2007年   821篇
  2006年   702篇
  2005年   711篇
  2004年   676篇
  2003年   597篇
  2002年   587篇
  2001年   371篇
  2000年   356篇
  1999年   351篇
  1998年   104篇
  1997年   106篇
  1996年   71篇
  1995年   69篇
  1994年   81篇
  1993年   65篇
  1992年   171篇
  1991年   165篇
  1990年   125篇
  1989年   149篇
  1988年   82篇
  1987年   122篇
  1986年   86篇
  1985年   59篇
  1984年   67篇
  1983年   44篇
  1982年   26篇
  1981年   31篇
  1980年   29篇
  1979年   48篇
  1978年   22篇
  1976年   32篇
  1975年   23篇
  1974年   29篇
  1972年   25篇
排序方式: 共有10000条查询结果,搜索用时 187 毫秒
1.
2.
3.

Background

In colorectal cancer liver metastases (CRCLM), bevacizumab-based neoadjuvant strategies provide increased pathologic response. We aimed at assessing the activity of perioperative capecitabine, oxaliplatin, irinotecan, and bevacizumab (COI-B regimen) in patients with potentially resectable CRCLM, and investigating biomarkers for early prediction of pathologic response.

Patients and Methods

This was a single-center phase II study enrolling patients with liver-limited, borderline resectable disease and/or high-risk features. Patients received 5 preoperative and 4 postoperative cycles of biweekly COI-B (irinotecan 180 mg/m2 and bevacizumab 5 mg/Kg on day 1, oxaliplatin 85 mg/m2 on day 2, and capecitabine 1000 mg/m2 twice a day on days 2 to 6). The primary endpoint was pathologic response rate in the intention-to-treat population. A Simon 2-stage design was adopted to detect an increase from 30% to 50% with a power of 90%. Dynamic imaging biomarkers (early tumor shrinkage [ETS], deepness of response, maximum standardized uptake volume [SUVmax]/regression index) and next generation sequencing data were explored as surrogates.

Results

From June 2013 to March 2017, 46 patients were enrolled. Pathologic response was achieved in 63% patients (endpoint met), and responders achieved significantly better survival outcomes with respect to non-responders. The most frequent grade 3/4 adverse events were diarrhea and neutropenia (8.7%) in the preoperative phase and thromboembolic events (5.9%) in the postoperative phase. ETS and lower SUV-2 were significantly associated with pathologic response.

Conclusion

The COI-B regimen is a feasible and highly active perioperative strategy in patients with molecularly unselected, potentially resectable CRCLM. ETS and SUV-2 have a promising role as imaging-based biomarkers for pathologic response.  相似文献   
4.
5.
6.
7.
8.
BackgroundThe American Radium Society (ARS) Appropriate Use Criteria brain malignancies panel systematically reviewed (PRISMA [Preferred Reporting Items for Systematic Reviews and Meta-Analyses]) published literature on neurocognitive outcomes after stereotactic radiosurgery (SRS) for patients with multiple brain metastases (BM) to generate consensus guidelines.MethodsThe panel developed 4 key questions (KQs) to guide systematic review. From 11 614 original articles, 12 were selected. The panel developed model cases addressing KQs and potentially controversial scenarios not addressed in the systematic review (which might inform future ARS projects). Based upon quality of evidence, the panel confidentially voted on treatment options using a 9-point scale of appropriateness.ResultsThe panel agreed that SRS alone is usually appropriate for those with good performance status and 2–10 asymptomatic BM, and usually not appropriate for >20 BM. For 11–15 and 16–20 BM there was (between 2 case variants) agreement that SRS alone may be appropriate or disagreement on the appropriateness of SRS alone. There was no scenario (among 6 case variants) in which conventional whole-brain radiotherapy (WBRT) was considered usually appropriate by most panelists. There were several areas of disagreement, including: hippocampal sparing WBRT for 2–4 asymptomatic BM; WBRT for resected BM amenable to SRS; fractionated versus single-fraction SRS for resected BM, larger targets, and/or brainstem metastases; optimal treatment (WBRT, hippocampal sparing WBRT, SRS alone to all or select lesions) for patients with progressive extracranial disease, poor performance status, and no systemic options.ConclusionsFor patients with 2–10 BM, SRS alone is an appropriate treatment option for well-selected patients with good performance status. Future study is needed for those scenarios in which there was disagreement among panelists.  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