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   2391470篇
  免费   200235篇
  国内免费   4224篇
耳鼻咽喉   34398篇
儿科学   73383篇
妇产科学   63521篇
基础医学   337577篇
口腔科学   67987篇
临床医学   218205篇
内科学   471752篇
皮肤病学   48238篇
神经病学   202523篇
特种医学   96704篇
外国民族医学   887篇
外科学   362909篇
综合类   56624篇
现状与发展   1篇
一般理论   1015篇
预防医学   193485篇
眼科学   56015篇
药学   178940篇
  4篇
中国医学   4390篇
肿瘤学   127371篇
  2018年   24615篇
  2016年   20924篇
  2015年   23635篇
  2014年   34025篇
  2013年   51591篇
  2012年   69826篇
  2011年   73329篇
  2010年   43109篇
  2009年   41413篇
  2008年   69669篇
  2007年   74096篇
  2006年   74987篇
  2005年   72983篇
  2004年   70287篇
  2003年   67884篇
  2002年   67065篇
  2001年   112984篇
  2000年   117068篇
  1999年   98805篇
  1998年   28111篇
  1997年   25753篇
  1996年   25654篇
  1995年   24759篇
  1994年   23357篇
  1993年   21712篇
  1992年   79735篇
  1991年   76716篇
  1990年   73900篇
  1989年   71158篇
  1988年   66157篇
  1987年   65096篇
  1986年   61600篇
  1985年   58722篇
  1984年   44530篇
  1983年   37881篇
  1982年   23044篇
  1981年   20497篇
  1980年   19179篇
  1979年   41541篇
  1978年   29180篇
  1977年   24479篇
  1976年   22983篇
  1975年   24103篇
  1974年   29801篇
  1973年   28210篇
  1972年   26378篇
  1971年   24299篇
  1970年   22879篇
  1969年   21222篇
  1968年   19232篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.

Objective

Comparative survival between neoadjuvant chemotherapy and adjuvant chemotherapy for patients with cT2-4N0-1M0 non–small cell lung cancer has not been extensively studied.

Methods

Patients with cT2-4N0-1M0 non–small cell lung cancer who received platinum-based chemotherapy were retrospectively identified. Exclusion criteria included stage IV disease, induction radiotherapy, and targeted therapy. The primary end point was disease-free survival. Secondary end points were overall survival, chemotherapy tolerance, and ability of Response Evaluation Criteria In Solid Tumors response to predict survival. Survival was estimated using the Kaplan–Meier method, compared using the log-rank test and Cox proportional hazards models, and stratified using matched pairs after propensity score matching.

Results

In total, 330 patients met the inclusion criteria (n = 92/group after propensity-score matching; median follow-up, 42 months). Five-year disease-free survival was 49% (95% confidence interval, 39-61) for neoadjuvant chemotherapy versus 48% (95% confidence interval, 38-61) for adjuvant chemotherapy (P = .70). On multivariable analysis, disease-free survival was not associated with neoadjuvant chemotherapy or adjuvant chemotherapy (hazard ratio, 1.1; 95% confidence interval, 0.64-1.90; P = .737), nor was overall survival (hazard ratio, 1.21; 95% confidence interval, 0.63-2.30; P = .572). The neoadjuvant chemotherapy group was more likely to receive full doses and cycles of chemotherapy (P = .014/0.005) and had fewer grade 3 or greater toxicities (P = .001). Response Evaluation Criteria In Solid Tumors response to neoadjuvant chemotherapy was associated with disease-free survival (P = .035); 15% of patients receiving neoadjuvant chemotherapy (14/92) had a major pathologic response.

Conclusions

Timing of chemotherapy, before or after surgery, is not associated with an improvement in overall or disease-free survival among patients with cT2-4N0-1M0 non–small cell lung cancer who undergo complete surgical resection.  相似文献   
42.
43.
44.
45.
46.
47.
48.
Acne vulgaris (acne) is a chronic inflammatory disease of the sebaceous gland, characterized by follicular hyperkeratinization, excessive colonization by Propionibacterium acnes (Pacnes) as well as immune reactions and inflammation. Despite an armamentarium of topical treatments available including benzoyl peroxide, retinoids and azelaic acid, topical antibiotics in monotherapies, especially erythromycin and clindamycin, are still used in Europe to treat acne. This intensive use led to antimicrobial‐resistant P. acnes and staphylococci strains becoming one of the main health issues worldwide. This is an update on the current topical acne treatments available in Europe, their mechanism of action, their potential to induce antimicrobial resistance and their clinical efficacy and safety.  相似文献   
49.
50.
Dosage form is a mean used for the delivery of drug to a living body. In order to get the desired effect the drug should be delivered to its site of action at such rate and concentration to achieve the maximum therapeutic effect and minimum adverse effect. Since oral route is still widely accepted route but having a common drawback of difficulty in swallowing of tablets and capsules. Therefore a lot of research has been done on novel drug delivery systems. This review is about oral dispersible tablets a novel approach in drug delivery systems that are now a day''s more focused in formulation world, and laid a new path that, helped the patients to build their compliance level with the therapy, also reduced the cost and ease the administration especially in case of pediatrics and geriatrics. Quick absorption, rapid onset of action and reduction in drug loss properties are the basic advantages of this dosage form.  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