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   2399869篇
  免费   199700篇
  国内免费   4301篇
耳鼻咽喉   34621篇
儿科学   74603篇
妇产科学   63528篇
基础医学   338566篇
口腔科学   68226篇
临床医学   217399篇
内科学   473943篇
皮肤病学   48645篇
神经病学   202252篇
特种医学   96588篇
外国民族医学   886篇
外科学   364373篇
综合类   57346篇
现状与发展   1篇
一般理论   991篇
预防医学   192146篇
眼科学   56684篇
药学   180432篇
  4篇
中国医学   4605篇
肿瘤学   128031篇
  2018年   25112篇
  2017年   19409篇
  2016年   21427篇
  2015年   24129篇
  2014年   34693篇
  2013年   52359篇
  2012年   70834篇
  2011年   74403篇
  2010年   43686篇
  2009年   41919篇
  2008年   70267篇
  2007年   74564篇
  2006年   75485篇
  2005年   73201篇
  2004年   70478篇
  2003年   68018篇
  2002年   67103篇
  2001年   113014篇
  2000年   117118篇
  1999年   98853篇
  1998年   28108篇
  1997年   25678篇
  1996年   25622篇
  1995年   24772篇
  1994年   23291篇
  1993年   21676篇
  1992年   79737篇
  1991年   76674篇
  1990年   73874篇
  1989年   71129篇
  1988年   66104篇
  1987年   65063篇
  1986年   61598篇
  1985年   58639篇
  1984年   44418篇
  1983年   37827篇
  1982年   22987篇
  1981年   20410篇
  1979年   41484篇
  1978年   29107篇
  1977年   24490篇
  1976年   22933篇
  1975年   24085篇
  1974年   29780篇
  1973年   28176篇
  1972年   26358篇
  1971年   24282篇
  1970年   22841篇
  1969年   21188篇
  1968年   19198篇
排序方式: 共有10000条查询结果,搜索用时 96 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.
Sorsby fundus dystrophy (SFD), an autosomal dominant, fully penetrant, degenerative disease of the macula, is manifested by symptoms of night blindness or sudden loss of visual acuity, usually in the third to fourth decades of life due to choroidal neovascularization (CNV). SFD is caused by specific mutations in the Tissue Inhibitor of Metalloproteinase-3, (TIMP3) gene. The predominant histo-pathological feature in the eyes of patients with SFD are confluent 20–30 m thick, amorphous deposits found between the basement membrane of the retinal pigment epithelium (RPE) and the inner collagenous layer of Bruch's membrane. SFD is a rare disease but it has generated significant interest because it closely resembles the exudative or “wet” form of the more common age-related macular degeneration (AMD). In addition, in both SFD and AMD donor eyes, sub-retinal deposits have been shown to accumulate TIMP3 protein. Understanding the molecular functions of wild-type and mutant TIMP3 will provide significant insights into the patho-physiology of SFD and perhaps AMD. This review summarizes the current knowledge on TIMP3 and how mutations in TIMP3 cause SFD to provide insights into how we can study this disease going forward. Findings from these studies could have potential therapeutic implications for both SFD and AMD.  相似文献   
46.
47.
48.
49.
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   
50.
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