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   2644313篇
  免费   213690篇
  国内免费   6158篇
耳鼻咽喉   38269篇
儿科学   78686篇
妇产科学   70156篇
基础医学   371726篇
口腔科学   76898篇
临床医学   237241篇
内科学   523110篇
皮肤病学   54004篇
神经病学   220116篇
特种医学   105527篇
外国民族医学   940篇
外科学   404633篇
综合类   63359篇
现状与发展   2篇
一般理论   1028篇
预防医学   203054篇
眼科学   62592篇
药学   200867篇
  5篇
中国医学   5971篇
肿瘤学   145977篇
  2018年   27225篇
  2017年   20968篇
  2016年   22981篇
  2015年   26045篇
  2014年   37398篇
  2013年   56035篇
  2012年   75758篇
  2011年   79508篇
  2010年   46769篇
  2009年   45002篇
  2008年   75323篇
  2007年   80380篇
  2006年   81045篇
  2005年   78598篇
  2004年   75543篇
  2003年   73014篇
  2002年   72040篇
  2001年   130887篇
  2000年   135748篇
  1999年   114313篇
  1998年   31500篇
  1997年   28467篇
  1996年   28012篇
  1995年   26953篇
  1994年   25248篇
  1993年   23517篇
  1992年   90933篇
  1991年   87156篇
  1990年   83967篇
  1989年   81353篇
  1988年   75203篇
  1987年   73839篇
  1986年   69692篇
  1985年   66263篇
  1984年   49485篇
  1983年   41982篇
  1982年   24878篇
  1981年   21984篇
  1979年   45576篇
  1978年   31611篇
  1977年   26774篇
  1976年   24594篇
  1975年   26064篇
  1974年   32123篇
  1973年   30358篇
  1972年   28591篇
  1971年   26474篇
  1970年   24847篇
  1969年   23222篇
  1968年   21032篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.

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   
43.
44.
45.
46.
47.
We report a Chinese family with members affected by epidermolytic ichthyosis (EI), caused by KRT gene mutations. The proband was a 14‐year‐old boy who had simultaneous appearance of nephroblastoma and epidermolytic ichthyosis (EI). Both the patient and his mother exhibited the specific clinical and pathological manifestations of EI. We analysed all exons and flanking sequences of the KRT1 and KRT10 genes using PCR, and found that the proband and his mother had a G>C transition at nucleotide position 1432 in exon 7 of KRT1, resulting in an amino acid substitution of glutamate (GAA) to glutamine (CAA) at codon 478 (E478Q). The KRT10 gene had no mutations.  相似文献   
48.
49.
50.
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   
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