全文获取类型
收费全文 | 1639891篇 |
免费 | 136410篇 |
国内免费 | 2711篇 |
专业分类
耳鼻咽喉 | 22275篇 |
儿科学 | 53864篇 |
妇产科学 | 46914篇 |
基础医学 | 232702篇 |
口腔科学 | 47876篇 |
临床医学 | 145507篇 |
内科学 | 322385篇 |
皮肤病学 | 34705篇 |
神经病学 | 133655篇 |
特种医学 | 66379篇 |
外国民族医学 | 476篇 |
外科学 | 250447篇 |
综合类 | 40394篇 |
现状与发展 | 4篇 |
一般理论 | 575篇 |
预防医学 | 126196篇 |
眼科学 | 37342篇 |
药学 | 124304篇 |
4篇 | |
中国医学 | 3045篇 |
肿瘤学 | 89963篇 |
出版年
2018年 | 15964篇 |
2016年 | 13786篇 |
2015年 | 16085篇 |
2014年 | 22202篇 |
2013年 | 33359篇 |
2012年 | 45562篇 |
2011年 | 47998篇 |
2010年 | 28100篇 |
2009年 | 26813篇 |
2008年 | 45628篇 |
2007年 | 48087篇 |
2006年 | 48799篇 |
2005年 | 47258篇 |
2004年 | 46406篇 |
2003年 | 44523篇 |
2002年 | 43371篇 |
2001年 | 76047篇 |
2000年 | 78579篇 |
1999年 | 66748篇 |
1998年 | 18154篇 |
1997年 | 16631篇 |
1996年 | 16589篇 |
1995年 | 16270篇 |
1994年 | 15288篇 |
1993年 | 14404篇 |
1992年 | 55599篇 |
1991年 | 53933篇 |
1990年 | 52724篇 |
1989年 | 51002篇 |
1988年 | 47366篇 |
1987年 | 46710篇 |
1986年 | 44416篇 |
1985年 | 42999篇 |
1984年 | 32193篇 |
1983年 | 27710篇 |
1982年 | 16309篇 |
1981年 | 14563篇 |
1980年 | 13701篇 |
1979年 | 30543篇 |
1978年 | 21158篇 |
1977年 | 17827篇 |
1976年 | 16748篇 |
1975年 | 17632篇 |
1974年 | 21543篇 |
1973年 | 20720篇 |
1972年 | 18891篇 |
1971年 | 17800篇 |
1970年 | 16314篇 |
1969年 | 15294篇 |
1968年 | 13967篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
71.
William R. C. Knight Cara R. Baker Nyree Griffin Wahyu Wulaningsih Mark Kelly Andrew R. Davies James A. Gossage 《British journal of cancer》2021,124(10):1653
Background A high Mandard score implies a non-response to chemotherapy in oesophageal adenocarcinoma. However, some patients exhibit tumour volume reduction and a nodal response despite a high score. This study examines survival and recurrence patterns in these patients.Methods Clinicopathological factors were analysed using multivariable Cox regression assessing time to death and recurrence. Computed tomography-estimated tumour volume change was examined in a subgroup of consecutive patients.Results Five hundred and fifty-five patients were included. Median survival was 55 months (Mandard 1–3) and 21 months (Mandard 4 and 5). In the Mandard 4 and 5 group (332 patients), comparison between complete nodal responders and persistent nodal disease showed improved survival (90 vs 18 months), recurrence rates (locoregional 14.75 vs 28.74%, systemic 24.59 vs 48.42%) and circumferential resection margin positivity (22.95 vs 68.11%). Complete nodal response independently predicted improved survival (hazard ratio 0.34 (0.16–0.74). Post-chemotherapy tumour volume reduction was greater in patients with a complete nodal response (−16.3 vs −7.7 cm3, p = 0.033) with no significant difference between Mandard groups.Conclusion Patients with a complete nodal response to chemotherapy have significantly improved outcomes despite a poor Mandard score. High Mandard score does not correspond with a non-response to chemotherapy in all cases and patients with nodal downstaging may still benefit from adjuvant chemotherapy.Subject terms: Oesophageal cancer, Surgical oncology 相似文献
72.
A case of bullous pemphigoid associated with psoriasis vulgaris showing Hailey–Hailey disease‐like histopathological changes in regenerated epidermis without genomic mutation in ATP2C1 or ATP2A2 gene
下载免费PDF全文
![点击此处可从《Journal of the European Academy of Dermatology and Venereology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
73.
F. Fruzzetti G. Palla A. Sbrana T. Simoncini M. R. Sessa 《Gynecological endocrinology》2020,36(10):938-940
AbstractObjective: To understand the origin of extremely high gonadotropin levels in a perimenopausal woman.Methods: A 52-year-old woman with a 2?months of amenorrhea followed spontaneous menstrual cycles recovery was referred to our outpatient clinic with elevated follicle-stimulating hormone (FSH, 483 mUI/ml), luteinizing hormone (LH, 475 mUI/ml) and prolactin (PRL, 173?ng/ml). She was known to take levosulpiride. The gonadotropin levels did not fit with the clinical features.Results: A gonadotroph tumor was ruled out. Further analysis confirmed constantly high FSH, LH and PRL levels. The measurements were repeated using different analytical platforms with different results. After serial dilutions, nonlinearity was present suggesting an immunoassay interference. After post-polyethylene glycol recovery, hormone levels appeared in the normal range. Anti-goat antibodies were recognized in the serum of the patient.Conclusions: This case report shows a case of falsely abnormal high gonadotropin and PRL levels in a woman during menopause transition. In the clinical practice the evaluation of gonadotropin profile is not recommended at this age, but the abnormal levels stimulated further evaluation. An interference in the assay due to anti-goat antibodies resulted in abnormally high level of FSH and LH. A strict collaboration between clinicians and the laboratory is needed, when laboratory findings do not correspond to clinical findings. 相似文献
74.
75.
Feasibility and Diagnostic Potential of Pulmonary Transit Time Measurement by Contrast Echocardiography: A Pilot Study
下载免费PDF全文
![点击此处可从《Echocardiography (Mount Kisco, N.Y.)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
76.
Weiyu Ye Anna Olsson-Brown Robert A. Watson Vincent T. F. Cheung Robert D. Morgan Isar Nassiri Rosalin Cooper Chelsea A. Taylor Umair Akbani Oliver Brain Rubeta N. Matin Nicholas Coupe Mark R. Middleton Mark Coles Joseph J. Sacco Miranda J. Payne Benjamin P. Fairfax 《British journal of cancer》2021,124(10):1661
Background Immune checkpoint blockers (ICBs) activate CD8+ T cells, eliciting both anti-cancer activity and immune-related adverse events (irAEs). The relationship of irAEs with baseline parameters and clinical outcome is unclear.Methods Retrospective evaluation of irAEs on survival was performed across primary (N = 144) and secondary (N = 211) independent cohorts of patients with metastatic melanoma receiving single agent (pembrolizumab/nivolumab—sICB) or combination (nivolumab and ipilimumab—cICB) checkpoint blockade. RNA from pre-treatment and post-treatment CD8+ T cells was sequenced and differential gene expression according to irAE development assessed.Results 58.3% of patients developed early irAEs and this was associated with longer progression-free (PFS) and overall survival (OS) across both cohorts (log-rank test, OS: P < 0.0001). Median survival for patients without irAEs was 16.6 months (95% CI: 10.9–33.4) versus not-reached (P = 2.8 × 10−6). Pre-treatment monocyte and neutrophil counts, but not BMI, were additional predictors of clinical outcome. Differential expression of numerous gene pathway members was observed in CD8+ T cells according to irAE development, and patients not developing irAEs demonstrating upregulated CXCR1 pre- and post-treatment.Conclusions Early irAE development post-ICB is associated with favourable survival in MM. Development of irAEs is coupled to expression of numerous gene pathways, suggesting irAE development in-part reflects baseline immune activation.Subject terms: Immunotherapy, Melanoma 相似文献
77.
78.
79.
80.