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   28052篇
  免费   2709篇
  国内免费   589篇
耳鼻咽喉   178篇
儿科学   1046篇
妇产科学   823篇
基础医学   680篇
口腔科学   201篇
临床医学   2186篇
内科学   2553篇
皮肤病学   149篇
神经病学   254篇
特种医学   584篇
外国民族医学   64篇
外科学   3099篇
综合类   3480篇
现状与发展   2篇
预防医学   634篇
眼科学   110篇
药学   2275篇
  20篇
中国医学   819篇
肿瘤学   12193篇
  2024年   64篇
  2023年   355篇
  2022年   837篇
  2021年   1125篇
  2020年   993篇
  2019年   912篇
  2018年   926篇
  2017年   1007篇
  2016年   1239篇
  2015年   1166篇
  2014年   1771篇
  2013年   2239篇
  2012年   1599篇
  2011年   1795篇
  2010年   1357篇
  2009年   1407篇
  2008年   1350篇
  2007年   1508篇
  2006年   1370篇
  2005年   1120篇
  2004年   908篇
  2003年   809篇
  2002年   721篇
  2001年   658篇
  2000年   537篇
  1999年   506篇
  1998年   409篇
  1997年   409篇
  1996年   297篇
  1995年   269篇
  1994年   257篇
  1993年   175篇
  1992年   145篇
  1991年   139篇
  1990年   117篇
  1989年   107篇
  1988年   91篇
  1987年   82篇
  1986年   65篇
  1985年   83篇
  1984年   72篇
  1983年   61篇
  1982年   44篇
  1981年   50篇
  1980年   47篇
  1979年   40篇
  1978年   40篇
  1977年   26篇
  1976年   29篇
  1975年   12篇
排序方式: 共有10000条查询结果,搜索用时 20 毫秒
61.
参附注射液在胃癌术前介入化疗中的作用   总被引:6,自引:1,他引:6  
研究参附注射液在胃癌术前介入化疗中的作用,将87例进展期胃癌患者分成两组。分别检测T细胞亚群、白细胞总数及淋巴细胞数量等。结果:参附组对CD3、CD4,CD4/CD8的提高作用显著高于化疗组,且能保持白细胞及淋巴细胞的数量。提示参附注射液可增强胃癌术前介入化疗的患者的细胞免疫功能。  相似文献   
62.
新辅助化疗在晚期鼻咽癌治疗中的应用价值   总被引:2,自引:0,他引:2  
目的 :探讨新辅助化疗在治疗中晚期鼻咽癌 (nasopharyngealcarcinoma ,NPC)中的应用价值。方法 :经病理检查确诊的 80例中晚期 (Ⅱ~Ⅳ期 )初治NPC患者 ,于放疗前随机分成两组 ,即新辅助化疗 +放射治疗组 (化放组 )和单纯放疗组(单放组 )各 4 0例 ,观察新辅助化疗对肿瘤患者的缓解率和毒副反应 ,对比放射治疗后两组的疗效。结果 :化放组的全身性毒副反应发生率、复发率及转移率均较低 ,而肿瘤控制率及生存率明显高于单放组 ;化疗组与单放组的 5年生存率分别为 6 5 %和 4 2 5 % ,两组间相比较均有显著性差异 (P值均 <0 0 5 )。结论 :对中晚期NPC宜先进行新辅助化疗 ,再行放射治疗 ,可以提高疗效  相似文献   
63.
术前动脉灌注化疗结合手术治疗直肠癌疗效分析   总被引:3,自引:0,他引:3  
张伟  李平  王康  杨春  张天  杨向进 《临床肿瘤学杂志》2004,9(4):374-375,378
目的 :总结和分析直肠癌术前介入灌注化疗 (Pre operativeArteraInfusionChemotherapy ,PAIC)的疗效及其优点 ,探讨直肠癌综合治疗的远期疗效。方法 :应用Seldinger方法经皮右侧股动脉穿刺 ,选择肠系膜下动脉或骼内动脉造影确定肿瘤位置后 ,注入化疗药物。术后一周进行直肠癌根治术。术后采用 5 氟尿嘧啶加甲酰四氢叶酸钙进行 6个疗程的化疗。以同期未行介入灌注治疗而手术的直肠癌患者作为对照组。结果 :PAIC组大多数患者症状、体征减轻 ,肿块缩小。介入灌注化疗前后病理检查发现肿瘤细胞有变性坏死 ,细胞核变性 ,胞浆凝固 ,间质炎细胞浸润及纤维增生等不同程度的改变。术后五年生存率 75 0 0 % ,对照组为 4 5 2 4 % ,对比差异有显著性意义 (P <0 0 5 )。结论 :术前介入灌注化疗作为直肠癌新辅助化疗方法之一是有效、安全的 ,并能提高直肠癌患者的术后长期生存时间。  相似文献   
64.
进展期结直肠癌术前经直肠5-Fu化疗的疗效观察   总被引:2,自引:0,他引:2  
目的 探讨术前经直肠 5 -Fu化疗对进展期结直肠癌术后生存率的影响。方法 统计进展期结直肠癌术前经直肠 5 -Fu化疗病例 112例及对照组 14 4例 ,观察化疗反应情况并比较两组术后并发症、局部复发率、5年生存率。结果 两组术后并发症、局部复发率无显著性差异 (P >0 .0 5 ) ,但化疗组中B期病人及直肠癌病人 5年生存率均显著高于对照组 (P <0 .0 5 )。结论 进展期结直肠癌术前经直肠 5 -Fu化疗是一种有效、安全、方便的治疗措施 ,具有一定的提高生存率的作用 ,可作为术前常规应用。  相似文献   
65.
目的观察高温热疗加放射粒子植入及化疗治疗转移性盆腔肿瘤的疗效.方法将转移性盆腔肿瘤患者分为A、B两组,A组19例,B组22例.A组给予射频加热的同时从电极处灌注2.5%的盐水以扩大肿瘤凝固性坏死的范围.不能热疗的肿瘤边缘组织内植入碘-125粒子.术后第15天开始化疗.奥沙利铂100 mg/m2,静脉滴注,第1天;CF 200 mg/m2,在5-Fu滴注前经静脉滴注2 h,继以5-Fu 200 mg/m2经静脉推注,5-Fu 400 mg/m2经静脉滴注22 h,连续5 d,3周为1周期.B组只给予化疗,化疗用药、剂量及天数与A组相同.结果第6个周期末,A组与B组的有效率分别为84.2%和36.4%,两组有效率比较差异有显著性(P<0.01).两组的毒副反应发生率差异无显著性.结论高温热疗加放射粒子植入及化疗治疗转移性盆腔肿瘤的近期疗效好,并发症少.  相似文献   
66.
BACKGROUND: The toxicity outcome of cancer patients receiving chemotherapy is difficult to predict. In this study the influence of malnutrition and inflammation on acute haematological toxicity was investigated. PATIENTS AND METHODS: Between January 1999 and January 2000, 48 consecutive cancer patients experienced severe haematological toxicity (SHT), either neutropenic fever or severe thrombocytopenia, following various chemotherapy regimens. Their baseline characteristics were compared with those of 59 control patients. Previous chemotherapy regimens, type of chemotherapy, performance status (PS), calculated creatinine clearance, bilirubin, C-reactive protein (1), alpha-1 acid glycoprotein (2), albumin (3), pre-albumin (4) and the nutritional and inflammatory status (NIS) ratio [NIS = (1 x 2)/(3 x 4)] were studied. Statistical analysis was carried out using either a t-test or a chi-square test. A receiver operating characteristic (ROC) curve determined the cut-off value for NIS. RESULTS: Patients experiencing SHT had a higher PS (P <0.001), inflammatory serum protein levels (P <0.001) and NIS ratio (P <0.0001), but lower haemoglobin (P <0.05) and serum-albumin levels (P <0.0001). Using a cut-off of 0 or 1 for PS and 1 for NIS, sensitivity was 98%, 43% and 89%; specificity was 38%, 90% and 66%, respectively. In 37 patients treated with topotecan as single agent, the determinants for SHT were PS (P <0.0001) and NIS (P <0.0001). CONCLUSIONS: Altered nutritional and inflammatory status correlates with increased risk of severe haematological toxicity following anticancer chemotherapy.  相似文献   
67.
BACKGROUND: Locally advanced and/or inflammatory breast cancer (LABC) is a heterogeneous disease. Molecular markers may help to understand this heterogeneity. This paper reports the results of a study assessing the potential prognostic or predictive value of HER-2, p53, cyclinD1, MIB1, ER and PgR expression by immunohistochemistry from patients included in an EORTC-NCIC-SAKK trial. PATIENTS AND METHODS: A total of 448 patients with a cytological or histological diagnosis of LABC were randomised into a trial comparing two anthracycline-based neoadjuvant regimens. Chemotherapy was followed by standard locoregional therapy. Survival was comparable in both arms. We collected and analysed centrally paraffin-embedded tumour specimens from 187 (72.5%) of 258 patients that had a histological diagnosis. RESULTS: Of the patients included in this molecular marker study 114 relapsed and 91 died. In the multivariate analysis p53 positivity was associated with a shorter progression-free survival [hazard ratio (HR) = 1.96; 95% CI 1.33-2.91; P = 0.0008) and a shorter overall survival (HR = 1.98; 95% CI 1.28-3.06; P = 0.002). PgR positivity predicted for a longer overall survival (HR = 0.54; 95% CI 0.35-0.83; P = 0.0045). CONCLUSIONS: p53 was an independent factor predicting for survival. In order to clarify whether p53 is a pure prognostic and/or a predictive factor, a phase III trial is being conducted (EORTC 10994/BIG 00-01 study) using functional assay in yeast from frozen tumour samples.  相似文献   
68.
Serum CA125 concentrations measured before and during chemotherapy may provide additional information for prognostic assessment of patients with epithelial ovarian cancer (EOC), and enable discrimination between patients who are likely to benefit from further therapy and those who will not. Medical records of 40 patients with advanced EOC, treated at the Department of Obstetrics and Gynecology of the University Hospital Nijmegen between July 1984 and April 1993, were examined. All patients had primary cytoreductive surgery followed by platinum-based chemotherapy. Serum samples were obtained before surgery and during chemotherapy. Follow-up information and patient and tumor characteristics were abstracted from medical records until December 1, 1994. By using multivariate Cox proportional hazards models for disease-free and overall survival it was evaluated whether outcome prediction was improved by inclusion of serum CA125 quantitations.
  Only FIGO stage and extent of residual tumor were significant independent prognostic factors before the start of chemotherapy. When such regression models were constructed after subsequent courses of chemotherapy, serum CA125 measurements conducted after each of the first three chemotherapy courses improved the prediction of disease-free survival. Prediction of overall survival was improved by inclusion of serum CA125 measurements after courses 1–6. Inclusion of serum CA125 measurements during chemotherapy improved prognostic assessment of patients with advanced EOC.  相似文献   
69.
The objective of this study was to evaluate cisplatin plus ifosfamide as neoadjuvant chemotherapy with regard to toxicity and clinical response in patients with stage IIB cervical cancer. Sixty-eight patients with previously untreated stage IIB cervical cancer were given two cycles of chemotherapy: cisplatin 20 mg m−2 on Days 1–5, infused over 1 h; ifosfamide 1.2 g m−2 on Days 1–5 infused over 30 min. Mesna 120 mg m−2 was administered as a bolus 15 min before ifosfamide, and a continuous infusion, delivering Mesna 1.2 g m−2, was given subsequently over the next 16 hours. The treatment cycle was repeated on day 21. Responders were then randomized to surgery or radiation therapy. All 68 patients were evaluable for toxicity. Toxicity was found to be acceptable. One patient died at home one month after completion of the second treatment cycle. There was one grade 4 thrombocytopenia. Grade 3 toxicities included anemia in four patients, leucopenia and nausea and vomiting in one patient each. Sixty-two patients were evaluable for response. A clinical response was documented in 44 of the 55 evaluable patients (80%), with 17 complete responses (31%) and 27 partial responses (49%) (95% confidence limits 69%–91%, 19%–43%, and 36%–62% respectively). The intent-to-treat response rate was 64.7%. Twenty-one patients were randomized to surgery and 23 patients to radiation therapy. Amongst the eight patients with a complete clinical response, one patient had a complete pathological response and one patient had residual intra-epithelial neoplasia. The drug combination of cisplatin plus ifosfamide had acceptable toxicity and gave a clinical response rate of 80% in previously untreated patients with stage IIB cervical cancer.  相似文献   
70.
Reports of extragenital malignant mixed Müllerian tumor (MMMT) type though extremely rare have increased. This represents the 15th reported case of MMMT outside the female reproductive tract. A 68-year-old black woman presenting with abdominal pain, increasing abdominal girth, and a provisional diagnosis of ovarian carcinoma, underwent exploratory laparotomy, total abdominal hysterectomy, omentectomy and cytoreductive surgery. Surgery and histology revealed MMMT of heterologous type in the pelvic peritoneum, with no tumor in the genitalia and no foci of endometriosis. Despite surgical debulking leaving residual tumor of less than 1 cm followed by aggressive systemic chemotherapy, the patient died of disease within 2 months. Increasing exploratory surgery may account for the increase in reports of extragenital MMMT. Aggressive tumor debulking and multiagent systemic chemotherapy is of limited efficacy since extragenital MMMT, like uterine MMMT with pelvic spread, has short survival.  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