Clinical Research Directory

Response Times in Danish Emergency Medical Services

The overall aim of this retrospective observational study is to investigate the association of emergency medical services response time with patient survival and treatment outcomes. The main question it aims to answer is: What is the association between response time and patient survival? The investigators will collect data for all patients who were treated by ambulance and/or helicopter services in Denmark and follow the patient's path from illness or injury to discharge from hospital with a focus on the significance of ambulance and helicopter response time.

Evaluation of Intra-operative Photographs for the Assessment of a Proper Lymphadenectomy in Minimally-invasive Gastrectomies for Gastric Cancer (PhotoNodes)

Even after the wide introduction of chemo/radiotherapy in the treatment algorithm, adequate surgery remains the cornerstone of gastric cancer treatment with curative intent. A proper D2 lymphadenectomy is associated with improved cancer specific survival as confirmed in Western countries by fifteen-year follow-up results of Dutch and Italian randomized trials. In clinical practice, the total number of harvested lymph nodes is often considered as a surrogate marker for adequate D2 lymphadenectomy; nonetheless, the number of retrieved nodes does not necessarily correlate with residual nodes, which intuitively could represent a more reliable marker of surgical adequacy. The availability of an efficient tool for evaluating the absence of residual nodes in the operative field at the end of node dissection could better correlate with survival outcomes. The goal of this multicentric observational prospective study is to test the reliability of a new score (PhotoNodes Score) created to rate the quality of the lymphadenectomy performed during minimally invasive gastrectomy for gastric cancer. The score is assigned by assessing the absence of residual nodes at the end of node dissection on a set of laparoscopic/robotic high quality intraoperative images collected from each patient undergoing a minimally invasive gastrectomy with D2 node dissection. Ideally, this tool could be a new indicator of the quality of D2 dissection and could assume a prognostic role in the treatment of gastric cancer.

A Prospective Cohort Study Comparing Disparity in Surgical Procedure (Wide Local Excision Only vs Any Other Surgery Procedures) Among the Elderly Breast Cancer Patients

The incidence and mortality rates of breast cancer are still increasing in both developing and developed countries. The number of women ≥70 years who are affected by breast cancer (BC) worldwide is also on the increase. Based on the largest population and increasing aging, BC is also rapidly increasing among the elderly in China. According to the epidemiological profile data regarding BC in China, the second onset age peak of BC morbidity occurred after 70 years old and in 2020, the proportion of patients older than 65 is expected to exceed one-fifth and reach 27.0% by 2030. However, some controversies remain to be resolved due to the lack of high quality evidence. The tumor biological behavior, treatment choice and treatment tolerance among the elderly prominently differ from their young counterparts. Besides, they are rarely enrolled in large-scale randomized clinical trials or prospective cohort studies and the results are obtained mainly from retrospective studies. Also, frequent deviations from the standard guidelines lead to insufficient or excessive treatments, though the so-called standard guidelines are based on the clinicopathological characteristics and research findings among the younger BC patients. Studies focusing on the global population confirmed that the biological behavior of tumors among elderly patients was more favorable compared with younger patients but did not transform into survival benefits eventually. Numerous prospective, randomized trials have demonstrated that breast conserving surgery (BCS), consisting of segmental mastectomy and radiation treatment with or without axillary lymph node dissection (ALND), is equivalent to mastectomy in terms of overall survival (OS) and disease free survival (DFS) for patients with early stage breast carcinoma. Presentation of the ACOZOG-Z011 study results in 2011 resulted in a downward trend in the use of a completion axillary lymph node dissection in early breast cancer patients with 1-2 positive sentinel lymph nodes (SLN), treated with wide local excision (WLE) and whole breast irradiation. However, there is little evidence regarding the optimal axillary treatment in elderly breast cancer patients, since these patients are often excluded from clinical trials. We had done a retrospective study of breast cancer in the elderly, which demonstrated that those who with complex comorbidities receiving wide local excision merely were about 1.5 times more than those who without (71.2% vs 46.0%, p\<0.001). However, it is paradoxical that, on the one hand, the risk of dying from breast cancer may increase if patients do not receive the standard treatment; on the other hand, they could not live long enough to benefit or even suffer more from the standard treatment. The key is to figure out who they are. Given the high proportion of patients treated only with WLE, we believe that it is important to compare the effects of different surgical procedures on prognosis among the elderly BC patient in a prospective cohort study, to be more specific, comparing the WLE versus any other surgical procedures.