Ex Vivo Intraarterial Methylene Blue Injection Improve Nodal Staging Accuracy in Colorectal Cancer (MB)
The Impact of ex Vivo Intra-arterial Methylene Blue Injection on Nodal Staging Accuracy and Survival in Colorectal Cancer.
Nodal staging holds both important prognostic and predictive value at colorectal cancer. Regional lymph nodes are located close to the primary tumor in the mesocolon / mesorectum. Current pathology and oncology standards require a separate examination of at least 12 lymph nodes each case to fulfill staging "accuracy" criteria.
In order to reach this number of lymph nodes, a precise surgical technique (total mesorectal excision or complete mesocolic excision), as well as a thorough pathological specimen work-up is needed.
The aim of the study is to investigate, if ex vivo intra-arterial methylene blue injection by the surgeon can help improving nodal harvesting effectivity of the pathologist, hence leading to a better staging and hopefully even to a better outcome in the long run.
In 2014-2015 two surgical centers randomised resected colorectal specimens in 1:1 ratio to methylene-blue injection arm and control (no injection) arm in a total of 200 consecutive cases. Both pathologic and oncologic treatment were led regardless of the injection, reports were just routinely saved in the routine medical documentation.
This retrospective study is designed to recall patient-related, surgery-related factors, as well as pathology reports including nodal staging from the medical databases. The investigators aim to find correlation between methylene blue "staining" and lymph node yield. In addition, the investigators plan to crossmatch methylene blue injection, as a process, with long term survival of the patients.
研究概览
详细说明
Background:
Colorectal Cancer is the second most common cause of death in Hungary. The most important prognostic and predictive factor of colorectal cancer is the stage of disease at the time of diagnosis. Precise staging, especially nodal staging is highly important for correct planning of oncotherapy, i.e. adjuvant chemotherapy. Nodal staging relies on the proper surgical removal of mesocolon/mesorectum belonging to the the affected colorectal segment, as well as on the thorough pathology work-up of the specimen.
Current quality standards require examination of a minimum of 12 lymph nodes in order to reliably report N0 stage.
Methylene-blue injection into the main supplying artery of the removed specimen is one of the simplest and most effective techniques described to aid pathologist in lymph node harvesting.
Technique of methylene blue injection:
First of all, surgeon need to en block remove the affected colorectal segment with its mesecolon/mesorectum. Then the surgeon isolates the main supplying artery and cannulated it with an appropriate-size canula.
Methylene blue solution (50 mg methylene blue diluted in in 30 ml saline) is prepared and injected into the freshly removed specimen via the canula until the blue solution appears on the cut edges of the specimen.
The specimen can be processed in a routine way (placed in 4% formaldehyde).
Aim of the study:
The aim is to investigate if the well described and in Western-European healthcare systems well tested technique (Methylene blue injection) can be effectively adapted in an overwhelmed, busy Eastern-European healthcare environment. (Other techniques, including pathology assistant are not affordable in this area.) Apart form testing diagnostic accuracy of the pathologist on specimens with and without methylene blue injection, the investigators would like to assess a potential survival benefit of the suspected improvement of staging effectivity.
Timing of the study:
Over a 20-month period of 2014 and 2015 two surgical centers in Hungary randomised their elective colorectal resection cases into interventional and control arms. Randomisation was performed with a 1:1 ratio at each site on 100-100 consecutive cases.
Further pathology work-up and reporting has been routinely performed without any specific effect on oncology follow-up or treatment. No specific data collection has been performed after the intervention.
This study aims to retrospectively select the 100-100 (total of 200) consecutive colorectal resection cases of the given time frame from the official hospital medical recording systems.
Pathology reports and other relevant patient clinical records will be collected and statistically assessed.
Ethical approval was requested and gained from the Medical Research Council, Hungary, for the retrospective analysis of patient data.
Statistical analysis:
Power analysis was performed to get the sufficient number of cases (200 cases in total).
Case Report Form The retrospectively included cases will be listed in a specific database on a safe medical server. Anthropometric, disease-specific, operation-specific and pathology report details will be extracted out of the official patient documentation system.
Patients will be included according to the known interventional interval and the operation type (elective colorectal resection). Cases in the database will be anonymized. No patient-identifying data will be recorded or given to the assessor of the study (statistician).
研究类型
注册 (预期的)
阶段
- 不适用
联系人和位置
学习联系方式
- 姓名:Balazs Banky, PhD
- 电话号码:36208231642
- 邮箱:bankybalazs@gmail.com
研究联系人备份
- 姓名:Nora Susztak, MD
- 电话号码:36307283224
- 邮箱:n.susztak@gmail.com
学习地点
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Tatabánya、匈牙利、2800
- St. Borbala Hospital
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参与标准
资格标准
适合学习的年龄
接受健康志愿者
有资格学习的性别
描述
Inclusion Criteria:
- Elective operation.
- Colon or rectum resection performed.
- Malignant colorectal condition.
- Curative intent.
Exclusion Criteria:
- Acute surgery performed
- Final histology: benign
- No other pathologic method (apart form Methylene Blue injection) used to improve lymph node yield
学习计划
研究是如何设计的?
设计细节
- 主要用途:诊断
- 分配:随机化
- 介入模型:并行分配
- 屏蔽:双倍的
武器和干预
参与者组/臂 |
干预/治疗 |
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实验性的:Methylene blue
Methylene blue solution (50 mg in 30 ml of saline solution) was injected in the cannulated main supplying artery of the freshly removed specimen, ex vivo.
Colorectal specimen was then processed in the routine pathological work-up way.
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Methylene blue solution is injected ex vivo in the main supplying artery trunk of the freshly removed colorectal specimen.
(50 mg in 30 ml saline)
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无干预:Control
Colorectal specimens were processed in the routine pathological work-up way.
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研究衡量的是什么?
主要结果指标
结果测量 |
措施说明 |
大体时间 |
---|---|---|
Total number of lymph nodes
大体时间:Within 4 weeks after operation (at pathology work-up)
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Total number of lymph nodes examined by pathologist
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Within 4 weeks after operation (at pathology work-up)
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Positive lymph nodes
大体时间:Within 4 weeks after operation (at pathology work-up)
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Number of positive lymph nodes found by pathologist
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Within 4 weeks after operation (at pathology work-up)
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Nodal staging accuracy
大体时间:Within 4 weeks after operation (at pathology work-up)
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Minimum Nr of 12 lymph nodes examined if reported N stage is N0, or positive lymph node=s) found
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Within 4 weeks after operation (at pathology work-up)
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At least 12 lymph nodes harvested
大体时间:Within 4 weeks after operation (at pathology work-up)
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Minimum Nr of 12 lymph nodes examined by pathologist
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Within 4 weeks after operation (at pathology work-up)
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次要结果测量
结果测量 |
措施说明 |
大体时间 |
---|---|---|
Overall survival
大体时间:5 years (60 months) after operation
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Overall survival after operation (in months)
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5 years (60 months) after operation
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合作者和调查者
调查人员
- 首席研究员:Balazs Banky, PhD、St. Borbala Hospital
研究记录日期
研究主要日期
学习开始 (预期的)
初级完成 (预期的)
研究完成 (预期的)
研究注册日期
首次提交
首先提交符合 QC 标准的
首次发布 (实际的)
研究记录更新
最后更新发布 (实际的)
上次提交的符合 QC 标准的更新
最后验证
更多信息
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Methylene blue injection的临床试验
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Zimmer Biomet终止囊内股骨近端骨折 | Garden I 级股骨颈股骨下骨折 | Garden II 级股骨颈股骨下骨折美国
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Hospital Universitari de Bellvitge招聘中