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Effect of Weight Loss on Prostate Cancer Pathology

2018年8月17日 更新者：VA Office of Research and Development
The purpose of this study is to determine if weight loss prior to radical prostatectomy effects chemical substances in the blood stream and prostate tissue that may affect prostate cancer development and progression.

研究概览

地位

完全的

条件

干预/治疗

详细说明

Obesity is an epidemic, a major public health concern, and is a significant risk factor for progression and mortality from prostate cancer. Prior work in the investigators' laboratory in pre-clinical prostate cancer models and in obese men found that a low fat diet, exercise, and weight loss resulted in antiproliferative and pro-apoptotic effects on prostate cancer tissue through mechanisms related to the IGF-axis. The investigators now propose to conduct a prospective, randomized clinical trial in overweight and obese men with prostate cancer undergoing radical prostatectomy to evaluate if weight loss prior to radical prostatectomy results in antiproliferative and pro-apoptotic effects in prostate cancer tissue. The investigators will accomplish this aim by enrolling overweight and obese men with prostate cancer scheduled to undergo radical prostatectomy. Following informed consent, men will be randomized to either immediate radical prostatectomy or to an 8-week weight loss intervention group that will undergo a diet and exercise weight loss program followed by radical prostatectomy. Proliferation and apoptosis of prostate cancer cells in the prostatectomy specimen will be compared between the groups and relative to the baseline prostate needle biopsy specimens. Further studies will evaluate potential serum surrogate biomarkers that the investigators developed in the investigators' laboratory (ex-vivo serum bioassays) and serum and tissue IGF-axis proteins that have previously been related to obesity, weight loss, and prostate cancer progression. The goal of the investigators' project will be to evaluate the potential anticancer effects of weight loss on prostate cancer tissue and to identify surrogate serum biomarkers that reflect antiproliferative and pro-apoptotic tissue effects and can be applied to future secondary prevention trials in overweight and obese prostate cancer survivors.

研究类型

介入性

注册 (实际的)

44

阶段

  • 不适用

联系人和位置

本节提供了进行研究的人员的详细联系信息，以及有关进行该研究的地点的信息。

学习地点

  • 美国
    • California
      • West Los Angeles、California、美国、90073
        • VA Greater Los Angeles Healthcare System, West Los Angeles, CA

参与标准

研究人员寻找符合特定描述的人，称为资格标准。这些标准的一些例子是一个人的一般健康状况或先前的治疗。

资格标准

适合学习的年龄

  • 孩子
  • 成人
  • 年长者

接受健康志愿者

不

有资格学习的性别

男性

描述

Inclusion Criteria:

  • Subject is overweight or obese (BMI > 25 kg/m2)
  • Patient with pathologically confirmed adenocarcinoma of the prostate and has elected to undergo radical prostatectomy
  • Willing to delay radical prostatectomy for 5 to 8-weeks if randomized to the weight loss intervention group.
  • Able to adhere to physical activity intervention (able to walk for 30 minutes without rest)
  • Able to come to the VA for weight loss visits during the 5 to 8-wk study

Exclusion Criteria:

  • Any one of the following: Gleason grade > 4+4, PSA > 20.
  • History of ever receiving androgen deprivation therapy, antiandrogen therapy, or finasteride
  • Prior prostate radiotherapy (external beam or brachytherapy) or prior cryotherapy
  • Diagnosis of diabetes mellitus and on insulin**
  • Current use of weight loss medications or enrolled in a diet/weight loss program
  • Current use of lycopene supplements*** Significant co-morbidities (i.e. cardiac, pulmonary, liver disease, ongoing alcohol/drug abuse) Cardiac pacemaker

学习计划

本节提供研究计划的详细信息，包括研究的设计方式和研究的衡量标准。

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：无（打开标签）

武器和干预

参与者组/臂
干预/治疗
实验性的：Arm 1: Weight Loss
Weight Loss Group
行为的：Weight Loss
Subjects undergo a weight loss intervention prior to radical prostatectomy. The intervention includes weekly visits with the dietician, DEXA scanning, blood draws, and anthropometrics.
有源比较器：Arm 2: No Weight Loss
No Weight Loss Group
其他：No Weight Loss Group
These subjects do not undergo a weight loss intervention prior to radical prostatectomy. This group does undergo DEXA scanning, blood draws, and anthropometrics prior to radical prostatectomy.

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
Apoptotic Index of the Highest Gleason Grade Malignant Epithelium in the Radical Prostatectomy Specimen Obtained After 8-weeks of the Dietary Intervention
大体时间：8 weeks
The primary objective is to compare the mean apoptotic index in the radical prostatectomy malignant epithelium between the Weight Loss Group and the Control Group-No Weight Loss. The apoptotic index will be measured in the malignant epithelium with the highest Gleason grade. TUNEL staining was used to identify these apoptotic cells and measure the apoptotic index, which is the percent of cells stained from the sample.
8 weeks

次要结果测量

结果测量
措施说明
大体时间
Proliferative Index in Prostate Cancer Epithelium Specimen
大体时间：8 weeks
The proliferative index in prostate cancer epithelium obtained from the radical prostatectomy specimen. This index was procured by staining the Ki67 protein to measure cell proliferation. (Note: Ki67 is a common indicator of cell proliferation.)
8 weeks
Change in Serum IGF-related Analytes: IGF-1
大体时间：baseline and post-intervention
This outcome is the measure of the hormone insulin-like growth factor 1 at baseline vs. post-intervention. We measured and compared the concentration (ng/mL) of this hormone.
baseline and post-intervention
Change in Serum IGF-related Analytes: IGFBP-1
大体时间：baseline and post-intervention
This outcome is the measure of the protein, insulin-like growth factor binding protein 1, at baseline vs. post-intervention. We measured and compared the concentration (ng/mL) of this protein.
baseline and post-intervention
Ex-vivo Mitogenic and Apoptotic Activity of Patient Sera on LNCaP Cells
大体时间：baseline and post-intervention
The BRDU assay measures proliferation of cultured cells such as LNCaP. We expose the cells to the patient blood and see if it inhibits prostate cancer cell growth ex vivo. We use optical density (a measure of the amount of light able to pass through the specimen) to indicate the concentration of cell proliferation.
baseline and post-intervention
Change in Body Weight
大体时间：baseline and post-intervention
This change in body weight is observed by DEXA, a scanner that measures total body composition.
baseline and post-intervention
Change in Percent Body Fat
大体时间：baseline and post-intervention
This change in percent body fat is observed by DEXA, a scanner that measures total body composition.
baseline and post-intervention

合作者和调查者

在这里您可以找到参与这项研究的人员和组织。

赞助

VA Office of Research and Development

调查人员

  • 首席研究员：William Aronson, MD、VA Greater Los Angeles Healthcare System, West Los Angeles, CA

研究记录日期

这些日期跟踪向 ClinicalTrials.gov 提交研究记录和摘要结果的进度。研究记录和报告的结果由国家医学图书馆 (NLM) 审查，以确保它们在发布到公共网站之前符合特定的质量控制标准。

研究主要日期

学习开始

2009年1月1日

初级完成 (实际的)

2016年3月1日

研究完成 (实际的)

2016年3月1日

研究注册日期

首次提交

2007年5月17日

首先提交符合 QC 标准的

2007年5月18日

首次发布 (估计)

2007年5月21日

研究记录更新

最后更新发布 (实际的)

2019年1月31日

上次提交的符合 QC 标准的更新

2018年8月17日

最后验证

2018年8月1日

更多信息

与本研究相关的术语

关键字

其他相关的 MeSH 术语

其他研究编号

  • CLIN-012-06F

此信息直接从 clinicaltrials.gov 网站检索，没有任何更改。如果您有任何更改、删除或更新研究详细信息的请求，请联系 register@clinicaltrials.gov. clinicaltrials.gov 上实施更改，我们的网站上也会自动更新.

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