Biology of the Prostate Cancer Prevention Trial (PCPT)

前列腺癌预防试验 (PCPT) 的生物学

• 批准号: 6907173
• 负责人: SCOTT M LIPPMAN
• 金额: $ 259.14万
• 依托单位: UNIVERSITY OF TX MD ANDERSON CAN CTR
• 依托单位国家: 美国
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-05-01 至 2010-04-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6907173
• 关键词: cancer prevention; chemoprevention; human data; meta analysis; prostate neoplasms

Prostate cancer is the most frequent non-skin cancer, the second leading cause of cancer death in U.S. men, and is increasing in incidence. Effective prevention requires a better understanding of the etiology of prostate cancer, a major goal of this P01's biological studies of the historical Prostate Cancer Prevention Trial (PCPT). A randomized, controlled trial of finasteride in 18,882 men, the PCPT found a 24.8% decrease in overall prostate cancer risk and an apparently increased risk of high-grade disease (New England Journal of Medicine [NEJM], July 2003). Prostate cancer is an androgen-dependent disease, and finasteride inhibits 5a-reductase, thus blocking the conversion of testosterone (by 5a-reductase) to dihydrotestosterone, the most active prostate androgen. The five proposed highly interactive P01 studies of the PCPT are: Project 1, Androgen Metabolism; Project 2, Diet and Diet-Related Factors; Project 3, Insulin-like Growth Factor Axis and Insulin Resistance; Project 4, Genotypic and Phenotypic Studies of Inflammation; and Project 5, Oxidative Damage and DNA Repair. These projects will use nested case (n=1800)-control (n=1800) designs to develop the P01 theme, which is the genetic, metabolic and environmental factors associated with the risk of prostate cancer overall or high-grade disease and the effects of these factors on finasteride preventive efficacy. The mechanisms underlying these risk-factor associations also will be assessed. Major elements of the P01 theme are the study (1) of genetic polymorphisms to identify molecular prostate cancer risk factors and determine pharmacogenetic profiles and (2) of somatic mutations to discover the mechanisms underlying increased high-grade prostate cancer risk associated with finasteride. The P01 provides each project access to the invaluable repository of PCPT biospecimens and data. Each project is closely linked by interactive specific aims and planned collaborations with the other 4 projects and 3 cores. Unique P01 strengths include its biopsy-confirmed control group, the value of which is underscored by PCPT data indicating a substantial prevalence of cancer and high-grade disease in men with "normal" prostate-specific antigen and digital rectal exam (NEJM, May 2004), and standard centralized histological classifications. With fully clarified interactions and a large amount of highly relevant new preliminary data, this resubmitted P01 promises to develop comprehensive prostate cancer risk models important to the future study and prevention of prostate cancer.

前列腺癌是最常见的非皮肤癌，是美国男性癌症死亡的第二大原因，并且发病率正在增加。有效的预防需要更好地了解前列腺癌的病因，这是该P01对历史前列腺预防试验（PCPT）的生物学研究的主要目标。 PCPT是一项在18882名男性中的随机对照试验，发现总体前列腺癌风险下降了24.8％，显然增加了高级疾病的风险（New England Medicine杂志[NEJM]，2003年7月）。前列腺癌是一种雄激素依赖性疾病，非那雄胺抑制5A还原酶，因此阻止了睾丸激素（通过5A-还原酶）向二氢睾丸激素（最活跃的前列腺雄激素）的转化。 PCPT的五个高度交互式P01研究是：项目1，雄激素代谢；项目2，饮食和饮食相关因素；项目3，类似胰岛素 生长因子轴和胰岛素抵抗；项目4，炎症的基因型和表型研究；和项目5，氧化损伤和DNA修复。这些项目将使用嵌套的情况（n = 1800）-Control（n = 1800）设计来开发P01主题，该主题是与前列腺癌的整体或高级疾病风险相关的遗传，代谢和环境因素，以及这些因素对原碱性预防效果的影响。这些风险因素关联的基础机制也将被评估。 P01主题的主要要素是遗传多态性的研究（1），以鉴定分子前列腺癌危险因素并确定药物遗传学特征和（2）的体细胞突变，以发现与丁那碱相关的高级前列腺癌风险增加的机制。 P01为每个项目访问PCPT生物测量和数据的宝贵存储库。每个项目都通过交互式特定的目标与其他4个项目和3个核心的计划紧密联系。独特的p01强度包括其活检确认的对照组，其价值由PCPT数据强调，表明具有“正常”前列腺特异性抗原和数字直肠检查的男性的癌症和高级疾病的严重患病率（NEJM，2004年5月，2004年5月），以及标准的集中组织学分类。通过完全澄清的相互作用和大量高度相关的新初步数据，该重新提交的P01有望开发全面的前列腺癌风险模型，对未来研究和预防前列腺癌很重要。