Effects of Antiplatelet Drugs on Colon Cancer in the Elderly

抗血小板药物对老年人结肠癌的影响

• 批准号: 8829798
• 负责人: LENARD M LICHTENBERGER
• 金额: $ 16.63万
• 依托单位: UNIVERSITY OF TEXAS HLTH SCI CTR HOUSTON
• 依托单位国家: 美国
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-04-01 至 2017-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8829798
• 关键词: Acute; Adhesions; Adverse effects; Affect; Age; Age-Years; Animals; Anti Inflammatory Analgesics; Antihypertensive Agents; Antiplatelet Drugs; Apoptosis; Aspirin; Azoxymethane; Biological Models; Bleeding time procedure; Blood Platelets; Cancer Cell Growth; Cancer Etiology; Cancer Model; Cancer Patient; Cause of Death; Cells; Cessation of life; Chemoprevention; Chemopreventive Agent; Clinical; Clinical Research; Coagulants; Colon Carcinoma; Colorectal; Colorectal Cancer; Degenerative Disorder; Dipyridamole; Disease; Distant; Dose; Drug Costs; Drug Formulations; Drug toxicity; Drug usage; Effectiveness; Elderly; Endothelium; Epithelial; Extravasation; FDA approved; Family; Gastrointestinal tract structure; Goals; Grant; Growth; Growth Factor; Health; Healthcare; Hemorrhage; Human; Immune; In Vitro; Incidence; Killer Cells; Knowledge; Label; Laboratories; Lecithin; Life; Malignant - descriptor; Malignant Neoplasms; Mesenchymal; Meta-Analysis; Metformin; Modeling; Movement; Mus; Neoplasm Circulating Cells; Neoplasm Metastasis; Non-Steroidal Anti-Inflammatory Agents; Oncologist; PTGS2 gene; Patients; Pharmaceutical Preparations; Platelet Activation; Platelet Count measurement; Platelet aggregation; Platelet-Derived Growth Factor; Population; Process; Proliferating; Propranolol; Recommendation; Reporting; Risk; Risk Factors; Risk Reduction; Role; Sales; Second Primary Cancers; Site; Solid Neoplasm; Surface; Testing; Thrombosis; Tissues; Transforming Growth Factors; Ulcer; Vascular Endothelial Growth Factors; age effect; age related; aged; angiogenesis; cancer cell; cancer diagnosis; cancer initiation; carcinogenesis; cardiovascular risk factor; cell growth; chemotherapeutic agent; circulating cancer cell; clopidogrel; colorectal cancer prevention; diabetic; disorder risk; gastrointestinal; human subject; in vivo; juvenile animal; mortality; neoplastic cell; patient population; population based; prevent; response; thrombocytosis; treatment strategy

DESCRIPTION (provided by applicant): Malignant cancers are the second leading cause of death in the USA with colorectal cancer being the second most fatal cancer. The elderly population is particularly at risk for colorectal cancer as its incidence increases with age. Circulating platelets are known to change with age which may affect a variety of degenerative diseases including cancers. Platelets are implicated in the promotion of carcinogenesis and its metastatic spread, and their circulating numbers are reported to be elevated in a number of solid tumors including colorectal cancer. Platelet aggregation with circulating cancer cells appears to protect the cancer cells and promote their metastasis. Recent studies of large populations of patients on low dose antiplatelet therapy (low dose aspirin) for cardiovascular risk reduction, have reported that aspirin confers significant protection against cancer formation, metastases and death. Thus, it is possible that the known chemopreventive activity of aspirin may be related to its antiplatelet action. Our hypothesis is that modulation of platelet activity i important for prevention of colorectal cancer and suppression of metastatic growth. One limitation to the widespread use of aspirin for chemoprevention is its side effect to induce acute gastrointestinal (GI) bleeding that may become life threatening if untreated. This is particularly problem for the elderly, as advanced age is a risk factor for NSAID-induced GI ulceration/bleeding. A recently FDA-approved aspirin product that is GI- safer (Aspirin-PC/PL2200) developed by the PI's laboratory may offer a means to provide significant chemoprevention with reduced GI side effects. We propose to investigate: 1) the in vitro cross-talk between platelets from young and elderly subjects and cancer cells, and their responsiveness to antiplatelet drugs, including various aspirin formulations, notably Aspirin-PC, and other agents; and 2) an in vivo colon cancer [models of both pre-cancer initiation] and metastatic growth in young and old animals for sensitivity to antiplatelet drugs. These studies will contribute to knowledge about the role of platelets in chemoprevention of colorectal cancer in the elderly, and may offer a timely and safe approach to reduce the metastatic spread of cancer in the elderly.

描述（由申请人提供）：恶性癌症是美国第二大死亡原因，结肠直肠癌是第二大致命癌症。老年人患结直肠癌的风险特别高，因为其发病率随着年龄的增长而增加。众所周知，循环血小板会随着年龄的增长而变化，这可能会影响包括癌症在内的各种退行性疾病。血小板与促进癌变及其转移性扩散有关，据报道，在包括结直肠癌在内的许多实体肿瘤中，血小板的循环数量升高。血小板聚集与循环癌细胞似乎保护癌细胞和促进其转移。最近对大量患者进行低剂量抗血小板治疗（低剂量阿司匹林）以降低心血管风险的研究