Purified DNA, fluorescing orange under ultraviolet (UV) light, is extracted and used for molecular biology studies. The purified DNA, in a cesium chloride gradient, binds to the ethidium bromide dye which absorbs UV light and makes the DNA fluoresce orange. This visualization of a single band of DNA aids in the isolation and extraction of the DNA for future molecular biology studies.
Abstracts presented at the 2011 American Society of Clinical Oncology (ASCO) Annual Meeting will have a major impact on both standard-of-care disease management and the future of clinical trials in multiple settings. While it is certainly not possible to adequately discuss the more than 4000 abstracts presented at this important congress, this commentary will highlight a few of the reports that have the potential to change the paradigm for disease management.
A number of commentators have noted that this was the “year of melanoma treatment.” In fact, in the plenary session, 2 paradigmchanging randomized phase III trials involving patients with advanced melanoma were presented. In the first report, investigators randomized patients with metastatic melanoma and a documented activated BRAF mutation to either vemurafenib, an inhibitor of mutated activated BRAF, or dacarbazine. The vemurafenib-treated patient population experienced a strikingly higher objective response rate (48.4% vs 5.5%), progression-free survival (hazard ratio [HR] 0.26, P <0.0001) and overall survival (HR 0.37, P <0.0001). Abstract LBA4
In the second plenary abstract dealing with melanoma, investigators compared dacarbazine with dacarbazine plus ipilimumab, a novel immunotherapy strategy, in a phase III randomized study as primary treatment of either unresectable stage III or metastatic stage IV melanoma. Treatment on the ipilimumab-containing regimen resulted in a higher objective response rate (15.2% vs 10.3%), and improved progression-free response (median 2.8 vs 2.6 months, HR 0.76; P = 0.006) and overall (median 11.2 vs 9.1 months, HR 0.72, P = 0.0009) survival. Three-year overall survival was almost doubled (20.8% vs 12.2%) in the ipilimumab arm. Of note, the duration of response in those individuals randomized to the ipilimumab regimen increased from a median of 8.1 months observed in the dacarbazine arm to 19.3 months. Abstract LBA5
In the realm of gastrointestinal stromal tumors (GIST), a potentially paradigm-changing study explored the impact of 12 months versus 36 months of adjuvant imatinib in a high-risk patient population who received the agent in the adjuvant setting following surgical resection. The study revealed a statistically significant improvement in both 5-year relapse-free survival (65.6% vs 47.9%; HR 0.46; P <0.0001) and 5-year overall survival (92% vs 81.7%; HR 0.45; P <0.019) associated with the extended treatment program. The data not only provide strong support for the superiority of the extended adjuvant treatment program, but also raise the provocative question of whether such treatment should be continued for longer than 3 years. Abstract LBA1
|Title||Expiration Date||CME Credits|
|Community Practice Connections™: 18th Annual International Lung Cancer Congress®||Oct 31, 2018||1.5|
|Clinical Interchange™: Moving Forward From the Status Quo for the Treatment of Soft Tissue Sarcoma: Key Questions and New Answers to Optimize Outcomes||Oct 31, 2018||2.0|