<rp id="qef5y"></rp>

        <font id="qef5y"></font>

        <rp id="qef5y"></rp>
          官方APP下载:英语全能特训(微信小程序版,支持苹果手机、安卓手机)
          创办于2003年
          UNSV记不???那就记中文谐音“忧安思?!卑?!
            Slow and Steady Wins the Race!
          UNSV英语学习频道 - Slow and steady wins the race!
          公众微信服务号
          英语全能特训(微信公众服务号)
          UNSV英语学习频道淘宝网店
          客服短信:18913948480
          客服邮箱:web@unsv.com
          初级VIP会员
          全站英语学习资料下载。
          ¥98元/12个月

          Drug Developers Take Aim at 'Guided-Missile' Cancer Drugs

          阅读次数:


          VIP会员专享下载:(非VIP会员无权下载!如果想下载,但还不是VIP会员,请点此订购
          下载方式:使用鼠标右键(注意是鼠标右键?。┑慊飨旅娴腗P3音频/MP4视频链接,然后选择“另存为…”。
          MP3节目录音 MP3节目录音 
          文章原文
          同步字幕

          Companies are testing a record 89 treatments on humans to fight cancer. These treatments combine antibodies from the body's natural defense system with agents that fight cancer.

          They are testing what they call antibody-drug conjugates, or ADCs.

          Researchers describe ADCs as "guided missiles" in the fight against cancer. They are designed to target cancer cells and then release cytotoxins – substances that have a toxic or poisonous effect on the cells.

          ADCs are up to 10,000 times as powerful as most chemotherapy treatments. They also reduce damage to healthy tissue.

          Developing ADCs has been a major aim for the biotechnology industry for years. Many experimental ADCs, however, failed because of the difficulty of combining the right antibody with the right cancer-killing substance. Some ADCs were found to be too weak. Others were too harmful.

          From 2000 to 2018, only five ADCs won official approval. Only one ADC, developed by drug maker Roche, has reached $1 billion in yearly sales. It was approved in 2013 to treat breast cancer. Studies showed the drug increased the chances of disease-free survival for some patients compared with the usual treatment.

          FILE - This undated fluorescence-colored microscope image made available by the National Institutes of Health in September 2016 shows a culture of human breast cancer cells.
          FILE - This undated fluorescence-colored microscope image made available by the National Institutes of Health in September 2016 shows a culture of human breast cancer cells.

          In 2019, U.S. officials approved three ADCs, the most ever in a single year. One of them was the breast cancer drug Enhertu, developed by AstraZeneca and Daiichi Sankyo. It was shown to help patients who had failed numerous treatments.The drug helped them survive more than 16 months on average before their disease worsened.

          Padcev, a bladder cancer drug, received approval in December. Research showed that 44% of patients who had failed immunotherapy showed improvement when they were tested after treatment. In some cases, patients showed no evidence of cancer. The drug is a product of two companies, Astellas and Seattle Genetics.

          Another drug, Polivy, was approved in June to treat lymphoma. When combined with two other treatments, 40% of patients showed no sign of disease. Polivy is a product of the Swiss drug maker Roche.

          New record

          Reuters news agency says the biotechnology industry is growing hopeful about the effectiveness of ADCs.

          Information provided by Beacon Targeted Therapies shows that the number of ADC drug candidates is at record levels. Many more ADCs are being considered before human testing is permitted.

          Beacon advises drug makers on targeted treatments. The service helps them decide whether to continue working on possible drugs or redirect efforts.

          Current ADC projects include GlaxoSmithKline testing a drug to fight multiple myeloma.

          ADC Therapeutics has launched several studies on experimental drugs for treating blood cancers and solid tumors.

          And ImmunoGen, based in the American state of Massachusetts, is developing an ADC to treat ovarian cancer. In December, the U.S. Food and Drug Administration said the drug might become a candidate for a faster than normal approval.

          The increase in ADC investment is partly because of improvements in what researchers are calling "linker" technology. The linker joins the antibody to the cancer-killing cytotoxins.

          Giuseppe Curigliano is clinical director of early drug development at the European Institute of Oncology in Milan. He told Reuters, "There is a revival again because there is a new generation of molecules in which the linker is more efficient."

          I'm Anne Ball.

          Ludwig Burger and John Miller reported this story for the Associated Press. Jonathan Evans adapted it for VOA Learning English. George Grow was the editor.

          What do you think of this story? Leave a comment below.

          ----------------

          Words in This Story

          chemotherapy n. the use of chemical agents to treat disease

          immunotherapy – n. treatment or prevention of disease that involved suppression or strengthening the body's natural defenses against disease

          网友的学习评论(0条):
          版权所有©2003-2019 南京通享科技有限公司,保留所有权利。未经书面许可,严禁转载本站内容,违者追究法律责任。 互联网经营ICP证:苏B2-20120186
          网站备案:苏ICP备05000269号-1中国工业和信息化部网站备案查询
          广播台
          精挑细选三肖六码