A．A．Right B．B．Wrong C．C．Not mentionedFDA has approved t……
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Using HIV Virus to
Cure Cancer Scientists are planning to use human
immunodeficiency (免疫缺陷) virus (HIV), one of mankind’s most feared viruses, as a
carrier of genes which can fight cancer and a range of diseases that cannot be
cured. The experts say HIV has an almost perfect ability to avoid the body’s
immune (免疫的) defenses, making it ideal for carrying replacement genes into
patients’ bodies, according to the Observer. A team at the
California-based Salk Institute, one of the world’s leading research centers on
biological sciences, has created a special new breed of HIV and has started
negotiations with the U.S. Food and Drug Administration (FDA) to begin clinical
gene therapy (治疗) trials this year. The first trials are expected to involve
patients suffering from cancers that cannot be cured by surgery although project
leader Professor Inder Verma said the HIV technique would have "far wider
applications". The plan remains very likely to cause controversy
since it involves making use of a virus which has caused more than 22 million
deaths around the world in the past two decades. Verma said that the idea of
using HIV for a beneficial purpose was "shocking" but the fierce nature of HIV
had disappeared by having all six of the potentially deadly genes
removed. Illnesses such as various cancers are caused when a
gene in a patient’s body fails to work properly. In the past two years,
breakthroughs in genetics (遗传学) have led gene therapy scientists to try and
replace the genes that do not function normally. Unfortunately,
the body’s immune defenses have been known to attack the modified genes and make
them lose their effects before they can start their task and progress in the
field has been held up by the lack of a suitable carrier. The
HIV virus has the ability to escape from, and then destroy, the immune defense
cells designed to protect our bodies and this makes it attractive to scientists
as a way of secretly conveying replacement genes into patients’
bodies.
FDA has approved the plan of using HIV to cure cancer in humans.
