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WASHINGTON, Nov. 24 (Xinhua) -- An inexpensive drug that treats Type 2 diabetes has been shown to prevent a number of natural and man-made chemicals from stimulating the growth of breast cancer cells, according to a newly published study by a Michigan State University researcher. The research, led by pediatrics professor James Trosko and colleagues from South Korea's Seoul National University, provides biological evidence for previously reported epidemiological surveys that long-term use of the drug metformin for Type 2 diabetes reduces the risk of diabetes-associated cancers, such as breast cancers.The research appeared online this week in PLoS One.For the study, Trosko and colleagues focused on the concept that cancers originate from adult human stem cells and that there are many natural and man-made chemicals that enhance the growth of breast cancer cells. Using culture dishes, they grew miniature human breast tumors, or mammospheres, that activated a certain stem cell gene. Then the mammospheres were exposed to natural estrogen -- a known growth factor and potential breast tumor promoter -- and man-made chemicals that are known to promote tumors or disrupt the endocrine system.The team found that estrogen and the chemicals caused the mammospheres to increase in numbers and size. However, with metformin added, the numbers and size of the mammospheres were dramatically reduced. While each of the chemicals enhanced growth by different means, metformin seemed to be able to inhibit their stimulated growth in all cases."While future studies are needed to understand the exact mechanism by which metformin works to reduce the growth of breast cancers, this study reveals the need to determine if the drug might be used as a preventive drug and for individuals who have no indication of any existing cancers," Trosko said.

UNITED NATIONS, Nov. 18 (Xinhua) -- China on Friday voiced its hope that countries concerned "will continue to appropriately address the issue" of the alleged plot to kill Saudi Arabian ambassador to the United States "through dialogue and make joint efforts to maintain peace and stability in the Middle East and the Gulf region."The statement came as Li Baodong, Chinese permanent representative to the United Nations, was addressing the UN General Assembly to explain the Chinese position on the issue after he abstained from voting on the draft resolution on the alleged Iranian involvement in the assassination plot."China hopes countries concerned will continue to appropriately address the issue through dialogue and make joint efforts to maintain peace and stability in the Middle East and the Gulf region," he said."At present, the case is highly complicated and sensitive," Li said. "Parties still have different views over the issue. Any conclusion or action must be based on comprehensive, impartial, objective and transparent investigation and substantial evidence.""Before facts are out, parties should adopt a prudent approach, refrain from jumping to conclusions, and avoid action that may complicate and worsen the situation," he said."China abstained from the vote on the General Assembly draft resolution entitled 'Terrorist Attacks on Internationally Protected Persons'," he said. "We oppose all forms of terrorism, and always stand for compliance with international law and the basis norms governing international relations in handling state-to- state relations as well as effective protection of the safety and security of diplomatic personnel."Earlier on Friday, the UN General Assembly adopted a resolution which expressed deep concerns at the assassination plot and called on Iran "to comply with all of its obligations under international law." Iran strongly denied the allegation.Before or after the vote, countries such as Bolivia, Sudan and Venezuela said that due to a lack of solid evidence to support the allegation, the draft adoption would "create a dangerous precedent " in the international relations.

BEIJING, Nov. 1 (Xinhua) -- Commander-in-chief of China's manned space program Chang Wanquan announced early Tuesday that the launch of Shenzhou-8 unmanned spacecraft is successful.The spacecraft was successfully sent into the designated orbit after the blastoff at 5:58 a.m. at the Jiuquan Satellite Launch Center in northwestern desert area, carried by an upgraded Long March-2F rocket.It is heading to rendezvous with the Tiangong-1, or "Heavenly Palace-1" that was put into space on Sept. 29 for the country's first space docking.The docking, if successful, will pave the way for China to operate a permanent space station around 2020, and make the nation the world's third to do so.The launch was attended by Chinese Vice Premier Zhang Dejiang. It was also observed by senior experts from the European Space Agency and the German Aerospace Center at the launch site.The docking will happen within two days after the launch of the Shenzhou-8 at a height of 343 km above Earth's surface. The spacecraft will return to Earth after two docking operations.

RIO DE JANEIRO, Dec 15 (Xinhua) -- Brazilian President Dilma Rousseff Thursday signed a law banning smoking in public spaces and tobacco advertising at sale places in his country.Smoking in all enclosed public spaces, defined as free access areas used simultaneously by several people, is forbidden in the new law.It also prohibits tobacco advertising such as posters or banners at sale places. Previously the ban was only imposed on TV, radio and billboards advertising.In addition, the law increases the taxes and establishes minimum prices over the tobacco products to discourage buyers, therefore the cigarettes prices are expected to increase 20 percent in 2012 and 55 percent by 2015.Health warnings are also required on both sides of cigarette packs to alert consumers about the consequences of their smoking habit.The law is welcomed by some anti-smoking groups."In addition to protecting the health of its citizens, Brazil has also set an example for the world," said Matthew Myer, president of Campaign for Tobacco-Free Kids.

BANGKOK, Nov. 4 (Xinhua) -- Hundreds of Bangkok residents gathered in the city centre on Thursday, making ten thousand micro-organism balls to help clean the polluted water in flooded areas.Organized by local volunteer groups, the activity aimed to make 10,000 Effective Micro-organism balls (EM Ball), which are proven to be efficient in cleaning contaminated floodwater.According to Danal Chanchaochai, the organizer of the event, people in flooded areas were facing critical conditions as germs may spread in polluted water and threat their health. Mainly consist of soil, rice bran and micro-organisms, a tennis-sized EM Ball is capable to clean up 10 liter of water and can last for as long as one month, which making it a perfect water sanitizer.Another main objective of the event was to educate citizens on the simple steps of making EM Balls, in case of more flood in the city, he said.The organization had generated buzz on social media sites like facebook and twitter, calling everyone to help.Held at Amarin Plaza, one shopping mall at city centre, the activity attracted groups of volunteers, including office workers, local students and even foreign visitors.Volunteers were lining up to get the raw materials from the collection point and gave back completed EM Balls to the distribution centre in boxes. Residents needed to present their identity cards in order to retrieve the donated water cleaners.Volunteer Kulawan Ayura Chai said that, although her house hadn' t been affected by water yet, she understood the difficult situation faced by the victims and felt responsible to help.Lasted for three days from Thursday to Saturday, the activity aimed to make 100,000 EM Balls, adding to the 30,000 balls made earlier, to distribute to the flood victims in Bangkok and other regions in Thailand.