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Loại hóa chất tìm thấy trong các sản phẩm bao cao su, núm vú giả, găng tay cao su... có thể gây ung thư nguy hiểm cho con người.
Các nhà khoa học đến từ Tổ chức Y tế Thế giới (WHO) đã đưa ra kết luận rằng chất MBT – chất xúc tiến được sử dụng trong quá trình sản xuất cao su là một chất có thể gây ra ung thư ở con người và nên được liệt vào danh sách những chất gây ung thư.
Theo đó, hóa chất này được tìm thất trong hầu hết các sản phẩm, vật dụng gia đình rất quen thuộc như găng tay cao su, thảm trải sàn làm bằng hạt cao su, lốp xe, ống thông y tế, giường không khí, mũ bơi, kính bảo hộ, núm vú giả cho trẻ sơ sinh…
Tìm thấy chất gây ung thư độc hại trong bao cao su, núm vú giả...
Tại cuộc họp tại Lyon, Pháp, 24 chuyên gia đến từ 8 quốc gia trên thế giới cho biết MBT là chất “có thể gây ung thư”, chỉ đứng sau tác nhân là thuốc lá, sợi amiăng và các nguyên nhân khác. Nghiên cứu của Giáo sư Tom Sorahan từ trường Đại học Birmingham (Anh), chất MBT có trong các sản phẩm từ cao su có mối liên kết với các bệnh ung thư bàng quang, ung thư ruột và một loại ung thư máu.
Chất MBT đã được chứng minh là làm tăng nguy cơ gây ung thư cho động vật, đồng thời, theo báo cáo về nghiên cứu được đăng trên Tạp chí Lancet Oncology của WHO, nó cũng có khả năng rất lớn gây hại cho con người.
Trong khi đó, trên trang Mail Online, phát ngôn viên cho biết: "MBT được sử dụng chủ yếu trong sản xuất các sản phẩm cao su. Những công nhân làm trong các ngành công nghiệp hóa chất và cao su là những người tiếp xúc nhiều nhất. Ngược lại, người tiêu dùng khi sử dụng các sản phẩm cao su như găng tay, giày dép… chỉ tiếp cúc với một hàm lượng MBT nhỏ qua da và nguy cơ gây hại cho họ thì vẫn chưa được nghiên cứu”.
Tuy nhiên, Tiến sĩ Michael Warhurst của nhóm chiến dịch CHEM Trust cũng cho biết: "Chúng ta cần hệ thống quản lý tốt hơn nữa để bảo vệ an toàn cho chính chúng ta và người tiêu dùng có quyền được biết và quan tâm về vấn đề này cũng như có quyền hỏi các đại lý bán lẻ xem liệu hóa chất MBT này có trong các sản phẩm họ mua hay không để bảo đảm an toàn sức khỏe”.
For all its peculiar horror, cancer comes with a saving grace. If nothing else can stop a tumor's mad evolution, the cancer ultimately dies along with its host. Everything the malignant cells have learned about outwitting the patient's defenses — and those of the oncologists — is erased. The next case of cancer, in another victim, must start anew.
Imagine if instead, cancer cells had the ability to press on to another body. A cancer like that would have the power to metastasize not just from organ to organ, but from person to person, continuing to evolve deadly new skills along the way.
While there is no sign of an imminent threat, several recent papers suggest that the eventual emergence of a contagious human cancer is within the realm of medical possibility. This would not be a disease, like cervical cancer, that is triggered by the spread of viruses, but rather one in which cancer cells actually travel from one person to another and thrive in their new location.
So far this is known to have happened only under the most unusual circumstances. A 19-year-old laboratory worker who pricked herself with a syringe of colon cancer cells developed a tumor in her hand. A surgeon acquired a cancer from his patient after accidentally cutting himself during an operation. There are also cases of malignant cells being transferred from one person to another through an organ transplant or from a woman to her fetus.
More from The New York Times:
In developing world, cancer is a very different disease
Two naked mole rats, seemingly immune to cancer, got cancer
Elephants: large, long-living and less prone to cancer
In developing world, cancer is a very different disease
Two naked mole rats, seemingly immune to cancer, got cancer
Elephants: large, long-living and less prone to cancer
On each of these occasions, the malignancy went no farther. The only known cancers that continue to move from body to body, evading the immune system, have been found in other animals. In laboratory experiments, for instance, cancer cells have been transferred by mosquitoes from one hamster to another. And so far, three kinds of contagious cancers have been discovered in the wild — in dogs, Tasmanian devils and, most recently, in soft shell crabs.
The oldest known example is a cancer that spreads between dogs during sexual intercourse — not as a side effect of a viral or bacterial infection, but rather through direct conveyance of cancer cells. The state of the research is described in a review, "The Cancer Which Survived," published last year by Andrea Strakova and Elizabeth P. Murchison of the University of Cambridge.
The condition, canine transmissible venereal tumor disease, is believed to have sprung into existence 11,000 years ago — as a single cell in a single dog — and has been circulating ever since. (Why did this happen in dogs and not, say, cats? Perhaps because of what the authors demurely call the dogs' "long-lasting coital tie" — the half an hour or so that a male and female are locked in intercourse, tearing genital tissues and providing the cancer cells with a leisurely crossing.)
Normally a cancer evolves in a single body over the course of years or decades, accumulating the mutations that drive it to power. But to have survived for millenniums, researchers have proposed, canine cancer cells may have developed mechanisms — like those in healthy cells — to repair and stabilize their own malignant genomes.
Early on, cancer cells typically flourish by disabling DNA repair and ramping up the mutational frenzy. Somewhere along the way, the age-old canine cells may have reinvented the device to extend their own longevity. There is also speculation that this cancer may have learned to somehow modify canine sexual behavior in ways that promote the disease's spread and survival.
The second kind of contagious cancer was discovered in the mid-1990s in Tasmanian devils, which spread malignant cells as they try to tear off one another's faces. Though it may be hard to sympathize, devil facial tumor disease threatens the creatures with extinction.
With so few examples, transmissible cancer has been easy to dismiss as an aberration. But in December, scientists at the Universities of Tasmania and Cambridge reported in Proceedings of the National Academy of Sciences that Tasmanian devils are passing around another kind of cancer — genetically distinct from the first. It's weird enough that one such cancer would arise in the species. What are the chances that there would be two?
One theory is that the animals are unusually vulnerable. Driven so close to extinction — by climate change, perhaps, or human predators — the species is lacking in genetic diversity. The cells of another devil injected through a vicious wound may seem so familiar that they are ignored by the recipient's immune system. If some of the cells carry the mutations for the facial cancer, they might be free to flourish and develop into a new tumor.
But the scientists also proposed a more disturbing explanation: that the emergence of contagious cancer may not be so rare after all. "The possibility," they wrote, "warrants further investigation of the risk that such diseases could arise in humans."
Cancer has probably existed ever since our first multicellular ancestors appeared on Earth hundreds of millions of years ago. The life spans of even the longest-lived animals may be just too brief for cancers to easily evolve the ability to leap to another body. Otherwise, contagious cancer would be everywhere.
For now, at least, it remains a curiosity. Consider the case of a 41-year-old man in Medellin, Colombia, who was examined by doctors in 2013 because of fatigue, fever and weight loss. His lymph nodes were clogged with cancer cells that had also spread to his lungs and liver.
Yet the cells looked far too small and simple to be human. "This case posed a diagnostic conundrum," the doctors wrote in November in The New England Journal of Medicine.
The solution to the puzzle came when the man was also found to be harboring a tapeworm called Hymenolepis nana. Further analysis concluded that the cancer cells had originated in the parasite and then metastasized through the man's body.
There is no reason to think that tapeworm cancer is about to become a threat to public health. The patient's immune system had been compromised by H.I.V., and he died several months later.
But nature is infinite in its surprises.
