Latest research: Dog infectious cancer cells have survived for more than ten thousand years

Scientists have discovered in dogs that a contagious cancer cell has survived for nearly 11,000 years and is currently the "longest-lived" cancer cell. Puppies like to smell and lick around the world, but this is easy to get sick. One of the most common and highly contagious is reproductive tract tumors, which are transmitted through mating and licking sick dogs. When did this infectious cancer begin to spread among dogs? Scientists looked for the answers from two infected puppies, sorted their cancer cells as genes, and traced the origins. They found that the cancer cells in the two dogs had survived for more than 11,000 years. I believe it comes from a Mesolithic, sled dog-like dog, and it is also estimated that it is the first dog to suffer from reproductive tract tumors.

Unlike general cancer, the cancer cells of this dog did not disappear with the death of the host. Instead, they mate through the dog and spread to other dogs, and then transmitted from one group of dogs to another group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs, one group of dogs During this period, it experienced nearly two million gene mutations, from spreading only in a single dog, to infecting dogs around the world on a large scale nearly five hundred years ago.

Today, it can be found in two puppies living in Brazil and Australia respectively, becoming the "longest-standing" cancer cells found.

Scientists can even infer that the first generation of infected dogs, from in-mating dogs, have straight short hairs in gray brown or black, but cannot determine their gender.

Reproductive tract tumors can also be found in dog lymph and eye clearance, and are one of the two known infectious cancers. Another type is the facial tumor of the Tasmanian devil, which is transmitted through bites.

Although there are not many cancers that can be transmitted, experts remind that cancer cells in humans or other animals have the opportunity to change. This study will help understand the relationship between cancer cell mutations and infectivity.