Microbe and human genes influence stomach cancer risk
![](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2014/01/EMpylori_free.jpg?fit=860%2C460&ssl=1)
Strains of Helicobacter pylori that do not evolve along with a population may increase individuals' risk for cancer.
Yutaka Tsutsumi/Wikimedia Commons
Strains of Helicobacter pylori that do not evolve along with a population may increase individuals' risk for cancer.
Yutaka Tsutsumi/Wikimedia Commons