给你两篇英文文章，请找出它们之间共同的单词。


文章1: Scientists have developed a new treatment for cancer that could lead to a cure for the disease. The treatment, called photodynamic therapy, uses lasers and drugs to destroy cancer cells.
文章2: Cancer is a disease that affects millions of people around the world. There are many different types of cancer, each with its own set of symptoms and treatments. Although there is no cure for cancer, there are many treatments available that can help to manage the disease.
The common word between the two articles is "cancer".