Tests also showed high levels of specialized immune system cells in their tumors.

测试显示，他们的肿瘤中有高浓度的免疫系统分化细胞。

It begins by attacking the immune system's cells and neutralizing its responses, allowing the virus to proliferate.

病毒首先攻击免疫系统来减弱免疫反应使自身繁殖。

Cancer researchers from the University of Pennsylvania Health System took immune system cells from the blood of the three patients.

美国宾西法尼亚大学医疗体系的癌症研究人员从三名患者的血液中提取了免疫系统细胞。

For a vaccine to work, it needs to teach the immune system's T cells to recognize cancer as dangerous, said Dr. Nora Disis.

诺拉·迪西斯博士说，疫苗要发挥作用，需要教会免疫系统的T细胞识别癌症是危险的。