给出以下话题（两分钟以内英语topic）：肿瘤的发生与环境因素更相关还是遗传因素

Today, I'd like to talk about whether the occurrence of tumors is more closely related to environmental factors or genetic factors. Cancer is a disease that affects millions of people worldwide and is caused by abnormal cell growth in the body. There are many factors that can contribute to the development of cancer, including lifestyle choices, exposure to toxic substances, and genetic predisposition. While genetics certainly play a role in cancer development, evidence suggests that environmental factors, such as exposure to carcinogens and unhealthy lifestyle choices, are the primary drivers of tumor growth. Studies have shown that individuals who smoke, eat a poor diet, or are exposed to radiation or pollution are at a higher risk of developing cancer than those who do not. Additionally, cancer rates vary widely between different regions and countries, further supporting the idea that environmental factors are a major contributor to the disease. While genetic testing can provide valuable information about an individual's risk of developing cancer, it is important to focus on prevention by promoting healthy lifestyles and reducing exposure to environmental toxins.