As a vegan, it is simple for me to answer that I prefer to eat a plant-based diet. Though the response is simple to make, it and the question lack context, specifically, non-vegans do not all develop cancer, and not all plant-based eaters are cancer free.

Science does suggest that eating a plant-based diet lowers the risk of developing certain cancers:

• Can a vegetarian diet lower cancer risk?

• Could A Vegan Diet Help Prevent Cancer?

• https://www.pcrm.org/health-topi...

As you may note, the specific cancers for which eating a plant-based diet reduced the risk were:

• Breast
• Colorectal
• Prostrate
• Cervical
• Ovarian

As the article below points out, cutting out meat and animal products from the human diet is beneficial to human health, however, it is still possible to eat a non-nutritious (and one that may include carcinogenic ingredients) 100% plant-based diet:

• Becoming a vegetarian - Harvard Health
  

On the other side of the question, the following expert opinion supports the idea that it is possible to eat small amounts of some meats and not increase the risk of developing cancer and other diseases. The article quotes Denis Corpet, Professor of Food Hygiene and Human Nutrition at the University of Toulouse as saying:

“Meat is not carcinogenic, but people eating lots of meat develop cancer more often than those who eat it less. In Europe, twenty percent of people eat more than 80g beef per day, and they are more likely to develop colon cancer than those eating meat rarely. The risk increase is modest, between +20% and +30%. The same risk is observed in people eating more than 50g deli (cured meat) per day.”

• Meat and Cancer: The Carnivore's Conundrum
  

Bottom line: Reducing the consumption of meat and other animal products is supported by science to be a net positive for human health. Assuring that you are enjoying a nutritionally rich and fiber dense diet significantly decreases the likelihood of developing cancer and other diseases.

With all of the above considered, the question that seems relevant is why eat meat at all?

Thank you again for the question and Peace and health to you always.