No one knows but you can observe your body every day. Do get adequate night time sleep. In the internet, cancer signs shows up in late stage (lose of weight and appetitie and chronic – cough, pain, etc) . Early signs can be skin allergies, heartburn, bloating and back pain.
So, do eat whole foods, exercise, drink clean water, get fresh air and avoid toxins, parasites, molds, fungus, left over foods and do wash your veggies with vinegar water and salt.