My mother (she is in her early 60s) has been suffering from recurrent oral cancer for several years now. She has never smoked or drank. She generally tried to ear healhty food and maintained a pretty normal weight. Her test on the high-risk HPV strains came back negative. Yet, what started as white patch/leukoplakia in her mouth, has developed into cancer.

She lives in a pretty old apartment building in New York City. I wonder if there are any other carcinogens that can either cause or contribute to the development of this desease. I read many web sites on the causes of oral cancer. I could not find much information on causes other than smoking, drinking and HPV.

If you have any information or thoughts on that, let me know.

Thank you!