I have no idea and I thought maybe somebody could help me out here about cancerous cells or cancer cells? My mom has been taking antibiotics for her lung which is producing more and more cancerous cells? She has also had ulcer recently. I have heard of chemotherapy but antibiotics..? She has been taking it for 5 months now she says and I'm upset as I have NO IDEA what is going on and if this is serious or not. It sounds serious if the doctor is putting her on antibiotics for 5 months already.