If there is only a small amount of tumour growing over the stent, this can be treated by: â¢ injection of the tumour with alcohol or â¢ burning the tumour to open up the way through again, or â¢ inserting a second stent into the first stent, depending on the location of your cancer.re there any risks in having a stent fitted? Yes, there are possible risks with this procedure and the doctor fitting your stent will discuss these with you in more detail before you have this procedure. The risks include: perforation (making a hole in your oesophagus), bleeding and movement of the stent.