According to the things you have mentioned in your query there are no pre-cancerous or cancerous lesions. They just show inflammation.
So you need not be paranoid about cancer. IBS can be temporary and self limiting or chronic and long standing, but IBS is not a severe disease like cancer, it's a common syndrome which can be managed by lifestyle modifications and/or treatment.
Hope this assures you/ answered your query.
Next Steps
If you have more queries or need advise, feel free to consult me on practo.