Sorry to hear about this. It's not normal for procedures to be canceled, but it certainly can happen.
It's difficult to work out where he is in terms of diagnosis and treatment from what you've said, or what the .3 and .4 refer to (PSA, gleason, stage, etc)?
It would help to give you a good answer if you could create a bio in your profile with dates of test results such as PSA level, biopsies (and if transrectal or template), scans, etc. and any procedures/drugs, so we can see what tests he's had, and what the outcomes were. Click on my avatar for an example. Then we can give you better advice targeted at his situation. We can give you lots of support and advice here, but it helps to know more precisely what stage in the process your partner is. If there are any of the tests or results you don't understand, do say, and we can explain.
Also, does he have a Macmillan nurse or specialist urology/oncology nurse assigned to him? They can be really good to contact when you don't understand something or when you want to chase something up. Often in the consulting room you are given a lot of info and don't have the time to take it all in, or didn't ask questions you thought of later. You can approach his assigned nurse and have them explain again, or you can ask here, but we obviously don't have his medical records to look back over.