Absolutely nothing to worry about.
You have a hemoglobin of 12 which is pretty good.
PCV changes based on your water intake on a daily basis so it can be slightly high or low every now and then.
I can say with 100% assurance that there is no correlation with cancer here.
If you are worried about
kidney disease, you can simply check your renal function test ( if it wasn't already done )
Next Steps
A balanced diet adequate in fruits, vegetables and good protein sources
regular exercise ( 30 mins a day for 5 days a week)