The rise from 1.90 (2009) to 4.8 (2011) may indicate BPH, an inflammation of the prostate (enlargement), which usually causes too much of PSA in the serum. The biopsy will certify what is the cause of the PSA however; you should consider that in some cases the biopsy can miss spots it doesn’t reach.
Other symptoms can help your doctor in ruling a diagnosis, such as: pain, difficult in urinating, frequency, etc., as well as a DRE and your age.
Wait for the results before considering cancer.
Hope for the best. I wish you peace of mind.
Welcome to the board.