Which PSA change is concerning for malignancy?

• A. Gradual decrease over years
• B. Sudden doubling from baseline or rapid increase can indicate malignancy
• C. No change over decades
• D. Fluctuating randomly with no trend

Answer: (B)

Rapid PSA rises signal potential cancer because prostate cancer can cause PSA to climb quickly beyond what benign conditions typically produce. PSA levels are influenced by many factors—age, prostatitis, BPH, recent ejaculation—but what matters most is the pattern over time. A sudden doubling from baseline or a rapid increase over a short period is more alarming than small, gradual changes, and it prompts closer evaluation, including repeat testing and possibly imaging or biopsy.

Gradual decreases over years aren’t typical of cancer, since malignancy tends to drive PSA up or at least create an upward trend. No change over decades would be unusually stable and isn’t a reliable indicator of cancer by itself. Fluctuating randomly with no trend can reflect measurement variation or transient factors like infection, rather than a true malignant signal.