28.04.2013 Views

MDT (multi-disciplinary team) guidance for managing prostate cancer

MDT (multi-disciplinary team) guidance for managing prostate cancer

MDT (multi-disciplinary team) guidance for managing prostate cancer

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

Prostate size – a benignly enlarged gland can influence PSA concentrations.<br />

Infection – elevated PSA levels can be seen beyond 6 months in up to 50% of patients when associated<br />

with febrile urinary tract infections.<br />

Free and complexed PSA should be understood. Catalona et al. conclude that percentage free PSA<br />

is most useful in men with a PSA concentration in the range 2−15 ng/ml (Table 3); the higher the<br />

percentage of free PSA the lower the probability of <strong>cancer</strong>. 23<br />

Table 3: Probability of <strong>prostate</strong> <strong>cancer</strong> based on total and percentage free PSA 23<br />

Total PSA (ng/ml)<br />

PSA density i.e. PSA level (ng/ml)<br />

TRUS-determined <strong>prostate</strong> volume (ml)<br />

Probability of <strong>cancer</strong> (%)<br />

0−2 ~1<br />

2−4 15<br />

4−10 25<br />

>10 >50<br />

Free PSA (%)<br />

0−10 56<br />

10−15 28<br />

15−20 20<br />

20−25 16<br />

>25 8<br />

May be helpful in differentiating BPH from <strong>prostate</strong> <strong>cancer</strong> in patients who have a normal DRE with<br />

a PSA 4−10ng/ml. A PSA density >0.15 may suggest <strong>prostate</strong> <strong>cancer</strong>.<br />

PSA velocity can be valuable in the follow-up of men with a normal PSA but prior negative biopsies.<br />

Velocity is measured by a change in PSA concentration in three consecutive measurements taken at<br />

6-monthly intervals. A change in PSA concentration of >0.75 ng/ml per year is more likely to indicate<br />

<strong>prostate</strong> <strong>cancer</strong> than BPH. The usefulness of PSA velocity in those with a PSA concentration >10 ng/ml<br />

is unknown. 24<br />

TRUS<br />

• TRUS detects 50% more patients with <strong>prostate</strong> <strong>cancer</strong> than physical examination alone, 25, 26 but<br />

the ultrasonic appearance of <strong>prostate</strong> <strong>cancer</strong> is variable and only a very small number of <strong>cancer</strong>s<br />

are detected if a DRE and PSA test are normal. 26−28 There<strong>for</strong>e, TRUS is mainly used to aid biopsy.<br />

15

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!