Prostate cancer is the second most common cancer affecting men worldwide, with significant health implications when detected early1 . A prostate biopsy is the definitive procedure used to diagnose prostate cancer by collecting tissue samples for microscopic examination2 . Advances in imaging and biopsy techniques have improved the accuracy and safety of prostate biopsies, making them essential in prostate cancer diagnosis and management3 .
Purpose of a Prostate Biopsy
A prostate biopsy is performed to detect the presence of prostate cancer and to assess its aggressiveness. It is usually recommended when initial screening tests, such as elevated prostate-specific antigen (PSA) levels or abnormal findings during a digital rectal exam (DRE), suggest the possibility of cancer1 2. The biopsy helps confirm whether cancer cells are present and provides information on how quickly the cancer might progress, guiding treatment decisions3 .
Patient selection for biopsy is complex and increasingly influenced by prebiopsy imaging, especially multiparametric MRI (mpMRI), which identifies suspicious lesions for targeted sampling4 5. Biopsy remains the gold standard for histologic confirmation of prostate cancer and is critical for risk stratification and treatment planning4 .
Prostate Biopsy Types
Prostate biopsies can be performed using different approaches, each with specific advantages and considerations.
Transrectal Biopsy
The transrectal ultrasound-guided (TRUS) biopsy is the most common method worldwide. It involves inserting an ultrasound probe into the rectum to visualize the prostate and guide a needle through the rectal wall to collect tissue samples6 72. Typically, 10 to 12 cores of prostate tissue are taken systematically from different regions of the gland8 2.
This approach is usually done under local anesthesia and is well tolerated in an outpatient setting9 2. However, because the needle passes through the rectum, there is a higher risk of infection, including urinary tract infections and sepsis10 11.
Transperineal Biopsy
The transperineal biopsy is increasingly becoming the preferred method, especially in Europe and the United States, due to its lower infection risk12 1013. In this technique, the needle is inserted through the skin between the anus and scrotum (the perineum) under ultrasound guidance, avoiding the rectal wall10 2.
This approach allows better sampling of the anterior and transition zones of the prostate, which are often under-sampled in TRUS biopsies13 14. Transperineal biopsy can be performed under local anesthesia in an office setting or under sedation/general anesthesia depending on the clinical scenario10 152.
Other Biopsies
Less commonly, transurethral biopsies are performed using a cystoscope inserted through the urethra to collect tissue samples, but this method is less favored due to invasiveness14 . Saturation or template biopsies, involving more than 12 cores, are used in repeat biopsy cases to improve cancer detection16 .
MRI/ultrasound fusion biopsies combine pre-biopsy MRI imaging with real-time ultrasound guidance to target suspicious lesions, improving detection of clinically significant cancers while potentially reducing the number of cores needed17 65.
Prostate Biopsy Procedure
The prostate biopsy procedure involves preparation before the test, the biopsy itself, and post-test care.
Before the Test/The Pre-Test
Preparation includes evaluating the patient’s medical history, especially medications that affect blood clotting, such as blood thinners, which may need to be stopped several days before the biopsy2 1920. A cleansing enema may be recommended before the procedure to reduce infection risk, particularly for transrectal biopsies2 21.
Prophylactic antibiotics are commonly prescribed to prevent infection, especially with the transrectal approach22 20. Patients may also receive counseling to manage anxiety, which can affect pain perception and overall experience23 .
During the Test
During a transrectal biopsy, the patient lies on their side with knees drawn up, and a lubricated ultrasound probe is inserted into the rectum to image the prostate2 24. Local anesthesia, often a periprostatic nerve block, is administered to numb the area and reduce discomfort25 26. A spring-loaded needle is then used to take multiple tissue samples, usually 10 to 12 cores, from different regions of the prostate2 27.
In a transperineal biopsy, the skin between the scrotum and anus is cleaned and numbed with local anesthesia. An ultrasound probe is inserted into the rectum for guidance, and the biopsy needle is inserted through the perineal skin to collect tissue samples10 2. This procedure may take 20 to 40 minutes and can be performed under local or general anesthesia depending on patient and clinical factors10 2.
MRI/ultrasound fusion biopsies use pre-biopsy MRI images fused with real-time ultrasound to target suspicious lesions, improving cancer detection accuracy17 5.
After the Test/The Post-Test
After the biopsy, patients may experience minor symptoms such as blood in the urine, stool, or semen, which can last from days to weeks11 220. Mild soreness or discomfort in the biopsy area is common2 . Patients are advised to avoid strenuous activities for 24 to 48 hours2 3.
It is important to monitor for signs of infection or complications such as fever, chills, difficulty urinating, or heavy bleeding, and to seek medical attention promptly if these occur2 20. The biopsy tissue samples are sent to a pathologist for examination, with results typically available within one to two weeks3 27.
“A prostate biopsy that is negative for cancer can be very reassuring, but it doesn't mean that you have a 0% risk of having or developing prostate cancer.”
— Justin Gregg, M.D., MD Anderson Cancer Center3
Risks and Precautions
While prostate biopsy is generally safe, it carries some risks and potential complications.
- Infection is the most serious risk, particularly with transrectal biopsy, which may lead to urinary tract infections or sepsis10 11.
- Minor bleeding is common, including blood in urine (hematuria), semen (hematospermia), and rectal bleeding, which usually resolve without intervention11 2.
- Pain or discomfort during and after the procedure can occur but is typically manageable with local anesthesia and nerve blocks25 26.
- Urinary retention (difficulty urinating) is a less common complication but may require medical attention21 .
- The number of biopsy cores taken affects detection rates and complication risks; a 12-core systematic biopsy is standard for initial diagnosis, with additional targeted cores added if suspicious lesions are identified on imaging5 816.
Preparing for a Prostate Biopsy
Proper preparation helps reduce risks and improve patient comfort.
- Inform your healthcare provider about all medications, especially blood thinners, which may need to be paused before the biopsy2 19.
- You may be asked to perform a cleansing enema before the procedure to reduce infection risk, particularly for transrectal biopsy2 21.
- Antibiotics are usually prescribed before and after the biopsy to prevent infection22 20.
- Local anesthesia and nerve blocks are used to minimize pain during the procedure25 26.
- Managing anxiety through education and counseling can improve patient experience and reduce perceived pain23 .
Interpreting Biopsy Results
Interpreting Your Results
The biopsy tissue is examined by a pathologist to determine the presence, location, and grade of any cancer found28 3. Results may be:
Prostate biopsy is essential for confirming prostate cancer diagnosis and determining cancer aggressiveness. Advances in imaging and biopsy techniques have improved detection rates and reduced complications, enhancing patient safety and care13 35.
- Benign: No cancer cells detected.
- Malignant: Cancer cells present, with grading to assess aggressiveness.
- Atypical or suspicious: Abnormal cells that may require further testing or repeat biopsy28 .
The Gleason score or Grade Group is used to grade prostate cancer aggressiveness, ranging from low-grade (Gleason 6) to high-grade (Gleason 8–10) cancers28 3. This grading helps guide treatment decisions.
If the biopsy is negative but clinical suspicion remains high, additional imaging or repeat biopsy may be recommended4 3.
Transperineal biopsy is emerging as the modern gold standard due to its lower infection risk and better access to anterior prostate regions often missed by traditional transrectal biopsy10 1213.
Prostate Biopsy Summary
Prostate biopsy is the definitive diagnostic procedure for prostate cancer, typically performed when screening tests indicate risk4 2. The two main biopsy approaches are transrectal and transperineal, with the latter gaining favor due to lower infection rates and better sampling of certain prostate zones12 1013.
Pre-biopsy mpMRI has improved the accuracy of biopsies by identifying suspicious lesions for targeted sampling5 . The procedure is generally safe, with minor bleeding and discomfort being common, while serious infections are rare but require prompt attention11 15.
Proper preparation, including medication management and antibiotic prophylaxis, helps reduce risks. Pathology results provide critical information on cancer presence and aggressiveness, guiding treatment and follow-up28 3.
