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BEST PRACTICE IN PROSTATE
CANCER DIAGNOSIS
Miss Elizabeth Waine
MD FRCS(Urol)Ed
Consultant Urologist
Royal Devon and Exeter NHS Foundation Trust
Overview
• Where we all are now
• Techniques available in places
• What would be the ideal situation
What we all have now
• PSA
• Transrectal ultrasound and prostate biopsy
• MRI of Prostate
• Bone Scan
PSA
• Simple blood test offered to men by their GP
• Indications
• Pts wish to be screened after counseling
• Lower urinary tract symptoms
• Abnormal digital rectal examination
• Bone pain
• Anorexia, weight loss
• Spontaneous DVT
• Sensitivity of 80%, Specificity of 40-50%
• Huge variety of reasons for a raised PSA
PSA variables to help predict prostate
cancer • PSA age specific range
• By using these the sensitivity is improved in younger men but
specificity is improved in older men
• PSA Density
• DSA-D=Total serum PSA /TRUS volume
• If >0.3ng/ml increased likelihood of cancer
• But measuring operator dependent
• PSA Free: total ratio
• Assay availability is low and sample must be delivered to lab fresh
• Prostate cancer more likely if ratio is low that is less free and more
complexed PSA
• Prostatitis can alter ratio
PSA variables to help predict prostate
cancer • PSA velocity
• Requires multiple readings over a 2 year period
• If >0.3ng/ml/yr then increased risk of CaP
• PSA doubling time PSA-DT
• Requires several measurements over 2 years
• PSA-DT < 5 years should trigger further investigation
Trans-rectal ultrasound and Prostate biopsy
• Standard method of achieving tissue diagnosis
• Advantages
• Can be done in the outpatient setting under LA
• Takes 10-20 mins to perform
• Disadvantages
• Complications
• Missed cancers
Sextant Biopsy
Para sagittal plane
Misses 10-30% cancer when patients undergo a second biopsy
10 core biopsy
•Adding 4 lateral biopsies of the peripheral zone:
• Mid & base of prostate
•Presti et al (J Urol 2000): (n=483)
•10 core biopsies (& lesion directed & 6 TZ biopsies)
•Overall 42% had cancer detected
•Sextant detected 80% of the cancers
•Combination of sextant & lateral detected 96% of the cancers
•(4% lesion directed or extra TZ biopsies)
Completing staging investigations
• MRI
• For patients with grade 4
disease
• assessment of lymph
node status
• Assessment of local
disease
• Can have false positive
rate particularly if
performed after prostate
biopsy
• Bone Scan
• Any pattern 4 disease
• PSA>10ng/ml
• Any history to suggest
bone pain
What is available
• PCA-3
• Not yet available on the NHS
• Gives a prediction of prostate cancer which is more accurate when
used in conjunction with PSA, DRE and if possible a F:TPSA
• Patients require a digital rectal examination and a prostatic
massage and then provide a urine specimen the initial catch of this
urine is analysed
• A score is obtained correlating to the probability of a cancer
• Prostate size does not affect PCA3 levels
What is available?
• Multi-parametric MRI
• Scoring system which determines the likelihood of clinically
significant disease
• Combination of standard high resolution T2 weighted MRI with at
least 2 functional MRI techniques.
• Takes 30-45 minutes to acquire the series of imaging depending
upon the indication
Multi-parametric MRI
• Advantages
• Reduces unnecessary biopsies
• Localisation of tumours for improved biopsy yield
• Determine clinically significant tumours
• Disadvantages
• Some false positives can be generated
• Long scan times- claustrophobic patients
• THR and other metallic implants can limit its usefulness
Multi-parametric MRI
• Indications
• Detection of high risk tumours where biopsy high risk/not easy
• For men who have a raised PSA with multiple negative biopsies
• For men with a very high PSA and low grade disease on biopsy
• Planning treatments
• HDR Brachy boost- localisation of tumour
• Surgery- To nerve spare or not?
• Focal therapy mapping
• Categorising patients risk if active surveillance is treatment of
choice
• Ensures no significant peripheral, apical or anterior tumours that have
not been biopsied
MRI Template map
Audit tool
What is available?
• Targeted Biopsy
• Transrectal or Transperineal
• After MRI or with newer USS possible to see the abnormalities
• Send 10 core biopsy and targeted biopsies separately
• Advantages
• Reduces false negative biopsies
• By using MP-MRI target clinically significant lesions
• Disadvantages
• Small lesions are difficult to hit
• Quality of USS images may be insufficient
What do we have available at the RD&E
• MP-MRI
• High suspicion of CaP but normal DRE & who are likely to require
radical treatment
• High risk prostate biopsies
• Patients for AS
• Monitoring AS
• Targeted prostate biopsies
• Transperineal prostate biopsy
The ideal prostate diagnosis pathway
• Patient referred to a one stop service with at least 2 PSA
results
• Have full information about medical history and symptoms
before patient entered hospital doors to enable the
optimum pathway instigated.
• Arrange a pre-biopsy Multi-parametric MRI according to
indications to determine areas for targeted biopsy, if
anterior arrange a trans-perineal prostate biopsy.
• If a candidate for radical treatment appropriate biopsy
and/or stage according to clinical findings, biopsy result,
PSA and co-morbidity can be determined
• Pts with some understanding of the forthcoming process
Thank you