Prostate(cancer( - Dr Mohan...
Transcript of Prostate(cancer( - Dr Mohan...
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Prostate cancer
Mohan Arianayagam Urologic Oncologist Nepean Hospital
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What is PSA
• 34kDa • Serine protease • Liquefies coagulum to liberate sperm • High concentraCon in seminal fluid • AcCon inhibited in prostate by zinc • Serum half life about 3 days
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Factors lowering PSA
• Obese men • StaCns • 5 alpha reductase inhibitors • TURP, prostatectomy, radiotherapy • LHRH agonist, androgen inhibitors
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5 alpha reductase inhibitors
• finasteride, dutasteride • PSA reduced by 50% at about 12 months • Even low dose (propecia) will reduce PSA • Require PSA levels to be done prior to starCng
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5 alpha reductase and Ca P
• Finsteride vs placebo (PCPT) – Reduced overall risk of prostate cancer – Increased risk of higher grade cancers
• Dutasteride vs placebo (REDUCE) – 23% reducCon in prostate cancers – No increase in higher grade cancers
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Factors that may raise PSA
• Prostate cancer • Benign prostate enlargement • ProstaCCs/UTI • SCmulaCon/ejaculaCon • Prostate massage • TURP/cystoscopy
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PSA and cancer risk
PSA DRE Cancer risk 0-‐2 -‐ 12% 2-‐4 -‐ 15-‐25% 4-‐10 -‐ 50% >10 -‐ 40-‐60% >10 + 70-‐90%
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PSA derivaCves
• Density • Velocity • Isoforms – Free PSA >25% -‐ low risk – (validated for PSA 4 – 10)
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PracCcal approach
• Counsel before ordering PSA • If PSA is within normal range, check annually (&DRE)
• Refer if elevated or rising • If significantly elevated/associated LUTS try anCbioCcs first
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What is screening?
• Test for disease in healthy asymptomaCc populaCons
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What is goal of screening
• Improve overall health by idenCfying and treaCng disease at early stage
• But the treatment may also lead to harm
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Prostate cancer screening trials
• ERPSC trial – Reduced advanced/metastaCc disease and reduced mortality
– To save one life screen 1400 men and treat 48
• PLCO – No difference
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What is the difference
• Localised • Locally advanced • metastaCc
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Symptoms of prostate cancer
• Early/localised – none
• Locally advanced – Urinary symptoms – Ureteric obstrucCon – Haematospermia – ED – Reduced ejaculate volume
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Symptoms of prostate cancer
• MetastaCc – Bone pain – Fractures – Anaemia – Lower extremity oedema – Malignant retroperitoneal fibrosis
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staging
• Determine extent of disease • Helps with prognosCcaCon • Requires – PSA – DRE – Gleason sum – Number of cores posiCve – CT and/or bone scan
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TNM staging • TX Primary tumour cannot be assessed
• T0 No evidence of primary tumour
• T1 Clinically inapparent tumour not palpable or visible by imaging • T1a Tumour incidental histological finding in 5% or less of Cssue resected • T1b Tumour incidental histological finding in more than 5% of Cssue resected • T1c Tumour idenCfied by needle biopsy (e.g. because of elevated prostate-‐specific anCgen [PSA] • level)
• T2 Tumour confined within the prostate • T2a Tumour involves one half of one lobe or less • T2b Tumour involves more than half of one lobe, but not both lobes • T2c Tumour involves both lobes
• T3 Tumour extends through the prostaCc capsule2 • T3a Extracapsular extension (unilateral or bilateral) including microscopic bladder neck • involvement • T3b Tumour invades seminal vesicle(s)
• T4 Tumour is fixed or invades adjacent structures other than seminal vesicles: external sphincter, rectum, levator muscles, and/or pelvic wall
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staging
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staging • N -‐ Regional lymph nodes • NX Regional lymph nodes cannot be assessed • N0 No regional lymph node metastasis • N1 Regional lymph node metastasis
• M -‐ Distant metastasis • MX Distant metastasis cannot be assessed • M0 No distant metastasis • M1 Distant metastasis
– M1a Non-‐regional lymph node(s) – M1b Bone(s) – M1c Other site(s)
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staging
• Clinical staging vs pathological staging
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Grade
• Gleason score – Sum of two most common panerns (grades 1 – 5) – Score is 2 -‐ 10
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Gleason scale
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Gleason 3
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Gleason 4
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Gleason 5
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Risk factors
• Age • GeneCcs – One 1st deg relaCve 2X risk – Two or more 10X risk
• Hereditary prostate cancer – 3 or more relaCves diagnosed before age 53
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When should screening start
• Without risk factors age 50 – annual DRE and PSA
• With risk factors – start at 40 • PSA <1.0 at age 40 can quanCtate risk of CaP in later years
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Diagnosis
• So you’ve decided to have a biopsy….. • Abnormal DRE and/or elevated PSA • School fees
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Before the biopsy
• Ensure PSA is truly elevated • Ie no ejaculaCon, manipulaCon, etc
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Repeat biopsy
• Rising and/or persistently elevated PSA • ASAP with high index of suspicion – Rising PSA – Family history – Abnormal DRE
• SaturaCon biopsy or transperineal
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Transverse view
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Risks of biopsy
• Sepsis • Haematuria • Haematospermia • PR bleeding • pain
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Risk straCficaCon
• low-‐risk (clinical stage T1 to 2a, PSA 10 ng/mL or less and Gleason score 6 or less),
• intermediate-‐risk (stage T2b, PSA greater than 10 but less than 20 ng/mL or Gleason score 7),
• high-‐risk disease (stage T2c, PSA greater than 20 ng/mL or Gleason score 8 to 10)
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What is the difference?
• Prostatectomy for BPH • Radical prostatectomy • TURP
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Treatment opCons
• Radical prostatectomy (the best) • Seed brachytherapy (+/-‐ external boost) • External beam radiotherapy with hormones • Hormones/orchiectomy • High dose rate brachytherapy • HIFU • AcCve surveillance
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Life expectancy over 15 years
• RP • Radiotherapy
• Low risk disease – brachy, AS
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Life expectancy <15 years
• RadiaCon based treatments
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metastaCc
• IniCally hormonal manipulaCon • If hormone refractory – taxotere & other poisons
• Bony lesions are osteoblasCc – may need radiotherapy
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Post surgery
• If posiCve margin – consider adjuvant radiotherapy or just monitoring
• PosiCve lymph nodes – start hormones
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Risks of surgery
• InconCnence • ED • Rectal injury • PSA recurrence – Local – radiotherapy – Distant -‐ hormones
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The trifecta
• Potent • ConCnent • Undetectable PSA
• TorrenCal haemorrhage • Rectal injury • Ureteric injury