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Medically Approved by Dr Aqua Asif (12/5/2025) and Mr Tim Dudderidge Consultant urologist GMC: 4505451 (24/3/2026)

Written by FTC Medical team 

At a Glance 

Prostate cancer is staged from 1 to 4 using the TNM system, Gleason grading, and PSA levels. Most men are diagnosed at an early stage (Stage 1 or 2), where the cancer is confined to the prostate and the five-year survival rate approaches 100%. For men with localised, early-stage prostate cancer, focal therapy — including NICE-approved HIFU (IPG424) and NanoKnife IRE (IPG768) — can treat the tumour while preserving sexual function in 90%+ of cases (FTC audit, n=265).

Key takeaways:

  • Four numbered stages — Stage 1 (confined, often no symptoms) through Stage 4 (spread beyond the prostate to bones or organs)
  • TNM plus Gleason grading — staging combines tumour size (T), lymph node status (N), distant spread (M), and how aggressive the cells appear under a microscope
  • Early stages are highly treatable — five-year survival for Stage 1–2 is near 100%, with treatment options including active surveillance, focal therapy, surgery, and radiotherapy
  • Focal therapy for localised disease — HIFU and NanoKnife IRE target the tumour only, with 97% urinary continence and 90%+ sexual function preservation (FTC audit, n=265)
  • Staging guides your treatment pathway — your consultant uses your stage, grade, and PSA to recommend the most appropriate treatment for your specific situation

If you have been diagnosed with prostate cancer, one of the first things your consultant will explain is the stage — how far the cancer has progressed and what it means for your treatment options. The good news is that the majority of prostate cancers are diagnosed at an early stage, when treatment is highly effective and a wide range of options are available.

At The Focal Therapy Clinic, our consultant urological surgeons use detailed staging information alongside mpMRI and targeted biopsy results to recommend the most appropriate treatment for each patient. For men with localised, early-stage prostate cancer, focal therapy — including NICE-approved HIFU (IPG424) and NanoKnife IRE (IPG768) — offers cancer control with significantly fewer side effects than radical surgery or radiotherapy.

 

How Is Prostate Cancer Staged?

Prostate cancer staging describes how large the tumour is, whether it has spread to lymph nodes, and whether it has metastasised to other parts of the body. Two main systems are used — the TNM staging system and the number staging system (Stages 1–4) — alongside Gleason grading and PSA levels. Together, these determine which treatment options are most appropriate, as outlined in NICE guideline NG131.

TNM Staging System

The TNM system classifies cancer by Tumour size (T), lymph Node involvement (N), and Metastasis (M). Each element is given a number to represent how advanced the cancer is.

Tumour (T) — Size and Extent

T Stage Description Focal Therapy Suitability
T1 Tumour too small to be felt on digital rectal examination (DRE) or seen on standard imaging. Often found incidentally. Potentially suitable — assessment required
T2a Tumour in half of one lobe of the prostate or less. Often suitable for focal therapy
T2b Tumour in more than half of one lobe, but not both. May be suitable — individual assessment
T2c Tumour in both lobes of the prostate. May be suitable — individual assessment
T3a Tumour has grown through the prostate capsule on one or both sides. Focal therapy less likely — other options preferred
T3b Tumour has grown into the seminal vesicles. Not typically suitable for focal therapy
T4 Tumour has spread to nearby organs (bladder, rectum, or pelvic wall). Not suitable for focal therapy

Focal therapy suitability depends on multiple factors including tumour grade, PSA, and MRI findings. At The Focal Therapy Clinic, our consultants assess each patient individually using mpMRI and targeted biopsy results.

Nodes (N) — Lymph Node Involvement

  • N0 — the cancer has not spread to any nearby lymph nodes
  • N1 — the cancer has spread to nearby lymph nodes in the pelvis

Metastasis (M) — Distant Spread

  • M0 — the cancer has not spread to distant sites
  • M1a — spread to lymph nodes beyond the pelvis
  • M1b — spread to bones
  • M1c — spread to other organs (e.g. liver, lungs)

Number Staging System (Stages 1–4)

The number staging system groups prostate cancer into four stages based on tumour size, lymph node involvement, distant spread, Gleason grade, and PSA level. It is used alongside the TNM system to guide treatment decisions.

Stage What It Means Treatment Options Five-Year Survival
Stage 1 Cancer confined within the prostate; small, low grade (Grade Group 1), PSA below 10. Often found via PSA testing. Most men have no symptoms. Active surveillance, focal therapy (HIFU or NanoKnife), surgery, radiotherapy Near 100% (Cancer Research UK)
Stage 2 Cancer still confined to the prostate but may be larger or involve more of the gland (T2b–T2c). PSA may be 10–20. Few or no symptoms. Active surveillance, focal therapy, surgery, radiotherapy, radiotherapy plus hormone therapy Near 100% (Cancer Research UK)
Stage 3 Cancer has grown beyond the prostate capsule or into the seminal vesicles (T3). Lymph nodes typically unaffected. Some men notice urinary symptoms. Surgery (often with lymph node dissection), radiotherapy plus hormone therapy. Focal therapy less commonly recommended. Approximately 95% (Cancer Research UK)
Stage 4 Cancer has spread to nearby lymph nodes (IVA) or distant sites such as bones or organs (IVB). Symptoms may include bone pain and fatigue. Hormone therapy, chemotherapy, targeted therapy, radiotherapy, palliative care Varies significantly by extent of spread

Source: staging definitions based on AJCC 8th edition; survival figures from Cancer Research UK.

Focal Therapy for Stage 1 and Stage 2 Prostate Cancer

For men diagnosed with localised prostate cancer (Stage 1 or Stage 2), focal therapy treats only the cancerous tissue within the prostate, preserving the surrounding healthy structures. At The Focal Therapy Clinic, our consultants offer two NICE-approved focal therapy options:

  • HIFU (High-Intensity Focused Ultrasound) — approved under NICE IPG424, uses focused ultrasound energy to destroy the tumour
  • NanoKnife IRE (Irreversible Electroporation) — approved under NICE IPG768, uses electrical pulses to destroy cancer cells while preserving surrounding tissue structures

In our clinic’s experience treating over 2,000 patients, focal therapy achieves 90%+ sexual function preservation and 97% urinary continence (FTC audit, n=265). Most patients return home the same day and 85% are back to work within two weeks.

“Not every patient is suitable for focal therapy, and we’re transparent about that. We assess every referral carefully with mpMRI and targeted biopsy before recommending treatment.”

What Does the Gleason Score Mean?

The Gleason score indicates how aggressive prostate cancer cells appear under a microscope, and it plays a key role in determining which treatments are most appropriate. Lower Gleason scores (6) indicate slow-growing cancer that may be suitable for active surveillance or focal therapy, while higher scores (8–10) indicate more aggressive disease that typically requires radical treatment.

Gleason Score and Grade Groups

Pathologists grade two areas of the tumour on a scale from 3 to 5 and add them together to give the Gleason score. A newer system — the Grade Group — simplifies this into five categories:

Grade Group Gleason Score What It Means Typical Treatment Options
Grade Group 1 6 (3+3) Low grade — cells look close to normal; slow-growing Active surveillance, focal therapy
Grade Group 2 7 (3+4) Intermediate — predominantly well-formed glands with some poorly formed Focal therapy, surgery, radiotherapy
Grade Group 3 7 (4+3) Intermediate — predominantly poorly formed glands Surgery, radiotherapy ± hormone therapy; focal therapy in selected cases
Grade Group 4 8 High grade — few recognisable glands Surgery, radiotherapy plus hormone therapy
Grade Group 5 9–10 Very high grade — very aggressive disease Multimodal treatment (surgery, radiotherapy, hormone therapy, chemotherapy)

At The Focal Therapy Clinic, men with Grade Group 1 or 2 prostate cancer confined to the prostate are often good candidates for focal therapy. In our audit of 265 patients treated with focal therapy, 90% remained cancer-free at one year, with 97% maintaining full urinary continence and 90%+ preserving sexual function.

What Are the Cambridge Prognostic Groups (CPGs)?

In the UK, clinicians commonly use Cambridge Prognostic Groups (CPGs) to classify prostate cancer risk. CPGs combine the tumour stage, Gleason grade, and PSA level into a single risk category that guides treatment recommendations, as outlined in NICE guideline NG131.

CPG Risk Level Typical Profile Treatment Options
CPG 1 Low Gleason 6 (Grade Group 1), PSA below 10, T1–T2a Active surveillance, focal therapy (HIFU/NanoKnife)
CPG 2 Favourable intermediate Gleason 3+4 (Grade Group 2), PSA 10–20, T1–T2b Focal therapy, surgery, radiotherapy, active surveillance
CPG 3 Unfavourable intermediate Gleason 4+3 (Grade Group 3), higher PSA Surgery, radiotherapy ± hormone therapy; focal therapy in selected cases
CPG 4 High Gleason 8 (Grade Group 4) or T3 Surgery plus radiotherapy, radiotherapy plus hormone therapy
CPG 5 Very high Gleason 9–10 (Grade Group 5) or T4 Multimodal treatment (surgery, radiotherapy, hormone therapy, chemotherapy)

Men in CPG 1 and CPG 2 are often strong candidates for focal therapy at The Focal Therapy Clinic. Our medical suitability assessment includes detailed mpMRI review and targeted biopsy to confirm whether focal therapy is appropriate for your specific situation.

 

Frequently Asked Questions

What are the 4 stages of prostate cancer?

Prostate cancer is staged from 1 to 4 using the TNM system alongside Gleason grading and PSA levels. Stage 1 is the earliest — the cancer is small, low grade, and confined within the prostate. Stage 2 means the cancer is still organ-confined but may be larger. Stage 3 indicates the cancer has grown beyond the prostate capsule. Stage 4 means the cancer has spread to lymph nodes or distant sites such as bones. The vast majority of men are diagnosed at Stage 1 or 2, when the cancer is highly treatable with options including active surveillance, focal therapy, surgery, or radiotherapy.

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    What are the symptoms of stage 2 prostate cancer?

    Most men with Stage 2 prostate cancer have no noticeable symptoms. The cancer is still contained within the prostate gland and is typically detected through PSA testing or MRI rather than symptoms. Some men may experience urinary changes such as a weak stream or increased frequency, although these symptoms are much more commonly caused by benign prostatic hyperplasia (BPH), a non-cancerous enlargement of the prostate.

    What is the life expectancy of a person with prostate cancer?

    Life expectancy depends on the stage and grade of the cancer, the man’s age and overall health, and the treatment received. For early-stage prostate cancer (Stage 1 and 2), the five-year survival rate is near 100% according to Cancer Research UK. Even Stage 3 prostate cancer has an approximately 95% five-year survival rate. For men with localised disease treated with focal therapy at The Focal Therapy Clinic, our audit of 265 patients shows 90% remain cancer-free at one year.

    What is the prognosis of stage 4 prostate cancer?

    The prognosis for Stage 4 prostate cancer varies significantly depending on the extent of spread and response to treatment. Stage 4A (spread to nearby lymph nodes only) generally has a better outlook than Stage 4B (distant spread to bones or organs). Modern treatments — including hormone therapy, chemotherapy, targeted therapies, and radiotherapy — mean that many men live for years with advanced prostate cancer. Your oncologist will discuss the most appropriate treatment plan based on your specific circumstances.

    References

    1. Cancer Research UK. (n.d.). Prostate cancer stages. Retrieved from https://www.cancerresearchuk.org/about-cancer/prostate-cancer/stages
    2. Prostate Cancer UK. (n.d.). Just diagnosed. Retrieved from https://prostatecanceruk.org/prostate-information-and-support/just-diagnosed 

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