Non-Muscle Invasive Bladder Cancer (NMIBC)
The Key Things to Know:
Non-muscle invasive bladder cancer (NMIBC) affects the inner lining of the bladder and has not invaded the bladder muscle. It is often treatable with local (bladder-preserving) therapies, and long-term outcomes are excellent with proper surveillance and follow-up.
What It Is
Bladder cancer begins when abnormal cells grow in the bladder lining. NMIBC includes three main types:
Ta:** Confined to the inner layer
T1:** Grown into the connective tissue beneath the lining but not the muscle
CIS (carcinoma in situ):** Flat, high‑grade, and more aggressive in behaviour
Initial treatment involves Transurethral Resection of Bladder Tumour (TURBT), followed by intravesical (into the bladder) therapy to reduce recurrence.
When It's Needed
Treatment is tailored based on risk category:
Low risk: Single, small, low‑grade tumour – TURBT plus single dose intravesical chemotherapy (e.g. mitomycin)
Intermediate risk: Multiple or recurrent low‑grade tumours – induction and maintenance intravesical therapy
High risk: High‑grade or CIS – induction and maintenance Bacillus Calmette‑Guérin (BCG) therapy, or in selected cases, early cystectomy
Surgery Diagram
Benefits
Organ-preserving treatment in most cases
High survival rates (>95% for low-risk NMIBC)
Outpatient, minimally invasive treatment
BCG therapy reduces recurrence by ≈60%
Risks
Tumour recurrence - 30-70% depending on risk group
Progression to muscle-invasive disease (≈10-20% overall, higher for high-grade tumours)
Irritative urinary symptoms during intravesical therapy
Rare bladder contraction or systemic infection from BCG (<1%)
What to Expect After Treatment
You will have regular cystoscopies (usually every 3-6 months initially) to check for recurrence. Some patients receive a short course of intravesical chemotherapy or immunotherapy after surgery. Mild discomfort and urgency are common after treatments but settle quickly.
FAQs
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Yes - most NMIBC cases are curable with endoscopic and intravesical treatments.
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Because recurrence is common, ongoing cystoscopic surveillance ensures early detection and treatment.
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Recurrences are usually treated with repeat TURBT and/or further bladder instillations.
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