Radical Cystectomy Versus Tri-Modal Therapy for Treatment of cT2N0M0 Urinary Bladder Transitional Cell Carcinoma

Cystectomy, Radiation, Transitional Cell Bladder Cancer

the aim of this study is to compare the oncological outcome of trimodal therapy with bladder preservation using maximal resection with chemoradiation versus the standard radical cystectomy for muscle invasive transitional cell carcinoma of urinary bladder.

Bladder cancer is the 9th most common cancer in the world, accounting for approximately 5-8% of all male cancers which makes it the 4th most common cancer in men and accounts for approximately 2% of female cancers making it the 8th most common cancer among women . Bladder cancer is the 2nd most common urogenital cancer; thus, it is considered a very frequent disease to deal with in urological practice . The urinary bladder is lined internally with transitional epithelial cells (urothelium), followed by lamina propria which is formed of connective tissue supporting the overlying urothelium, then muscularis propria (detrusor muscle) followed by an outer layer called serosa . Bladder cancer is usually presented by gross or microscopic hematuria (85-90%), it may be associated with irritative symptoms, especially in the presence of carcinoma in situ. In advanced disease, the patient may complain of bone pain, loin pain, pain radiating to the buttocks and thighs, or even renal impairment due to obstruction of both lower ureters. Diagnosis and staging of bladder cancer are multimodal approaches done through a combination of clinical, radiological, and histopathological means. Magnetic resonant imaging MRI lacks ionizing radiation, so it is considered a safe way to investigate a patient with cancer bladder before, during, or following up the treatment to determine its response . Diagnostic cystoscopy is the only definitive diagnostic tool through histopathological examination of the resected tissues. Proper sampling should include the underlying muscularis propria. Transurethral resection of bladder tumor (TURBT) can miss proper muscle layer sampling in 25% of invasive cancer leading to under-staging. TURBT depends on the surgeon's experience, so the tumor-free rate varies widely . Differentiation between non-muscle-invasive bladder cancer (NMIBC) and muscle-invasive bladder cancer (MIBC) is a cornerstone in the treatment plans. Treatment methods aim at preserving the quality of life and reduce stage progression. The usual conservative approach in MIBC is a trimodal treatment (TMT). It consists of a transurethral resection of the bladder tumor (TURBT) as complete as possible, followed by concomitant radiotherapy (RT) and chemotherapy (CT). Response to radiotherapy and chemotherapy is then assessed by cystoscopy and biopsies. Planned surgery is proposed to non-responders and additional chemotherapy and RT with careful regular endoscopic examination is performed in responders . Except for the incomplete selective bladder preservation against radical excision (SPARE) trial, there is no large and meaningful randomized trial comparing radical cystectomy and TMT .

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