Bladder Transitional Cell Carcinoma Stage 0

Stage 0 bladder cancer, non-invasive bladder cancer, superficial bladder cancer, urothelial carcinoma stage 0

Stage 0 bladder cancer is the earliest form of bladder cancer, where cancer cells are found only in the innermost lining of the bladder and have not grown deeper into the bladder wall. When caught at this stage, the cancer is highly treatable, though it has a tendency to come back.

Table of contents

• What is bladder transitional cell carcinoma stage 0?
• Types of stage 0 bladder cancer
• Associated anatomy
• Treatment approaches
• Cancer recurrence and surveillance

What is bladder transitional cell carcinoma stage 0?

Stage 0 bladder cancer refers to the earliest stage of bladder cancer, where cancer cells are found only in the tissue lining the inside of the bladder but have not invaded into the bladder wall^[1]. This type of cancer is also called non-invasive bladder cancer because it has not spread deeper into the layers of the bladder^[2].

Almost all bladder cancers at this stage are urothelial carcinomas, also known as transitional cell carcinomas. These cancers begin in urothelial cells, which are special cells that line the inside of the bladder^[3]. These cells are called “transitional” because they can change shape—they stretch when the bladder fills with urine and shrink when it empties^[4].

Stage 0 bladder cancer is considered highly treatable when detected early. However, one important characteristic of this cancer is that it often comes back after treatment, which means patients need regular follow-up care^[5].

Types of stage 0 bladder cancer

Stage 0 bladder cancer is divided into two distinct types based on how the cancer cells look and grow^[6].

Stage 0a (non-invasive papillary carcinoma) is cancer that looks like long, thin growths extending into the bladder lumen, which is the space where urine collects^[7]. This type of cancer grows on the surface of the bladder lining and can be easily seen during an examination. Stage 0a can be classified as either low grade or high grade, depending on how abnormal the cells appear under a microscope^[8].

Stage 0is (carcinoma in situ) is a flat tumor on the tissue lining the inside of the bladder^[9]. Unlike papillary carcinoma, carcinoma in situ does not form visible growths. Instead, it appears as flat patches of abnormal cells. Stage 0is is always classified as high grade because the cells look very abnormal and are more likely to become invasive bladder cancer if not treated^[10].

Associated anatomy

• Bladder
• Urothelium (bladder lining)
• Bladder lumen

The bladder is a hollow, balloon-shaped organ in the lower part of the abdomen that stores urine^[11]. It has a muscular wall that allows it to expand when it fills with urine and contract to push urine out of the body. The inside of the bladder is lined with a special layer of tissue called the urothelium, which is where stage 0 bladder cancer develops^[12].

Treatment approaches

The standard first treatment for stage 0 bladder cancer is a surgical procedure called transurethral resection (TUR) with fulguration^[13]. During this procedure, a urologist inserts a thin tube with a camera, called a cystoscope, into the bladder through the urethra. The doctor can then remove the cancer tissue through this tube. Sometimes, a second TUR is performed to make sure all the cancer has been removed^[14].

After surgery, most patients receive additional treatment to lower the risk of the cancer coming back. This is called intravesical therapy, which means medicine is placed directly into the bladder^[15]. There are two main types of intravesical therapy:

• Intravesical chemotherapy uses cancer-fighting drugs, most commonly mitomycin or gemcitabine. A single treatment is often given within 24 hours of the TUR surgery^[16].
• Intravesical immunotherapy uses a treatment called BCG (bacillus Calmette-Guérin), which helps the body’s immune system fight cancer cells. BCG is typically given once a week for six weeks^[17].

The choice of treatment depends on whether the cancer is classified as low risk, intermediate risk, or high risk for coming back or becoming more aggressive. For high-risk cancers, BCG therapy may be continued for up to three years to reduce the chance of recurrence. This extended treatment is called maintenance therapy^[18].

In some cases, especially when there are multiple tumors or carcinoma in situ that does not respond to other treatments, surgery to remove part or all of the bladder may be recommended^[19].

Cancer recurrence and surveillance

One of the most important things to understand about stage 0 bladder cancer is that it often comes back after treatment. Studies show that between 50 and 75 percent of patients with non-invasive papillary carcinoma will have the cancer return, though it is usually at the same stage and can be treated successfully again^[20]. Carcinoma in situ is more likely than papillary carcinoma to develop into invasive bladder cancer^[21].

Because of this high rate of recurrence, patients need regular follow-up examinations. This approach is called surveillance^[22]. During surveillance, patients undergo frequent evaluations at regular intervals to detect any new or returning cancer before it becomes invasive. These evaluations typically include:

• Examining urine samples for cancer cells (urinary cytology)
• Direct visualization of the bladder lining using a cystoscope
• These examinations are usually performed every three months

Regular surveillance helps doctors catch any recurrence early when it is most treatable^[23].