Wilms tumor

Wilms tumor or Nephroblastoma is a kidney cancer that is very common in children and mostly in children who are below 5 years of age. It is a kidney pediatric cancer that is the most prevalent. Wilms tumor is known to develop in one kidney although in few cases; it develops in both kidneys.

Wilms Tumor Symptoms

The Wilms Tumor Symptoms may be different depending on the size of the tumor and the extent of its spread, however, in many cases, the symptoms may be insidious. Here are the main symptoms:

Abdominal Signs

• Abdominal distention or a mass: The initial symptom that is often noticed; painless in the majority of cases.
• Abdominal pain or discomfort: It may develop with the growth of the tumor.
• Abdominal fullness or pressure.

Urinary Signs

• Blood in the urine (hematuria): Uncommon, but possible.
• Urinary alterations: Less frequent, can be difficulty or frequency.

Systemic Symptoms

• Fever without infection.
• Anorexia or anorexia nervosa.
• Fatigue or malaise.

Blood Pressure Changes

• High blood pressure (hypertension): It is present in a few cases due to the fact that the tumor influences the functioning of the kidney.

Rare Signs

• Obstruction in case the tumor is lying against the intestines.
• Edema of the legs, or peripeteal eyes (in case kidney functioning is disrupted).

Wilms Tumor Causes

Causes of Wilms Tumor are not known with certainty, but most likely are linked to genetic and developmental causes. Here’s a detailed breakdown:

Genetic Mutations

• Uncontrolled increase of kidney cell can be caused by mutations in some genes.
• WT1 gene: The most prevalent gene; controls kidney development.
• WT2 gene: Rare, and also associated with Wilms tumor.

Congenital Syndromes

Wilms tumor is more likely to develop in children with the following syndromes:

• WAGR syndrome: It consists of Wilms tumor, Aniridia (abnormality of the eyes), Genitourinary malformation, and intellectual disability.
• Denys-Drash syndrome: It is a kidney disease, abnormality of male genitals, and Wilms tumor.
• Beckwith-Wiedemann syndrome: This predisposes overgrowth and risk of tumor.

Kidney Developmental Abnormality

• Wilms tumor occurs due to the failure of the cells (nephogenic rests) in the kidney to mature as a result of fetal development.
• These remaining cells have the potential of developing into a tumor during early childhood years.

Family History

• Wilms tumor is rarely hereditary and thus can occur in families as a result of inherited genetic mutations.

Environmental Factors

• There is no serious evidence to associate Wilms tumor with environment and lifestyle conditions; it is mostly genetic and developmental.

Wilms Tumor Diagnosis

The Diagnosis of Wilms Tumor is determined by a combination of physical examination, imaging, and laboratory tests and in some cases biopsy to determine the presence, size and extent of the tumor. Here’s a detailed breakdown:

Physical Examination

• Abdomen palpation: It is common to find the painless lump or swelling that doctors noted in the abdomen of the child.
• Blood pressure measurement: Sometimes it can be a sign of high blood pressure.
• General health: The observer is examining the patient in terms of fatigue, fever, or weight loss.

Imaging Tests

These are essential in order to visualize the tumor and ascertain whether it has metastasized:

• Ultrasound First-line imaging to reveal kidney masses.
• CT Scan (Computed Tomography): Gives a detailed image of the tumor and the surrounding organs.
• MRI (Magnetic Resonance Imaging): Assists in assessing the involvement of the soft tissues and the involvement of blood vessels.
• Chest X-ray or CT: To ensure that it has not spread to the lungs, this is a frequent metastasis site.

Laboratory Tests

• Blood tests: To test kidney, electrolytes, and general health.
• Urine tests: To identify the presence of blood or any other abnormality.

Biopsy

• Not performed as a routine practice prior to surgery in Wilms tumor since there is a risk of transferring cancerous cells.
• In some cases, a needle biopsy can be performed in case the diagnosis is not clear.

Staging and Genetic Testing

• Staging: Once the tumor has been imaged, it is staged according to the size, spread and involvement of the lymph nodes.
• Genetic testing: Could be requested when a child has a syndrome, such as WAGR, Denys-Drash, or Beckwith-Wiedemann to detect mutations.

Wilms Tumor Treatment

The Treatment of Wilms Tumor is based on the level of the tumor, age of a child, general health conditions, and possibility of cancer spreading. It is normally treated by a combination of surgery, chemotherapy and in some cases radiation.

Surgery

• Nephectomy (removal of kidney): This is the most usual treatment.
• Radical nephectomy: This is a procedure where the entire affected kidney is removed together with the surrounding tissue and lymph nodes.
• Partial nephrectomy: Removes only the tumor in case the kidneys are both affected or to preserve the functioning of the kidney.
• Localized tumors are usually treated by surgery, although chemotherapy can be used before surgery to reduce the size of the tumor.

Chemotherapy

• Takes drugs to kill or stop the growth of cancerous cells.
• May be administered prior to operation (neoadjuvant) to debulke huge tumors or following operation (adjuvant) to minimize the chances of recurrence.
• The usual medications are dactinomycin, vincristine and doxorubicin.

Radiation Therapy

• Kills remaining cancer cells by use of high-energy rays.

Typically used in:

• Metastatic tumors outside the kidney.
• Big tumors or ones that were not taken out completely.
• Recurring tumors

Targeted Therapy / Clinical Trials

• Uncommon, but few children can be accessing therapies or experimental treatment as part of clinical trials.

Follow-up Care

• Frequent imaging and blood examinations to check recurrence.
• Functional monitoring of the kidney in case of one of the parts or of both kidneys was involved.
• Prophylactic care to cope up with the side effects of chemotherapy or radiations.

Wilms Tumor Surgery

Wilms Tumor Surgery is a major component of the treatment and would normally entail the removal of the affected kidney and the surrounding tissue to remove the cancer. The nature of the surgical operation will depend on the size, the location of the tumor and the involvement of both kidneys.

Types of Surgery:

Radical Nephrectomy (Most Common)

• Amputates the whole affected kidney, the surrounding fatty tissue, and lymph nodes.
• It is often done on tumors that are limited to the kidney.
• Purpose: To eradicate the tumor, thus preventing recurrence.

Nephron-Sparing Surgery (Partial Nephrectomy)

• The tumor and a small part of kidney tissue are only removed.

Considered when:

• Tumors are small or
• The conditions affect both kidneys and therefore it is important to save the kidney functions.

Chemotherapy

• Chemotherapy before surgery is performed in certain cases in order to reduce the size of large tumors, which reduce the risks associated with surgery and increase its effectiveness.

Surgical Procedure Steps

• Anaesthesia: The child is put on the general anaesthesia.
• Incision: A slash is accelerated on the stomach in order to reach the kidney.
• Tumor removal: The kidney or tumor is removed very carefully in order not to rupture it.
• Removal of lymph nodes: The lymph nodes in the area could be removed to investigate the cancer spread.
• Closure: The wound is stitched, and the drains might be added in case of necessity.

Recovery

• Hospitalization: 5 to 10 days, depending on the healing process and complications.
• The control of pain, prevention of infections, and kidney monitoring.
• Majority of children are able to go back to normal activities in 2-4 weeks.

Wilms Tumor in Children

The most prevalent kidney cancer in children is Wilms Tumor that normally occurs in children under the age of 5 years. It is a result of immature kidney cells (nephrogenic rests) which do not mature in the process of fetal development.

Key Facts

• Incidence: About 1 in 10,000 children.
• Age: The majority of cases are diagnosed at the age of 2-5.
• Gender: It is a little more prevalent in girls than boys.
• Kidney Affected: It is typically one kidney, but occasionally both.

Conclusion

Nephroblastoma, which is also known as Wilms tumor, is a relatively uncommon but the most prevalent type of kidney cancer in young children, mostly occurring among those at the age of less than 5 years. It is formed as a result of immature kidney cells that do not mature and may be related to genetic mutation or congenital syndromes. The abdominal swelling/lumps may be detected early, but other symptoms such as abdominal pain, fever, blood in urine or high blood pressure can occur. Diagnosis is based on physical examination, radiography (ultrasound, CT, MRI), laboratory tests, and occasionally genetic research. The usual treatment includes surgery (nephrectomy), chemotherapy, and sometimes radiotherapy, the treatment plans are provided according to the tumor stage, location, and health of the child in general. Early diagnosis and treatment in most cases mean a good prognosis where survival rates have been recorded at higher levels of 90 percent in localized cases.

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FAQ

1. What is Wilms tumor?

• Wilms tumor, also known as nephroblastoma, is a cancer in the kidneys, which mostly develops among children below the age of 5, due to the proliferation of immature cells of the kidney.

2. What causes Wilms tumor?

• Its precise etiology is unclear, although it is associated with genetic mutations, congenital syndromes (WAGR, Denys-Drash, Beckwith-Wiedemann), and dysdevelopment of the kidney.

3. What is the prognosis?

• When localized Wilms tumor is detected early and treated, treatment has a higher chance of survival, rated at more than 90 percent.

4. Is there a possibility of Wilms tumor in both kidneys?

• It normally targets one of the kidneys, but in rare cases, both kidneys may be targeted. Partial nephectomy can also be done in such issues to save kidney functioning.

5. Is Wilms tumor hereditary?

• The majority of the cases do not get inherited, although a minor percentage is linked to genetic mutations in the family.