The kidney, a vital organ in the urinary system, is responsible for filtering the blood and removing waste from the body. Kidney cancer originates when healthy kidney cells change their DNA and grow uncontrollably, forming a mass called a tumor. If the tumor is not treated, it can grow and invade other parts of the body.
Kidney cancer can significantly affect kidney function and, if not detected and treated early, can spread to other parts of the body (metastasis).
Symptoms of kidney cancer
Recognizing the symptoms of kidney cancer is crucial for early diagnosis and timely treatment. In its early stages, kidney cancer is often asymptomatic, making it difficult to detect. However, as the disease progresses, several symptoms may occur, including:
Blood in the urine (hematuria):
this is often the first sign of kidney cancer and can range from a pinkish color to a deep red.
Pain in the side or back:
a dull, persistent pain in the side, back, or abdomen may be a symptom of kidney cancer.
Weight loss for no apparent reason:
unexplained and significant weight loss can be a warning sign.
Fatigue:
extreme and persistent tiredness that does not improve with rest.
Persistent fever:
a fever that does not go away and is not related to an infection.
Lump in the side or abdomen:
in some cases, a lump or mass can be felt in the kidney area.
It is important to note that the severity and presentation of symptoms can vary significantly from person to person. If you experience any of these symptoms, it is essential to consult a doctor for an assessment.
Classification of kidney cancer
Kidney cancer classification is based on the type of cell in which the cancer originates and helps guide treatment decisions. The most common types are:
Renal cell carcinoma: it is the most common type of kidney cancer. It originates in the lining of the small tubes of the kidney (renal tubules).
Transitional cell carcinoma: this type of cancer originates in the renal pelvis, the part of the kidney that collects urine before it passes into the ureter.
Wilms tumor: it is a rare type of kidney cancer that mainly affects children. It originates in immature kidney cells.
Renal sarcoma: it is a very rare type of kidney cancer that originates in the connective tissues of the kidney.
Each type of kidney cancer has different characteristics and prognoses, so accurate classification is essential for effective treatment.
Causes of kidney cancer
While the exact cause of kidney cancer remains unknown, research has identified several factors that may contribute to the development of the disease. It is believed that the complex interaction between genetic and environmental factors plays an important role.
Identifying risk factors for kidney cancer is crucial for prevention and early detection. Some factors that may increase the likelihood of developing kidney cancer include:
Smoking: smoking increases the risk of kidney cancer.
Obesity: excess weight increases the risk.
High blood pressure: uncontrolled high blood pressure is a risk factor.
Family history: having a close family member with kidney cancer increases the risk.
Chronic kidney disease: people with chronic kidney disease are at higher risk.
Exposure to certain chemicals: exposure to certain substances, such as asbestos and cadmium, can increase the risk.
Modifying modifiable risk factors, such as smoking, obesity, and high blood pressure, can help reduce the risk of developing kidney cancer.
Complications of kidney cancer
Kidney cancer, if left untreated, can lead to various complications that affect the patient’s health and quality of life. Understanding these potential complications is crucial in order to seek timely medical attention and minimize their impact. These complications may include:
Kidney failure: cancer can damage the affected kidney, which can lead to decreased kidney function or even kidney failure.
Metastasis: the cancer can spread to other parts of the body, such as the lungs, bones, liver, and brain. Metastasis can cause a variety of symptoms and complications, depending on the affected area.
Anemia: kidney cancer can cause anemia, which is a decrease in the number of red blood cells. Anemia can cause fatigue, weakness, and shortness of breath.
High blood pressure: cancer can worsen existing high blood pressure or cause new high blood pressure. Uncontrolled high blood pressure can increase the risk of heart disease and stroke.
Stauffer syndrome: this is a rare disorder that causes liver problems in people with kidney cancer, even without liver metastasis.
Hypercalcemia: raised levels of calcium in the blood, which can cause nausea, vomiting, constipation, and confusion.
Diagnosis of kidney cancer
Diagnosing kidney cancer is a process that requires a thorough evaluation by specialists and the use of various techniques. An accurate diagnosis is essential to determine the stage of the disease and plan the most appropriate treatment. The diagnosis of kidney cancer generally begins with a complete medical evaluation, which includes a review of symptoms, medical history, and family history. Subsequently, the following tests and procedures can be performed:
Urine analysis (urinalysis): this test looks for blood in the urine, which can be a sign of kidney cancer. It can also detect other abnormalities in the urine, such as protein or cancer cells.
Blood tests: it looks for the presence of blood (hematuria), a common sign of kidney cancer, although it can also be caused by other conditions. Blood tests assess kidney function, can detect tumor markers, and evaluate the patient’s overall health. Although some tumor markers, such as CA 125, CA 19-9, and CEA, may be elevated in people with kidney cancer, there are no specific markers for this cancer, and therefore caution is needed in their interpretation.
Imaging tests: they are crucial for visualizing the kidneys and detecting the presence of tumors. Renal ultrasound is a noninvasive technique that uses sound waves to create images of the kidneys. It is useful for detecting renal masses and differentiating between cysts (benign) and solid tumors. Computed tomography (CT) provides detailed cross-sectional images of the kidneys and surrounding areas, allowing for the assessment of the size, shape, and location of the tumor, as well as the possible involvement of lymph nodes or other organs. Magnetic resonance imaging (MRI) uses magnetic fields and radio waves to create high-resolution images of the kidneys. It is especially useful for assessing the extent of tumor involvement of the renal vein or the inferior vena cava.
Biopsy: in some cases, a biopsy is performed to obtain a sample of renal tissue and confirm the diagnosis. A biopsy involves the extraction of a small sample of renal tissue for examination under a microscope. The biopsy can be guided by ultrasound or CT to ensure the accuracy of the sample. It is the most accurate method to confirm the diagnosis of kidney cancer and determine the type of cancer.
At HM Hospitales, we have specialized units in hyper-early cancer diagnosis and a team of radiologists who are experts in interpreting imaging tests. https://www.hmhospitales.com/hm-ciocc/prevencion-temprana/We use state-of-the-art technology, such as high-resolution CT and MRI, to obtain accurate and detailed images of the kidneys. Our multidisciplinary approach ensures a comprehensive evaluation and accurate diagnosis of kidney cancer.
Kidney cancer treatment
Treatment for kidney cancer is individualized according to each patient’s needs, taking into account factors such as the stage of the cancer, the patient’s overall health, their preferences, and the availability of resources. The goal of treatment may be curative (to completely eliminate the cancer) or palliative (to relieve symptoms and improve quality of life). Treatment options may include:
Surgery: it is the main treatment for most localized kidney cancers (those that have not spread to other organs). Radical nephrectomy, which involves the removal of the entire kidney, is performed when the tumor is large or advanced. Partial nephrectomy, which preserves most of the healthy kidney, is considered for smaller tumors and in patients with compromised kidney function. At HM Hospitales, we offer Robotic Surgery with the da Vinci system, which allows for minimally invasive surgery with greater precision and a shorter recovery time.https://www.hmhospitales.com/cirugia-robotica/
Targeted therapy: it uses medications that target specific proteins that help cancer grow and spread. These medications can help slow cancer growth and improve survival. They are used in cases of advanced or metastatic kidney cancer. There are different types of targeted therapies, such as tyrosine kinase inhibitors and mTOR inhibitors.
Immunotherapy: it stimulates the patient’s immune system to recognize and destroy cancer cells. Immune checkpoint inhibitors, such as anti-PD-1 and anti-CTLA-4 antibodies, are a type of immunotherapy used in advanced kidney cancer.
Chemotherapy: it uses medications to destroy cancer cells. However, it is used less frequently in kidney cancer compared to other types of cancer. That being said, it may be an option in certain cases.
Radiotherapy: it uses high-energy X-rays to destroy cancer cells. It can be used to treat localized kidney cancer or to relieve the symptoms of metastatic cancer, such as bone pain.
At HM Hospitales, we have a multidisciplinary team of kidney cancer specialists, including urologists, medical oncologists, radiation oncologists, and other healthcare professionals. Our comprehensive and personalized approach ensures that each patient receives the treatment best suited to their needs.
Remember that this article is for informational purposes only and does not replace professional medical advice. If you suspect you have kidney cancer, consult a specialist to obtain an accurate diagnosis and a treatment plan tailored to your needs.
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