What is Kidney Cancer?
Kidney cancer, medically known as renal cell carcinoma (RCC), occurs when abnormal cells in the kidney begin to grow uncontrollably, forming a malignant tumor. While some kidney masses are benign, RCC is the most common type of kidney cancer in adults, accounting for approximately 90% of all kidney malignancies.
Kidney cancer is more frequently diagnosed in men than women and typically affects individuals between the ages of 60 and 70. Early detection increases the chances of successful treatment and long-term survival.
What Do Kidneys Do?
The kidneys are two bean-shaped organs located on either side of the spine, just below the rib cage. They play several vital roles in the body:
- Filtering waste products from the blood
- Producing urine to excrete waste
- Regulating blood pressure via hormone production
- Balancing electrolytes and fluids
- Stimulating red blood cell production through erythropoietin
- Contributing to bone health by managing calcium and phosphorus levels
Because the kidneys have such diverse and essential functions, tumors in this area can affect the body in multiple ways.
Risk Factors for Kidney Cancer
Kidney cancer can develop in anyone, but certain environmental, genetic, and lifestyle factors can significantly increase your risk. Understanding these risk factors can help with early detection and prevention, especially in individuals with multiple contributing elements. Below are the most well-established risk factors associated with renal cell carcinoma (RCC), the most common form of kidney cancer in adults:
- Smoking
Cigarette smoking is one of the most well-documented risk factors for kidney cancer. Smokers are estimated to have nearly double the risk of developing RCC compared to non-smokers. Harmful chemicals inhaled during smoking are filtered through the kidneys, potentially damaging renal tissues over time and promoting carcinogenic changes at the cellular level. The risk increases with the number of cigarettes smoked and duration of smoking, but can be reduced by quitting.
- Obesity
Excess body weight is a major modifiable risk factor for kidney cancer. Obesity is associated with chronic low-grade inflammation, insulin resistance, and elevated levels of certain hormones (such as insulin-like growth factor and estrogen), all of which may contribute to abnormal cell growth in kidney tissues. Studies suggest that higher body mass index (BMI) correlates with increased RCC risk in both men and women.
- High Blood Pressure (Hypertension)
Long-standing hypertension—even when controlled with medication—has been linked to a higher risk of kidney cancer. The mechanisms are not entirely clear, but it is believed that increased pressure in renal blood vessels may lead to cellular damage and inflammation, setting the stage for cancer development. Additionally, certain antihypertensive drugs may contribute to risk, although this remains under investigation.
- Family History and Inherited Genetic Conditions
Individuals with a first-degree relative (parent, sibling, or child) who has had kidney cancer are at increased risk. In some cases, this may be due to shared environmental factors, but hereditary syndromes can also play a role. These include:
- Von Hippel-Lindau (VHL) syndrome
- Hereditary papillary renal cell carcinoma
- Birt-Hogg-Dubé syndrome
- Tuberous sclerosis complex
If there is a strong family history, genetic counseling and testing may be recommended to evaluate personal risk.
- Chronic Kidney Disease and Dialysis
Patients with chronic kidney disease (CKD) or those who have undergone long-term dialysis (usually more than 3–5 years) are at significantly higher risk of developing RCC, particularly a rare subtype called acquired cystic disease-associated RCC. The exact mechanism is unclear, but prolonged kidney dysfunction, toxic waste buildup, and cyst formation may all contribute.
- Occupational and Environmental Exposures
Exposure to certain industrial chemicals and carcinogens has been linked to kidney cancer. These include:
- Cadmium (used in batteries and welding)
- Asbestos (formerly used in construction)
- Trichloroethylene (a degreasing solvent)
- Herbicides and pesticides (used in agriculture and landscaping) Workers in the petrochemical, metalworking, rubber, and textile industries may have an elevated risk due to long-term contact with these substances.
- Male Gender and Age
Kidney cancer is twice as common in men as in women, although the reasons for this are not fully understood. Hormonal differences, smoking rates, and occupational exposures may play a role. The majority of cases occur in individuals over the age of 60, making age a strong non-modifiable risk factor.
- Certain Medications and Medical Conditions
Long-term use of certain pain-relieving drugs (especially non-aspirin NSAIDs and phenacetin-containing medications, now banned in many countries) has been linked to a higher incidence of kidney cancer. Additionally, patients with medical conditions such as diabetes
Symptoms of Kidney Cancer
Kidney cancer often does not cause symptoms in its early stages. However, as the tumor grows, signs may begin to appear:
- Blood in the urine (hematuria) – May appear pink, red, or cola-colored
- Persistent pain in the side or lower back
- Abdominal mass or lump that can be felt
- Unexplained weight loss
- Fatigue or low energy
- Fever not caused by infection
- Anemia or high blood pressure (secondary effects)
Note: These symptoms may also be associated with other, non-cancerous conditions. Always consult a healthcare provider if you notice these signs.
How is Kidney Cancer Diagnosed?
Diagnosing kidney cancer typically involves a series of tests:
- Imaging tests –
- Ultrasound: Detects mass presence
- CT scan/MRI: Determines tumor size, spread, and vascular involvement
- Blood and urine tests – Assess kidney function and detect abnormalities
- Renal biopsy – In specific cases, a needle is used to extract tissue for pathological examination
Kidney tumors are often found incidentally during scans for unrelated issues, which highlights the importance of routine health evaluations.
Staging and Classification
Kidney cancer is staged using the TNM system:
- T (Tumor) – Size and location of the tumor within the kidney
- N (Nodes) – Whether nearby lymph nodes are affected
- M (Metastasis) – If the cancer has spread to distant organs
Additional classifications include tumor grade (how abnormal the cells look) and histologic subtype, such as:
- Clear cell RCC (most common)
- Papillary RCC
- Chromophobe RCC
Understanding the stage and subtype helps guide treatment and predict outcomes.
Treatment Options for Kidney Cancer
Treatment depends on the stage, size, spread, and patient health status. Options include:
Localized Kidney Cancer (Early Stage)
- Partial Nephrectomy – Removes only the tumor, preserving kidney function
- Radical Nephrectomy – Removes the entire kidney, surrounding fat, and possibly lymph nodes
- Active Surveillance – For small, slow-growing tumors, especially in elderly or high-risk patients
- Ablation Therapies
- Radiofrequency Ablation (RFA): Uses heat to destroy tumor cells
- Cryoablation: Uses extreme cold to freeze cancer cells
Locally Advanced Kidney Cancer
- Radical Nephrectomy – Often the primary treatment
- Embolization – Cuts off blood supply to the tumor, used for symptom control or surgical preparation
Metastatic Kidney Cancer (Advanced Stage)
- Cytoreductive Nephrectomy – Surgery to remove tumor burden before systemic therapy
- Targeted Therapy – Drugs like sunitinib, pazopanib, or axitinib block pathways essential for tumor growth
- Immunotherapy – Checkpoint inhibitors such as nivolumab, pembrolizumab help the immune system recognize and destroy cancer cells
- Radiotherapy – Used to manage symptoms in bones or brain metastases
Palliative Care
When cure is not possible, palliative care aims to improve quality of life by relieving pain, fatigue, and emotional distress.
Clinical Trials
Clinical research offers access to emerging therapies and advanced treatment combinations. Ask your oncologist about eligibility for ongoing trials.
FAQ
Yes. Many early-stage kidney cancers are curable with surgery. Advanced stages are more complex but often manageable with therapy.
Blood in urine, flank pain, and an abdominal mass are key early symptoms.
Not necessarily. Some small tumors may be monitored with regular imaging (active surveillance).
Yes. It can spread to the lungs, liver, bones, or brain if not treated early.
Surgery remains the cornerstone for curative treatment. Targeted therapy and immunotherapy are used for advanced or metastatic cases.
Yes. Most people live normal, healthy lives with a single functioning kidney.
Conclusion
At MedicalPoint Hospital, we offer comprehensive, multidisciplinary care for kidney cancer. From early detection to robotic-assisted surgery, targeted therapies, and personalized follow-up, our team is committed to delivering the best outcomes with compassion and expertise.
If you or a loved one are experiencing symptoms or have concerns about kidney health, contact our Urology Department for a professional consultation and a personalized care plan.
WHAT WE'RE TALKING ABOUT
Life During and After IVF Treatment: What Patients Should Know
Prostate Cancer Treatment in Turkey
Coronary CT Angiography: Advanced Non-Invasive Imaging for Heart and Coronary Artery Health
