01
Renal tubules
Renal cell carcinoma usually starts in the lining of small kidney tubules involved in filtering blood and handling waste products.
Renal Cancer Education · Kidney Biology · RCC Overview
Kidney Cancer: What Is It?
Kidney cancer, also called renal cancer, begins when abnormal cells in kidney tissue grow out of control and form a tumor. The most common adult kidney cancer type is renal cell carcinoma, often abbreviated as RCC.
Educational information only. This page does not provide diagnosis, screening
instructions, treatment recommendations or medical advice.
Kidney
RCC
Tubules
Tumor
Definition
What is kidney cancer?
Kidney cancer is a disease in which abnormal cells start growing uncontrollably in the kidney or renal pelvis. These cells may form a mass, also called a tumor.
Simple scientific definition
Kidney cancer develops when cells in kidney tissue acquire biological changes that allow abnormal growth, survival, invasion into nearby tissue and, in some cases, spread to distant organs.
Renal = kidney
“Renal cancer” is another name for kidney cancer. “Renal cell carcinoma”
usually refers to cancers that begin in the kidney tubules.
Renal Atlas
Where does kidney cancer start?
The kidneys filter blood, remove waste products and help form urine. Kidney cancer can start in different kidney structures, which is why several cancer types exist.
02
Renal pelvis
Some cancers start in the renal pelvis, the central area where urine collects before moving into the ureter.
03
Kidney tissue
Kidney tumors can grow within kidney tissue, remain localized or spread beyond the kidney depending on tumor biology and stage.
Types
Main types of kidney cancer
Kidney cancer includes several tumor types. In adults, renal cell carcinoma is the most common category, with multiple subtypes.
Clear cell renal cell carcinoma
The most common RCC subtype. It is often studied in relation to VHL biology, hypoxia signaling, angiogenesis and tumor metabolism.
Papillary renal cell carcinoma
A renal cell carcinoma subtype with distinct microscopic and molecular features.
Chromophobe renal cell carcinoma
A less common RCC subtype with different cellular appearance and biological behavior.
Renal pelvis cancer
Cancer that starts in the kidney collecting area may be biologically closer to urothelial cancers than typical renal cell carcinoma.
Biology Map
Kidney cancer biology in simple terms
Kidney tumor biology can involve oxygen-sensing pathways, blood vessel formation, immune interactions, metabolic changes and invasion into nearby tissue.
VHL
Oxygen-sensing biology
VHL-related pathways are widely studied in clear cell renal cell carcinoma biology.
HIF
Hypoxia signaling
Hypoxia-inducible signaling can influence angiogenesis, metabolism and tumor adaptation.
VEGF
Angiogenesis
Kidney tumors can be highly vascular, making blood-vessel biology important in RCC research.
PD-L1
Immune checkpoint biology
Immune signaling and tumor immune escape are important topics in kidney cancer research.
Renal Tumor Biology
VHL
HIF
VEGF
mTOR
PD-L1
Symptoms
Possible kidney cancer symptoms
Kidney cancer may not cause symptoms early. When symptoms occur, they can overlap with other kidney, urinary or abdominal conditions.
Blood in urine
Flank pain
Abdominal lump
Unexplained weight loss
Fatigue
Fever without clear cause
Anemia
Loss of appetite
Risk Factors
Risk factors commonly discussed
Kidney cancer risk can be influenced by lifestyle, medical history, inherited conditions and environmental exposures.
Smoking
Smoking is a recognized risk factor for renal cell cancer.
High blood pressure
Hypertension is commonly discussed in kidney cancer risk literature.
Obesity
Excess body weight is associated with increased kidney cancer risk.
Family history
Some kidney cancers are linked to inherited risk syndromes or family history.
Kidney disease
Long-term kidney disease and certain dialysis-related conditions may affect risk.
Workplace exposures
Some chemical and occupational exposures are studied as possible risk factors.
Imaging
CT
MRI
Ultrasound
Labs
Diagnosis Context
How kidney cancer may be found
Kidney tumors are sometimes found during imaging performed for another reason. Evaluation may include imaging, urine tests, blood tests, pathology review or additional staging tests depending on the clinical situation.
Imaging
Ultrasound, CT or MRI may identify a kidney mass and help evaluate its size and location.
Laboratory tests
Blood and urine tests may provide information about kidney function, anemia or urinary findings.
Staging tests
Additional imaging may be used to evaluate whether cancer has spread beyond the kidney.
Simple Summary
Kidney cancer in simple terms
Kidney cancer starts when cells in the kidney become abnormal and grow into a tumor. The most common adult form is renal cell carcinoma.
Is kidney cancer the same as renal cancer?
Yes. “Renal” means kidney, so renal cancer is another name for kidney cancer.
What is renal cell carcinoma?
Renal cell carcinoma is a kidney cancer type that usually begins in the lining of small kidney tubules.
Can kidney cancer be found without symptoms?
Yes. Some kidney tumors are found incidentally during imaging tests done for unrelated reasons.
FAQ
FAQ: Kidney Cancer
Clear answers to common questions about kidney cancer, renal cancer and RCC.
What is kidney cancer?
Kidney cancer is cancer that starts in the kidney. It happens when abnormal cells grow out of control and may form a tumor.
What is renal cell carcinoma?
Renal cell carcinoma, or RCC, is the most common adult kidney cancer type and usually begins in the lining of small kidney tubules.
What are possible kidney cancer symptoms?
Possible symptoms include blood in the urine, flank pain, a lump in the abdomen, fatigue, unexplained weight loss, fever without clear cause or anemia.
Does kidney cancer always cause symptoms?
No. Kidney cancer may cause no symptoms early and may be found incidentally on imaging performed for another reason.
Is this page medical advice?
No. This page is educational only and does not replace consultation with a qualified healthcare professional.
References
Scientific References
Authoritative sources used to support the kidney cancer education content.
- Centers for Disease Control and Prevention. Kidney Cancer Basics.
- National Cancer Institute. Renal Cell Cancer Treatment PDQ.
- American Cancer Society. Kidney Cancer.
- SEER Cancer Stat Facts. Kidney and Renal Pelvis Cancer.
- National Cancer Institute / NIH resources on renal cell cancer biology and staging.