Renal cell carcinoma
Kidney cancer arising from proximal tubule lining.
Renal cell carcinoma (RCC) is a form of kidney cancer that starts in the lining of the proximal convoluted tubule—the tiny tubes within the kidney that carry primary urine. Among adults, it is the most common kidney cancer, making up about 90 to 95 percent of all cases. Men are affected more often than women, with a ratio as high as two to one. The condition is most frequently found in older adults, particularly those over 75.
The body is surprisingly good at hiding this cancer, so many people already have advanced disease by the time it is discovered. Early symptoms often include blood in the urine (seen in 40 percent of people when they first seek help), pain in the flank (also 40 percent), a lump in the abdomen or flank (25 percent), weight loss (33 percent), fever (20 percent), high blood pressure (20 percent), night sweats, and a general feeling of being unwell. If the cancer spreads, it most often goes to the lymph nodes, lungs, liver, adrenal glands, brain, or bones. Immunotherapy and targeted therapies have improved the outlook for cases that have metastasized.
RCC is also linked to paraneoplastic syndromes—conditions caused by hormones the tumor produces or by the body’s immune response against it—which occur in about 20 percent of people with RCC. These syndromes usually affect tissues not invaded by the cancer. The most common ones include high blood calcium levels, a high red blood cell count, a high platelet count, and secondary amyloidosis.
Historically, doctors expected a person with RCC to show three classic signs: blood in the urine, flank pain, and an abdominal mass. But this triad appears in only 10 to 15 percent of cases and usually signals advanced disease. Today, RCC often has no symptoms at all and is frequently found by accident during exams for other health issues. The number of such incidental diagnoses, especially for smaller tumors, has been rising.
Other possible signs include loin pain, an abdominal mass, malaise (a general feeling of being unwell), weight loss or loss of appetite, anemia (from low erythropoietin), erythrocytosis (from too much erythropoietin), varicocele in males (especially on the left side), high blood pressure (from renin secretion), hypercalcemia, sleep problems or night sweats, recurring fevers, and chronic fatigue.
The biggest risk factors for RCC are lifestyle-related: smoking, obesity, and high blo
- field
- Oncology, Urology
- known_for
- Most common adult kidney cancer, often asymptomatic until advanced stages
- risk_factors
- Smoking, obesity, hypertension (account for up to 50% of cases)
- five_year_survival_non_metastatic
- 65–90%
- classic_triad_frequency
- 10–15% of cases
Lore & Background
Renal cell carcinoma (RCC) originates in the cells of the proximal renal tubular epithelium and is considered an adenocarcinoma. It has two subtypes: sporadic and hereditary, both associated with mutations on the short arm of chromosome 3, involving tumor suppressor genes (VHL and TSC) or oncogenes (c-Met). The body is remarkably good at hiding symptoms, so people with RCC often have advanced disease by the time it is discovered. Historically, medical practitioners expected a classic triad of haematuria, flank pain, and an abdominal mass, but this triad occurs in only 10–15% of cases and usually indicates advanced disease. Today, RCC is often asymptomatic and detected incidentally during examinations for unrelated conditions.
Reader's Guide
Renal cell carcinoma is significant as the most common kidney cancer in adults, accounting for 90–95% of cases. Its greatest risk factors are lifestyle-related—smoking, obesity, and hypertension—estimated to account for up to 50% of cases. The disease is often hidden, with many patients presenting at an advanced stage. Initial treatment is partial or complete removal of the affected kidney(s). When the cancer has not metastasized, the five-year survival rate is 65–90%, but this drops considerably with spread. Immunotherapy and targeted therapy have improved the outlook for metastatic RCC. RCC is also associated with paraneoplastic syndromes in about 20% of cases, including high blood calcium, high red blood cell count, high platelet count, and secondary amyloidosis. The 2004 WHO classification recognizes over 40 subtypes of renal neoplasms, and novel subtypes continue to be described.
Did You Know?
- RCC is more common in men, with a male-to-female ratio of up to 2:1.
- The classic triad of haematuria, flank pain, and abdominal mass occurs in only 10–15% of cases.
- Smoking, obesity, and hypertension account for up to 50% of RCC cases.
- Patients with acquired cystic disease of the kidney requiring dialysis are 30 times more likely to develop RCC.
More in Medical triads 1-24
Spotted an error? Know more?
This is a living reference — every entry is fact-audited, and reader corrections feed straight into our audit queue. Suggest an edit · See this site's audit record