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[[Category:Kidney Cancer]] == Epidemiology == Many databases include upper tract urothelial carcinoma with kidney cancer and therefore independent incidence of kidney cancer cannot be assessed * [https://pubmed.ncbi.nlm.nih.gov/33538338/ GLOBOCAN] includes ICD-9 C65 - "Malignant neoplasm of renal pelvis" with kidney cancer === Incidence === * Incidence has been increasing due to (2): # Increased use of diagnostic imaging #* Greatest increase has been in small, clinically localized renal amsses which now represent > 40% of incident tumours. # Increased prevalence of risk factors (e.g. obesity), see below *'''Worldwide''' **Incidence rates are higher in developed countries *** Likely due to increased use of diagnostic imaging * '''US'''[https://acsjournals.onlinelibrary.wiley.com/doi/full/10.3322/caac.21763] ** Includes renal pelvis cancers ** '''Estimated incidence 2023: 81,800''' (2022: 79,000) * '''Canada'''[https://pubmed.ncbi.nlm.nih.gov/32122974/] ** Includes renal pelvis cancers ** Estimated incidence 2020: 7,500 *** 10th most commonly diagnosed cancer in Canada === Mortality === * '''US'''[https://pubmed.ncbi.nlm.nih.gov/35020204/] ** Includes renal pelvis cancers ** '''Estimated mortality 2022: 13,920''' (2021: 13,780[https://pubmed.ncbi.nlm.nih.gov/33433946/]) * 5-year relative survival (survival relative to population without disease) based on disease stage at diagnosis[https://pubmed.ncbi.nlm.nih.gov/33433946/]: ** Localized: 93% ** Regional: 70% ** Distant: 13% ** All stages: 75% * '''Most lethal of all GU malignancies''' ** 5-year relative survival all stages for[https://pubmed.ncbi.nlm.nih.gov/33433946/]: *** Prostate cancer: 98% *** Bladder: 77% * Survival has been increasing (β1% year since 2004) === <span style="color:#ff0000">Gender</span> === * '''<span style="color:#ff0000">Incidence M:F 1.75:1[https://pubmed.ncbi.nlm.nih.gov/35020204/]</span>''' ** '''Overall mortality worse in males''' === Age === * Typical presentation between age 50-70; median age at diagnosis: 64 ** '''RCC in children and young adults is more likely to be symptomatic, locally advanced, high grade, and of unfavorable histologic subtypes.''' *** Children and young adults may respond better to surgical therapy and aggressive approach and formal lymphadenectomy has been recommended at the time of radical nephrectomy === Race === * More common in Blacks, American Indian, and Alaska Native populations than Whites == Pathogenesis == === Risk Factors === ==== Acquired ==== *'''Majority of cases are believed to be sporadic''' * '''<span style="color:#ff0000">Established risk factors (4):''' *# '''<span style="color:#ff0000">Obesity''' *#* Accounts for β30% of incident cases *#* Obese patients are more likely to develop RCC but these tumours are more likely to be low-grade, early stage tumours *# '''<span style="color:#ff0000">Smoking''' *#* Accounts for β20% of incident cases *# '''<span style="color:#ff0000">Hypertension''' *# '''<span style="color:#ff0000">Chronic renal failure''' *#* '''Controversial;''' however, patients on maintenance dialysis also are reported to have an increased risk *#** It has been suggested to delay screening for kidney cancer in patients on dialysis and without other major comorbidities until the 3rd year on dialysis. * '''Other risk factors (5):''' *# '''Family history of renal malignancy (without familial syndrome)''' *# '''Exposure to chlorinated solvents''' *# '''Retroperitoneal radiation''' *# '''Diet''' *#* '''Moderate alcohol intake, consumption of fruits and (cruciferous) vegetables, and a diet rich in fatty fish are believed to reduce the risk of RCC''' *# '''Acquired cystic renal disease''' * '''No increased risk of RCC in patients with autosomal dominant polycystic kidney disease''' ==== Inherited ==== ===== Familial Renal Cell Carcinoma Syndromes ===== *'''<span style="color:#ff0000">All are autosomal dominant</span>''' *'''<span style="color:#ff0000">Accounts for β4-6% of incident cases[https://pubmed.ncbi.nlm.nih.gov/34115547/]''' {| class="wikitable" |'''<span style="color:#ff0000">Syndrome</span>''' |'''<span style="color:#ff0000">Gene</span>''' |'''<span style="color:#ff0000">Clinical Manifestations</span>''' |- |'''<span style="color:#ff0000">Von Hippel-Lindau (VHL)</span>''' |'''<span style="color:#ff0000">VHL</span>''' |'''<span style="color:#0000ff">HIPPPEEL</span>''' #'''<span style="color:#ff0000">CNS and/or retinal </span><span style="color:#0000ff">H</span><span style="color:#ff0000">emangioblastomas</span>''' #'''<span style="color:#ff0000">ccRCC (</span><span style="color:#0000ff">I</span><span style="color:#ff0000">ncreased risk) and renal cysts</span>''' #'''<span style="color:#0000ff">P</span><span style="color:#ff0000">heochromocytoma</span>''' #'''<span style="color:#0000ff">P</span><span style="color:#ff0000">araganglioma</span>''' #'''<span style="color:#0000ff">P</span><span style="color:#ff0000">ancreatic neuroendocrine tumours and cysts</span>''' #'''<span style="color:#0000ff">E</span><span style="color:#ff0000">pididymal cystadenoma</span>''' #'''<span style="color:#ff0000">Ear </span><span style="color:#0000ff">E</span><span style="color:#ff0000">ndolymphatic sac tumour</span>''' #'''<span style="color:#ff0000">Broad </span><span style="color:#0000ff">L</span><span style="color:#ff0000">igament tumours</span>''' |- |'''<span style="color:#ff0000">Hereditary Papillary Renal Carcinoma (HPRCC)</span>''' |'''''<span style="color:#ff0000">c-MET</span>''''' | #'''<span style="color:#ff0000">Type 1 papillary RCC</span>''' |- |'''<span style="color:#ff0000">Hereditary Leiomyomatosis and RCC (HLRCC)*</span>''' |'''<span style="color:#ff0000">Fumarate hydratase</span>''' | #'''<span style="color:#ff0000">Type 2 papillary or collecting duct RCC</span>''' #'''<span style="color:#ff0000">Cutaneous leioyomyomas</span>''' #'''<span style="color:#ff0000">Uterine leiyomyomas</span>''' |- |'''<span style="color:#ff0000">Birt-Hogg-Dube (BHD)</span>''' |'''<span style="color:#ff0000">Folliculin</span>''' | #'''<span style="color:#ff0000">Skin fibrofolliculomas</span>''' #'''<span style="color:#ff0000">Pulmonary cysts, spontaneous pneumothoraces</span>''' #'''<span style="color:#ff0000">Variety of renal tumours (including chromophobe RCC, oncocytoma, hybrid oncocytic/chromophobe tumors,</span> clear cell RCC (rare), renal cysts)''' |- |'''<span style="color:#ff0000">Succinate Dehydrogenase RCC*</span>''' |'''''SDHB/C/D (encoding subunits of the Krebs cycle enzyme succinate dehydrogenase)''''' | #'''Variety of renal tumours (clear cell RCC, chromophobe RCC, type 2 papillary RCC, oncocytoma)''' #'''<span style="color:#ff0000">Adrenal pheochromocytoma/paraganglioma</span>''' |- |'''<span style="color:#ff0000">Tuberous Sclerosis Complex (TSC)</span>''' |'''''<span style="color:#ff0000">TSC1/2</span>''''' | #'''<span style="color:#ff0000">Skin (adenoma subaceum, shagreen spots)</span>''' #'''<span style="color:#ff0000">Variety of renal tumours (increased predisposition for ccRCC, AMLs,</span> renal cysts, polycystic kidney disease, oncycytoma)''' #'''<span style="color:#ff0000">Retinal hamartomas</span>''' #'''<span style="color:#ff0000">CNS lesions (including tubers)</span>''' #'''<span style="color:#ff0000">Seizures</span>''' #'''<span style="color:#ff0000">Intellectual disability</span>''' #'''<span style="color:#ff0000">Cardiac lesions</span>''' #'''<span style="color:#ff0000">Teeth/gum lesions</span>''' #'''<span style="color:#ff0000">Bone cysts</span>''' #'''<span style="color:#ff0000">Pulmonary lymphangiomyomatosis</span>''' |- |'''Cowden/PTEN Syndrome Associated RCC''' |'''''PTEN''''' | *'''Mucocutaneous lesions''' *'''Facial trichilemmomas''' *'''Papillomatous papules''' *'''Variety of renal tumours (ccRCC, type 1 papillary RCC, chromophobe RCC)''' *'''Malignancies in other organ systems (breast, thyroid)''' |- |'''<span style="color:#ff0000">BAP-1 tumour predisposition syndrome[https://www.ncbi.nlm.nih.gov/books/NBK390611/]</span>''' |'''<span style="color:#ff0000">BAP1</span>''' | *'''<span style="color:#ff0000">ccRCC</span>''' *'''<span style="color:#ff0000">Uveal melanoma</span>''' *'''Malignant mesothelioma''' *'''Cutaneous melanoma''' *'''Melanocytic tumours''' *'''Basal cell carcinoma''' |- | colspan="3" |'''<span style="color:#ff0000">*Renal cancers associated with these syndromes are typically more aggressive</span>''' |} ====== <span style="color:#ff0000">Von Hippel-Lindau Disease</span> ====== *Incidence 1:30,000-1:40,000 *'''<span style="color:#ff0000">RCC develops in 35-70% of VHL patients</span> and is''' '''distinctive for early age (median 40) of onset and bilateral and multifocal involvement''' *'''<span style="color:#ff0000">Mutation: VHL</span>''' **'''VHL is a tumor suppressor gene,''' for both familial and sporadic ccRCC, at '''chromosome 3'''p25-26 ***'''<span style="color:#ff0000">VHL mutation is most common genetic mutation in sporadic RCC[https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3483538/]</span>''' **Under normal conditions, the '''<span style="color:#ff0000">VHL complex targets hypoxia-inducible factors (HIF) for degradation</span>''', keeping levels of HIF low. HIF regulates response to hypoxia, starvation, and other stresses **'''<span style="color:#ff0000">In the absence of VHL, HIF accumulates and leads to overexpression of vascular endothelial growth factor (VEGF), the primary angiogenic growth factor in RCC''', contributing to the neovascularity associated with ccRCC. ***Production of erythropoietin (EPO) is closely associated with circulating oxygen levels. During conditions of hypoxia, hypoxia-inducible factor-1-alpha (HIF-1-a) is upregulated increasing EPO transcription. HIF-1-a is then rapidly degraded by proteases upon restoration of normal oxygen tension. *'''<span style="color:#ff0000">Pheochromocytoma manifestations of VHL are restricted to certain families (type 2 VHL)</span>''' *'''Patients suspected of having VHL, or the appropriate relatives of those with documented disease, should strongly consider genetic evaluation.''' **Patients with germline mutations of the VHL gene can be offered screening to identify major manifestations of VHL at a pre-symptomatic phase *'''<span style="color:#ff0000">RCC is most common cause of death in VHL patients</span>''' ====== <span style="color:#ff0000">Hereditary Papillary Renal Cell Carcinoma (HPRCC)</span> ====== *Tumours tend to be '''less aggressive''' than their sporadic counterparts *'''Most of the mutations in HPRCC have been found in the tyrosine kinase domain of met and lead to <span style="color:#ff0000">constitutive activation of the receptor for hepatocyte growth factor</span>''' ====== <span style="color:#ff0000">Hereditary leiomyomatosis and RCC syndrome (HLRCC)</span> ====== *'''<span style="color:#ff0000">Almost all individuals with this syndrome will develop cutaneous leiomyomas and uterine fibroids (if female),</span>''' usually manifesting at the age of 20-35 years. **'''A high proportion of women have had a hysterectomy for fibroids before formal diagnosis of HLRCC'''. *'''Only a minority (20%) of HLRCC patients develop RCC''' **Penetrance for RCC in HLRCC is lower than for the cutaneous and uterine manifestations *Unlike other familial syndromes, '''tumours with this syndrome tend to be unilateral, solitary, and''' '''<span style="color:#ff0000">more aggressive</span>'''; therefore, '''prompt surgical management is indicated''' ====== Tuberous Sclerosis Complex (TSC) ====== *Classic triad: *#Seizures *#Adenoma sebaceum *#Intellectual disability **May not be present due to variable penetrance of the TSC mutation *'''50% of patients with TSC develop AMLs''' == Questions == # What proportion of RCCs are familial? #What are the clinical manifestations of VHL? # What gene is mutated and what are the clinical manifestations of HRPCC, HLPCC, Burt-Hogg-Dube, Tuberous Sclerosis Complex? #Explain the pathway of VHL and HIF and role in RCC pathophysiology # What are the risk factors for RCC? == Answers == # What proportion of RCCs are familial? #* β4-6% #What are the clinical manifestations of VHL? ##Hemangioblastoma ##Increased risk of ccRCC ##Paraganglioma ##Pheochromocyoma ##Pancreatic cysts and neuroendocrine tumours ##Ear endolymphatic tumour ##Epididymal cysts ##Ligament, broad tumours #What gene is mutated and what are the clinical manifestations of HRPCC, HLPCC, Burt-Hogg-Dube, Tuberous Sclerosis Complex? #*HRPCC: c-met; clinical manifestations: type I papillary RCC #*HLPCC: fumarate hydratase; clinical manifestations; type II papillary RCC, cutaneous leiyomyoma and uterine leiyomyoma #*Burt-Hogg-Dube: folliculin; clinical manifestations: pneumothorax, pulmonary cysts, skin fibrofolliculuomas, chromophobe RCC and other renal tumours #*Tuberous sclerosis complex: TSC1 and TSC2; clinical manifestations: adenoma subaceum, shagreen spots, AMLs, ccRCC, retinal hamartomas, CNS lesions, epilepsy, mental retardation, cardiac lesions, teeth lesions, gum lesions, bone cysts, pulmonary lymphangiomyomatosis #Explain the pathway of VHL and HIF and role in RCC pathophysiology #*Under normal conditions, VHL targets hypoxia-induced factor (HIF) for degradation. In the absence of VHL due to mutation, HIF accumulates resulting in increased expression of VEGF, the primary angiogenic growth factor for RCC #What are the established risk factors for RCC? ## Obesity ## Hypertension ## Smoking ## Acquired cystic disease ## Familial syndrome == Next Chapter: [[Kidney Cancer: Pathology and Familial Syndromes|Pathology]] == == References == * Wein AJ, Kavoussi LR, Partin AW, Peters CA (eds): CAMPBELL-WALSH UROLOGY, ed 11. Philadelphia, Elsevier, 2015, chap 57 * Campbell, Steven C., et al. "Renal Mass and Localized Renal Cancer: Evaluation, Management, and Follow-Up: AUA Guideline Part I." ''The Journal of urology'' (2021): 10-1097.
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