Created at 7:35 p.m. Mar, 17, 2025
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ronin16319
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My own mnemonic, might be helpful for others :)
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{{c1::Right}}-sided colorectal carcinoma usually arises as a result of the microsatellite instability pathway
Lecture Notes
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Missed Questions
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Pathoma
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Boards and Beyond
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First Aid
Sketchy
Watch Colorectal Polyps & Cancer
Watch Colorectal Polyps & Cancer
Sketchy 2
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Sketchy Extra
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Picmonic
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Pixorize
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Physeo
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Bootcamp
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OME
Additional Resources
Atlas:
Colorectal carcinogenesis pathways
Top: Chromosomal instability pathway (adenoma-carcinoma sequence)
- Loss of the tumor suppressor gene, APC, results in hyperproliferative epithelium due to a loss of cellular adhesion and increased cellular proliferation. A mutation in KRAS results in unregulated cellular signaling and cellular proliferation, leading to the formation of an adenoma. Loss of the tumor suppressor genes TP53 and DCC results in the malignant transformation of an adenoma to carcinoma. The chromosomal instability pathway is responsible for carcinomas in FAP (loss of APC) as well as in most cases of sporadic colorectal carcinoma.
- Loss of the tumor suppressor gene, APC, results in hyperproliferative epithelium due to a loss of cellular adhesion and increased cellular proliferation. A mutation in KRAS results in unregulated cellular signaling and cellular proliferation, leading to the formation of an adenoma. Loss of the tumor suppressor genes TP53 and DCC results in the malignant transformation of an adenoma to carcinoma. The chromosomal instability pathway is responsible for carcinomas in FAP (loss of APC) as well as in most cases of sporadic colorectal carcinoma.
Bottom: Microsatellite instability pathway
- Acquired or inherited mutations in the mismatch repair genes (esp. MLH1 and MSH2) result in abnormal proliferation and the formation of adenoma and carcinoma. The microsatellite instability pathway is responsible for carcinomas in Lynch syndrome (HNPCC) and a few cases of sporadic colorectal carcinoma.
- Acquired or inherited mutations in the mismatch repair genes (esp. MLH1 and MSH2) result in abnormal proliferation and the formation of adenoma and carcinoma. The microsatellite instability pathway is responsible for carcinomas in Lynch syndrome (HNPCC) and a few cases of sporadic colorectal carcinoma.
Atlas:
One by one
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