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\n\t\n\t\n\t Changes - Jesse's Wiki

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919 bytes added ,  01:00, 13 September 2020
init
* poor morphology
** struggle to make diagnosis, if at all possible
* IHC
** primary diagnosis
** prognostic / predictive factors
*** ER, PR HER2/Neu
*** Mismatch repair proteins
*** PD-L1 and other biomarkers

Fixation
* stability of tissue components
* increases avidity for dyes

Poor Fixation
* degradation/sloughing of mucosa layer (like in colon)
* contour and detail

Irreversible Fixation
* covalent bonding by methylene bridges, altering structure
* over-fixation makes this worse, irreversible altered protein shape
* standardized IHC tests rely on a certain degree of how altered the protein shape gets
* Newfoundland breast cancer scandal Cameron Inquiry https://www.cihrt.nl.ca/transcripts.html
* particularly important for membranous pattern stains, like CD20 (as opposed to nuclear or cytoplasmic)

Decalcification
* destroys RNA, DNA
* particularly important to note for metastases (Primary diagnosis)
5

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