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IHC tests are classified in a paper by Torlakovic ''et al.'':<ref name=pmid20154273>{{Cite journal | last1 = Torlakovic | first1 = EE. | last2 = Riddell | first2 = R. | last3 = Banerjee | first3 = D. | last4 = El-Zimaity | first4 = H. | last5 = Pilavdzic | first5 = D. | last6 = Dawe | first6 = P. | last7 = Magliocco | first7 = A. | last8 = Barnes | first8 = P. | last9 = Berendt | first9 = R. | title = Canadian Association of Pathologists-Association canadienne des pathologistes National Standards Committee/Immunohistochemistry: best practice recommendations for standardization of immunohistochemistry tests. | journal = Am J Clin Pathol | volume = 133 | issue = 3 | pages = 354-65 | month = Mar | year = 2010 | doi = 10.1309/AJCPDYZ1XMF4HJWK | PMID = 20154273 }}</ref> | IHC tests are classified in a paper by Torlakovic ''et al.'':<ref name=pmid20154273>{{Cite journal | last1 = Torlakovic | first1 = EE. | last2 = Riddell | first2 = R. | last3 = Banerjee | first3 = D. | last4 = El-Zimaity | first4 = H. | last5 = Pilavdzic | first5 = D. | last6 = Dawe | first6 = P. | last7 = Magliocco | first7 = A. | last8 = Barnes | first8 = P. | last9 = Berendt | first9 = R. | title = Canadian Association of Pathologists-Association canadienne des pathologistes National Standards Committee/Immunohistochemistry: best practice recommendations for standardization of immunohistochemistry tests. | journal = Am J Clin Pathol | volume = 133 | issue = 3 | pages = 354-65 | month = Mar | year = 2010 | doi = 10.1309/AJCPDYZ1XMF4HJWK | PMID = 20154273 }}</ref> | ||
*''Class I'': | *''Class I'': | ||
**Results used by pathologists. | |||
**Adjunct to histomorphology. | **Adjunct to histomorphology. | ||
**Examples: CD45, S-100. | **Examples: CD45, S-100. | ||
*''Class II'': | *''Class II'': | ||
**Used by clinicans for treatment decisions. | |||
**Considered independent of the other information in the pathology report; thus, cannot be derived from other information in the report. | **Considered independent of the other information in the pathology report; thus, cannot be derived from other information in the report. | ||
**Examples: ER, PR, HER2. | **Examples: ER, PR, HER2. | ||
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