Document Type : Research Paper


Department of Pathology , College of Medicine , University of Mosul , Mosul , Iraq


Digital pathology is a technology for representing whole stained tissue sections from glass slides and viewing them by a pathologist on a computer. We aim to find out the role of digital pathology in the assessment of “PD-L1 in HER2-neu-positive breast cancer” and the effect of storage time on PD-L1 expression. This is a case series study that evaluates “PD-L1 protein immunohistochemical expression” using monoclonal mouse Anti-PD-L1 (Dako), clone 22C3 on “50 formalin-fixed paraffin-embedded tissues (core biopsy)” in Iraq over 7 months and scored using a combined positive score. “PANNORAMIC® Flash DESK DX slide scanner (3DHISTECH digital pathology firm)” was used to scan the slides. The PD-L1 stained slides were stored for 7 months, then a reassessment of the 50 slides was done using a light microscope in the same methods and compare the results with digital images. The results of reassessment of the 50 glass slides after 7 months under a light microscope found that there is slight fainting in the staining and slight changes in the combined positive score in 11 cases. Digital pathology contributes to documenting the PD-L1 assessment score, the storage time of PD-L1 immunohistochemical slides will cause fainting of the staining.


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