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Qi P, Bai QM, Yao QL, Yang WT, Zhou XY. Performance of Automated Dissection on Formalin-Fixed Paraffin-Embedded Tissue Sections for the 21-Gene Recurrence Score Assay. Technol Cancer Res Treat 2020; 19:1533033820960760. [PMID: 33073677 PMCID: PMC7592317 DOI: 10.1177/1533033820960760] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
This study aimed to compare the performance of MilliSect dissection and manual dissection. Twenty-five formalin-fixed paraffin-embedded (FFPE) breast cancer tissue blocks were selected for comparison. Specific areas of interest (AOIs) in invasive carcinoma on tissue sections were transferred to dissection slides by manual macrodissection or the MilliSect instrument. The comparison criteria were 1) the time required for dissection; 2) RNA concentration and purity; 3) RNA quantity of 5 housekeeping genes (by RT-qPCR); and 4) ER, PR, HER2, Ki-67 and recurrence score (RS) values (by the 21-gene assay). Then, tumor-adjacent tissues, including fibrocollagenous and epithelial tissues, from the same selected tissue blocks of 8 of 25 patients were scraped using the mesodissection method, and their RS values were assessed to evaluate the influence of tumor-adjacent tissues on the target AOIs. Ultimately, 4 AOIs of invasive ductal carcinoma (IDC) from 1 tissue block of another 4 patients with lymph node (LN) metastases each, LN tissue and a mixture of IDC and LN tissue from the other tissue block of the same 4 patients were mesodissected to evaluate the influence of infiltrating lymphocyte levels on the RS values of AOIs. In our experience, the MilliSect instrument, which provides process management documentation, required more time than manual macrodissection (on average, approximately 9.1 min per sample versus 5.8 min per sample, respectively). The RNA yield and quality of the dissected tissues were comparable for the 2 methods. However, the tumor-adjacent tissues of the AOIs may influence the RS to some extent. Tumor-infiltrating lymphocytes (TILs) can dramatically increase RSs, far exceeding the influence of tumor-adjacent fibrocollagenous and epithelial tissues. In conclusion, MilliSect mesodissection is comparable to manual dissection. This mesodissection tool may facilitate AOI alignment and the dissection process for the 21-gene RS assay. Samples whose adjacent tissues are intermixed with TILs warrant special attention.
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Affiliation(s)
- Peng Qi
- Department of Pathology, 89667Fudan University Shanghai Cancer Center, Shanghai, China.,Department of Oncology, Shanghai Medical College, 89667Fudan University, Shanghai, China.,Institute of Pathology, 89667Fudan University, Shanghai, China
| | - Qian-Ming Bai
- Department of Pathology, 89667Fudan University Shanghai Cancer Center, Shanghai, China.,Department of Oncology, Shanghai Medical College, 89667Fudan University, Shanghai, China.,Institute of Pathology, 89667Fudan University, Shanghai, China
| | - Qian-Lan Yao
- Department of Pathology, 89667Fudan University Shanghai Cancer Center, Shanghai, China.,Department of Oncology, Shanghai Medical College, 89667Fudan University, Shanghai, China.,Institute of Pathology, 89667Fudan University, Shanghai, China
| | - Wen-Tao Yang
- Department of Pathology, 89667Fudan University Shanghai Cancer Center, Shanghai, China.,Department of Oncology, Shanghai Medical College, 89667Fudan University, Shanghai, China.,Institute of Pathology, 89667Fudan University, Shanghai, China
| | - Xiao-Yan Zhou
- Department of Pathology, 89667Fudan University Shanghai Cancer Center, Shanghai, China.,Department of Oncology, Shanghai Medical College, 89667Fudan University, Shanghai, China.,Institute of Pathology, 89667Fudan University, Shanghai, China
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Abstract
Mycobacterium tuberculosis, a globally significant pathogen, results in active or latent tuberculosis. The granuloma is the characteristic lesion that offers insight into host-pathogen interactions in these distinct states. Microdissection provides a way to isolate and consequently investigate specific tissue sections. We review various techniques available and in use.
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Affiliation(s)
- Teresa A Hudock
- Division of Bacteriology and Parasitology, Tulane National Primate Research Center, Covington, LA, USA; Veterinary Pathology (T32) Training Program, Tulane National Primate Research Center, Covington, LA, USA
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