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Table 1 The characteristic of three samples for quality control

From: Comparison of the types of candidate reference samples for quality control of human epidermal growth factor receptor 2 status detection

Quality control samples

Cell lines samples

Agarose gel samples

Xenograft tumor samples

Clinical specimens

Morphological feature

Diffused distribution without tissue structure

Concentrated distribution without tissue structure

Concentrated distribution with simple tissue structure

Concentrated distribution with complicated tissue structure

Target cells count in each section

>104

>103

Countless

>102

Adhesion characteristic

Bad

Good

Good

Bad

Production process

Easy

Easy

Difficult

Difficult

Production period

1 month

1 month

3–4 months

About 2–4 months [15]

Production cost (£/sample on one section)

2.03

2.07

2.22

About 10 [15]