[Combination of environmental friendly reagent and ultrasonic assisted rapid processing for protein and molecular detection in tumor biopsy specimens].

ABSTRACT

Objective: To investigate the impact of ultrasonic assisted rapid processing technique combined with the environment friendly reagent (which can be utilized in fixing,dehydrating and clearing) on processing tumor biopsy specimens and the subsequent target detection. Methods: Postoperative tissue samples of 56 cases of breast cancer, colorectal cancer, lung cancer, stomach cancer, liver mass, bladder mass, uterus mass were obtained at the National Cancer Center, Cancer Hospital, Chinese Academy of Medical Sciences from February to April, 2017. Three specimens ranging in size from 1 to 3 mm were collected from each sample, and were separated into control group (traditional tissue-processing method); experiment group 1 (3.7% neutral buffered formaldehyde fixation, composite environment friendly reagent and ultrasonic assisted rapid processing) and experimental group 2 (composite environment friendly reagent direct fixation, higher temperature and longer time for tissue processing). Two pathologists blinded to the experimental groups scored totally the nuclear, cytoplasmic, and membrane staining of 43 cases of immunohistochemistry (IHC), four HER2 fluorescence in situ hybridization (FISH), 20 extracted DNA quality and four EGFR gene mutation detection in lung adenocarcinoma; the results were compared with the control group. Results: There was no difference in the IHC staining, HER2 FISH, the DNA quality, and EGFR genetic results between experimental group 1 and control group. For experiment group 2, comparing results of IHC staining, HER2 FISH and the quality of DNA, there was no obvious difference from control group and experiment group 1, but might show an increase in the background of IHC staining. The difference between the treatment temperature and time in the experimental group 2 did not affect the results of the gene mutation detection. Conclusions: Environment freindly reagent and ultrasonic assisted rapid processing equipment could be used for rapid processing and diagnosis for tumor biopsies. Using complex environment-friendly reagents supplement fixation, higher treatment temperature and longer treatment time do not significantly affect the IHC, FISH and molecular detection accuracy.