Journal of Pathology and Translational Medicine

Joon Im

2 Articles

MicroRNA-552 expression in colorectal cancer and its clinicopathological significance: Joon Im, Soo Kyung Nam, Hye Seung Lee; J Pathol Transl Med. 2021;55(2):125-131. Published online February 19, 2021; DOI: https://doi.org/10.4132/jptm.2021.01.17

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Background
MicroRNA-552 (miR-552) has been reported to correlate with the development and progression of various cancers, including colorectal cancer (CRC). This study aimed to investigate miR-552 expression in cancer tissue samples compared to normal mucosal tissue and its role as a diagnostic or prognostic marker in CRC patients.
Methods
Normal mucosal tissues and primary cancer tissues from 80 surgically resected CRC specimens were used. Quantitative real-time polymerase chain reaction was performed for miR-552 and U6 small nuclear RNA to analyze miR-552 expression and its clinicopathological significance. Immunohistochemistry for p53 and phosphatase and tension homolog (PTEN) was performed to evaluate their association with miR-552 expression.
Results
miR-552 expression was significantly higher in primary cancer tissues compared to normal mucosal tissues (p<.001). The expression level of miR552 was inversely correlated with that of PTEN (p=.068) and p53 (p=.004). Survival analysis showed that high miR-552 expression was associated with worse prognosis but this was not statistically significant (p=.255). However, patients with CRC having high miR-552 expression and loss of PTEN expression had significantly worse prognosis than others (p=.029).
Conclusions
Our results suggest that high miR-552 expression might be a potential diagnostic biomarker for CRC, and its combined analysis with PTEN expression can possibly be used as a prognostic marker.

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Integration of TE Induces Cancer Specific Alternative Splicing Events
Woo Ryung Kim, Eun Gyung Park, Yun Ju Lee, Woo Hyeon Bae, Du Hyeong Lee, Heui-Soo Kim
International Journal of Molecular Sciences.2022; 23(18): 10918. CrossRef

Effects of Fixation and Storage of Human Tissue Samples on Nucleic Acid Preservation: Soo Kyung Nam, Joon Im, Yoonjin Kwak, Nayoung Han, Kyung Han Nam, An Na Seo, Hye Seung Lee; Korean J Pathol. 2014;48(1):36-42. Published online February 25, 2014; DOI: https://doi.org/10.4132/KoreanJPathol.2014.48.1.36

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28 Citations

Abstract PDF

Background

Because of recent advances in the molecular diagnosis of cancer patients, tissue quality has become more important in daily practice.

Methods

To evaluate the effects of fixative, duration of fixation, decalcification, and storage periods on nucleic acid integrity, DNA and RNA were extracted from gastrointestinal cancer tissue. The yield and purity were analyzed, and polymerase chain reaction (PCR) for glyceraldehyde 3-phosphate dehydrogenase (GAPDH; 60 bp), β-actin (148 bp), and human growth hormone (hGH; 434 bp) and real-time reverse transcription-PCR for β-actin (97 bp) were performed.

Results

All formalin-fixed paraffin-embedded (FFPE) and methacarn-fixed paraffin-embedded (MFPE) samples tested positive for GAPDH and β-actin by PCR. hGH was successfully detected in all MFPE samples, but in only 46.7% of the FFPE samples. Prolonged formalin fixation resulted in fewer GAPDH and β-actin PCR products, and amplification of hGH was not successful. The PCR and reverse transcription-PCR results were significantly affected by the duration of decalcification. The yield, purity, and integrity of mRNA progressively decreased with increased storage periods of paraffin blocks.

Conclusions

Fixation and storage should therefore be standardized in order to improve the quality of molecular pathologic diagnosis.

Citations

Citations to this article as recorded by

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