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학술저널
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이재은 (질병관리본부) 이진현 (부산대학교) 홍마리아 (질병관리본부) 박슬기 (질병관리본부) 유지인 (질병관리본부) 신소윤 (질병관리본부) 김신영 (부산대학교)
저널정보
질병관리본부 Osong Public Health and Research Persptectives Osong Public Health and Research Persptectives Vol.7 No.6
발행연도
2016.1
수록면
351 - 355 (5page)

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Objectives: Progastrin-releasing peptide (proGRP) is a promising biomarker for small cell lung cancer. However, not much is known about how sample processing and storage conditions affect the stability of proGRP. Here, we examined the effects of repeated freeze-thaw cycles on the stability of proGRP in plasma and serum. Methods: Concentrations of proGRP were measured in plasma and serum samples exposed to two, three, or four freeze-thaw cycles and these were compared with values of corresponding samples exposed to one cycle (baseline). We also performed the area under the receiver-operating-characteristic curve (AUC) analysis to determine whether the differences of proGRP concentrations between each paired plasma and serum sample (ΔproGRP) can be used for identifying the samples that have been exposed to multiple freeze-thaw cycles. Results: Concentrations of proGRP gradually decreased in both plasma and serum samples with increasing numbers of freeze-thaw cycles. Reduction rates of proGRP concentrations were greater in serum than in plasma samples and serum proGRP levels declined with statistical significance (p < 0.001) up to 10.1% after four freeze-thaw cycles. The ΔproGRP measurement showed fair accuracy (AUC Z0.741) for identifying samples that had been through four freeze-thaw cycles. The sensitivity was 82.8% and specificity was 62.1% at an optimal cut-off point of > 4.9. Conclusion: Our study shows that the stability of circulating proGRP is affected in both plasma and serum samples by repeated freezing and thawing. We also show that ΔproGRP could be used for identifying paired plasma and serum samples subjected to multiple freeze-thaw cycles.

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