Technetium-99m-Sestamibi Parathyroid Scintigraphy: Effect of P-Glycoprotein, Histology and Tumor Size on Detectability

The purpose of this study was to evaluate the effect of P-glycoprotein (P-gp) levels, predominant histology and tumor size on the detectability of parathyroid adenomas with 99mTc-sestamibi scans. Although previous studies have shown that positivity correlates with tumor size, false-negative studies...

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Veröffentlicht in:The Journal of nuclear medicine (1978) 1998-09, Vol.39 (9), p.1617-1620
Hauptverfasser: Bhatnagar, Anish, Vezza, Phyllis R, Bryan, John A, Atkins, Francis B, Ziessman, Harvey A
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container_title The Journal of nuclear medicine (1978)
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creator Bhatnagar, Anish
Vezza, Phyllis R
Bryan, John A
Atkins, Francis B
Ziessman, Harvey A
description The purpose of this study was to evaluate the effect of P-glycoprotein (P-gp) levels, predominant histology and tumor size on the detectability of parathyroid adenomas with 99mTc-sestamibi scans. Although previous studies have shown that positivity correlates with tumor size, false-negative studies have been reported with large tumors and true-positives reported with very small tumors. Recent investigations have reported rapid washout of sestamibi in malignant tumors because of high levels of P-gp, similar to that seen with multidrug chemotherapy resistance. Therefore, we postulated that this mechanism might account for false-negative studies in parathyroid tumors. Preliminary reports have suggested that the predominant histological subtype influences positivity on 99mTc-sestamibi parathyroid scans. We studied 25 patients with surgically confirmed parathyroid adenomas with 99mTc-sestamibi parathyroid scans. The results of the imaging study were correlated with tissue P-gp levels, predominant histological subtype and size of the surgically removed glands. There were 21 true-positive and 4 false-negative results. The size of the adenomas ranged from 0.12 to 8.64 ml. We found no correlation between the results of the dual-phase 99mTc-sestamibi study and either the predominant cell type or the level of P-gp. Positivity did correlate with the size of the adenoma (p=0.73, p < 0.0001). We cannot exclude the possibility that P-gp and cell type may still play a role in individual cases, but we suspect that other yet to be determined factors may influence 99mTc-sestamibi detectability in addition to tumor size.
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Although previous studies have shown that positivity correlates with tumor size, false-negative studies have been reported with large tumors and true-positives reported with very small tumors. Recent investigations have reported rapid washout of sestamibi in malignant tumors because of high levels of P-gp, similar to that seen with multidrug chemotherapy resistance. Therefore, we postulated that this mechanism might account for false-negative studies in parathyroid tumors. Preliminary reports have suggested that the predominant histological subtype influences positivity on 99mTc-sestamibi parathyroid scans. We studied 25 patients with surgically confirmed parathyroid adenomas with 99mTc-sestamibi parathyroid scans. The results of the imaging study were correlated with tissue P-gp levels, predominant histological subtype and size of the surgically removed glands. There were 21 true-positive and 4 false-negative results. The size of the adenomas ranged from 0.12 to 8.64 ml. We found no correlation between the results of the dual-phase 99mTc-sestamibi study and either the predominant cell type or the level of P-gp. Positivity did correlate with the size of the adenoma (p=0.73, p &lt; 0.0001). We cannot exclude the possibility that P-gp and cell type may still play a role in individual cases, but we suspect that other yet to be determined factors may influence 99mTc-sestamibi detectability in addition to tumor size.</description><identifier>ISSN: 0161-5505</identifier><identifier>EISSN: 1535-5667</identifier><identifier>PMID: 9744355</identifier><identifier>CODEN: JNMEAQ</identifier><language>eng</language><publisher>Reston, VA: Soc Nuclear Med</publisher><subject>Adenoma - diagnostic imaging ; Adenoma - metabolism ; Adenoma - pathology ; Adolescent ; Adult ; Aged ; ATP-Binding Cassette, Sub-Family B, Member 1 - metabolism ; Biological and medical sciences ; Endocrine glands. Genital system. 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Although previous studies have shown that positivity correlates with tumor size, false-negative studies have been reported with large tumors and true-positives reported with very small tumors. Recent investigations have reported rapid washout of sestamibi in malignant tumors because of high levels of P-gp, similar to that seen with multidrug chemotherapy resistance. Therefore, we postulated that this mechanism might account for false-negative studies in parathyroid tumors. Preliminary reports have suggested that the predominant histological subtype influences positivity on 99mTc-sestamibi parathyroid scans. We studied 25 patients with surgically confirmed parathyroid adenomas with 99mTc-sestamibi parathyroid scans. The results of the imaging study were correlated with tissue P-gp levels, predominant histological subtype and size of the surgically removed glands. There were 21 true-positive and 4 false-negative results. The size of the adenomas ranged from 0.12 to 8.64 ml. We found no correlation between the results of the dual-phase 99mTc-sestamibi study and either the predominant cell type or the level of P-gp. Positivity did correlate with the size of the adenoma (p=0.73, p &lt; 0.0001). We cannot exclude the possibility that P-gp and cell type may still play a role in individual cases, but we suspect that other yet to be determined factors may influence 99mTc-sestamibi detectability in addition to tumor size.</abstract><cop>Reston, VA</cop><pub>Soc Nuclear Med</pub><pmid>9744355</pmid><tpages>4</tpages></addata></record>
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source MEDLINE; EZB-FREE-00999 freely available EZB journals
subjects Adenoma - diagnostic imaging
Adenoma - metabolism
Adenoma - pathology
Adolescent
Adult
Aged
ATP-Binding Cassette, Sub-Family B, Member 1 - metabolism
Biological and medical sciences
Endocrine glands. Genital system. Mammary gland
Endocrinopathies
False Negative Reactions
Female
Humans
Investigative techniques, diagnostic techniques (general aspects)
Male
Malignant tumors
Medical sciences
Middle Aged
Parathyroid Glands - diagnostic imaging
Parathyroid Glands - pathology
Parathyroid Neoplasms - diagnostic imaging
Parathyroid Neoplasms - metabolism
Parathyroid Neoplasms - pathology
Parathyroids. Parafollicular cells. Cholecalciferol. Phosphocalcic homeostasis (diseases)
Preoperative Care
Radionuclide Imaging
Radionuclide investigations
Radiopharmaceuticals
Retrospective Studies
Technetium Tc 99m Sestamibi
title Technetium-99m-Sestamibi Parathyroid Scintigraphy: Effect of P-Glycoprotein, Histology and Tumor Size on Detectability
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