Diagnostic discrepancies in malignant astrocytoma due to limited small pathological tumor sample can be overcome by IDH1 testing

Y S Betty Kim, Wen Jiang, Jason Beiko, Sujit S. Prabhu, Franco Demonte, Mark R. Gilbert, Raymond Sawaya, Kenneth D. Aldape, Daniel P. Cahill, Ian E. McCutcheon

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The accurate grading of malignant astrocytomas has significant prognostic and therapeutic implications. Traditional histopathological grading can be challenging due to regional tumor heterogeneity, especially in scenarios where small amounts of tissue are available for pathologic review. Here, we hypothesized that a critical tumor resection volume is needed for correct grading of astrocytomas by histopathology. For insufficient tissue sampling, IDH1 molecular testing can act as a complementary marker to improve diagnostic accuracy. Volumetric analyses were obtained using preoperative and postoperative MRI images. Histological specimens were gathered from 403 patients with malignant astrocytoma who underwent craniotomy. IDH1 status was assessed by immunohistochemistry and sequencing. Patients with >20 cubic centimeters (cc) of the total tumor volume resected on MRI have higher rate of GBM diagnosis compared to <20 cc [odds ratio (OR) 2.57, 95 % confidence interval (CI) 1.6-4.06, P < 0.0001]. The rate of IDH1 status remained constant regardless of the tumor volume resected (OR 0.81, 95 % CI 0.48-1.36, P < 0.43). The rate of GBM diagnosis is twofold greater for individual surgical specimen >10 cc than those of lower volume (OR 2.48, 95 % CI 1.88-3.28, P < 0.0001). Overall survival for AA patients with >20 cc tumor resection on MRI is significantly better than those with <20 cc tumor resected (P < 0.05). No volume-dependent differences were observed in patients with GBM (P < 0.4), IDH1 wild type (P < 0.1) or IDH1 mutation (P < 0.88). IDH1 status should be considered when total resection volume is <20 cc based on MRI analysis and for surgical specimen <10 cc to complement histopathologic diagnosis of malignant astrocytomas. In these specimens, under-diagnosis of GBM may occur when analysis is restricted to histopathology alone.

Original languageEnglish (US)
Pages (from-to)405-412
Number of pages8
JournalJournal of Neuro-Oncology
Volume118
Issue number2
DOIs
StatePublished - 2014

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Astrocytoma
Tumor Burden
Neoplasms
Craniotomy
Immunohistochemistry
Mutation
Therapeutics

Keywords

  • Anaplastic astrocytoma
  • Diagnosis
  • Glioblastoma
  • Isocitrate dehydrogenase
  • Malignant astrocytoma
  • Surgical resection

ASJC Scopus subject areas

  • Clinical Neurology
  • Cancer Research
  • Oncology
  • Neurology
  • Medicine(all)

Cite this

Diagnostic discrepancies in malignant astrocytoma due to limited small pathological tumor sample can be overcome by IDH1 testing. / Kim, Y S Betty; Jiang, Wen; Beiko, Jason; Prabhu, Sujit S.; Demonte, Franco; Gilbert, Mark R.; Sawaya, Raymond; Aldape, Kenneth D.; Cahill, Daniel P.; McCutcheon, Ian E.

In: Journal of Neuro-Oncology, Vol. 118, No. 2, 2014, p. 405-412.

Research output: Contribution to journalArticle

Kim, YSB, Jiang, W, Beiko, J, Prabhu, SS, Demonte, F, Gilbert, MR, Sawaya, R, Aldape, KD, Cahill, DP & McCutcheon, IE 2014, 'Diagnostic discrepancies in malignant astrocytoma due to limited small pathological tumor sample can be overcome by IDH1 testing', Journal of Neuro-Oncology, vol. 118, no. 2, pp. 405-412. https://doi.org/10.1007/s11060-014-1451-0
Kim, Y S Betty ; Jiang, Wen ; Beiko, Jason ; Prabhu, Sujit S. ; Demonte, Franco ; Gilbert, Mark R. ; Sawaya, Raymond ; Aldape, Kenneth D. ; Cahill, Daniel P. ; McCutcheon, Ian E. / Diagnostic discrepancies in malignant astrocytoma due to limited small pathological tumor sample can be overcome by IDH1 testing. In: Journal of Neuro-Oncology. 2014 ; Vol. 118, No. 2. pp. 405-412.
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abstract = "The accurate grading of malignant astrocytomas has significant prognostic and therapeutic implications. Traditional histopathological grading can be challenging due to regional tumor heterogeneity, especially in scenarios where small amounts of tissue are available for pathologic review. Here, we hypothesized that a critical tumor resection volume is needed for correct grading of astrocytomas by histopathology. For insufficient tissue sampling, IDH1 molecular testing can act as a complementary marker to improve diagnostic accuracy. Volumetric analyses were obtained using preoperative and postoperative MRI images. Histological specimens were gathered from 403 patients with malignant astrocytoma who underwent craniotomy. IDH1 status was assessed by immunohistochemistry and sequencing. Patients with >20 cubic centimeters (cc) of the total tumor volume resected on MRI have higher rate of GBM diagnosis compared to <20 cc [odds ratio (OR) 2.57, 95 {\%} confidence interval (CI) 1.6-4.06, P < 0.0001]. The rate of IDH1 status remained constant regardless of the tumor volume resected (OR 0.81, 95 {\%} CI 0.48-1.36, P < 0.43). The rate of GBM diagnosis is twofold greater for individual surgical specimen >10 cc than those of lower volume (OR 2.48, 95 {\%} CI 1.88-3.28, P < 0.0001). Overall survival for AA patients with >20 cc tumor resection on MRI is significantly better than those with <20 cc tumor resected (P < 0.05). No volume-dependent differences were observed in patients with GBM (P < 0.4), IDH1 wild type (P < 0.1) or IDH1 mutation (P < 0.88). IDH1 status should be considered when total resection volume is <20 cc based on MRI analysis and for surgical specimen <10 cc to complement histopathologic diagnosis of malignant astrocytomas. In these specimens, under-diagnosis of GBM may occur when analysis is restricted to histopathology alone.",
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AU - Beiko, Jason

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AU - Demonte, Franco

AU - Gilbert, Mark R.

AU - Sawaya, Raymond

AU - Aldape, Kenneth D.

AU - Cahill, Daniel P.

AU - McCutcheon, Ian E.

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