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J Neurol Surg B Skull Base 2018; 79(05): 482-488
DOI: 10.1055/s-0038-1627474
Original Article
Georg Thieme Verlag KG Stuttgart · New York

Macrophage Density Predicts Facial Nerve Outcome and Tumor Growth after Subtotal Resection of Vestibular Schwannoma

Christopher S. Graffeo
1   Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota, United States
,
Avital Perry
1   Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota, United States
,
Aditya Raghunathan
2   Department of Laboratory Medicine & Pathology, Mayo Clinic, Rochester, Minnesota, United States
,
Trynda N. Kroneman
2   Department of Laboratory Medicine & Pathology, Mayo Clinic, Rochester, Minnesota, United States
,
Mark Jentoft
2   Department of Laboratory Medicine & Pathology, Mayo Clinic, Rochester, Minnesota, United States
,
Colin L. Driscoll
1   Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota, United States
3   Department of Otolaryngology-Head and Neck Surgery, Mayo Clinic, Rochester, Minnesota, United States
,
Brian A. Neff
1   Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota, United States
3   Department of Otolaryngology-Head and Neck Surgery, Mayo Clinic, Rochester, Minnesota, United States
,
Matthew L. Carlson
1   Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota, United States
3   Department of Otolaryngology-Head and Neck Surgery, Mayo Clinic, Rochester, Minnesota, United States
,
Jeffrey Jacob
4   Departments of Neurosurgery, Michigan Head & Spine Institute, Royal Oak, Michigan, United States
,
Michael J. Link
1   Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota, United States
3   Department of Otolaryngology-Head and Neck Surgery, Mayo Clinic, Rochester, Minnesota, United States
,
Jamie J. Van Gompel
1   Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota, United States
3   Department of Otolaryngology-Head and Neck Surgery, Mayo Clinic, Rochester, Minnesota, United States
› Author Affiliations
Further Information

Publication History

10 February 2017

02 January 2018

Publication Date:
07 February 2018 (online)

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Abstract

Introduction Vestibular schwannoma (VS) behavior following subtotal resection (STR) is highly variable. Overall progression rates have been reported as high as 44%, and optimal treatment is controversial. Correspondingly, identification of a reliable clinical or pathologic marker associated with progression after STR would help guide decision-making.

Methods A prospectively maintained institutional VS registry from 1999 to 2014 was retrospectively reviewed for sporadic VS patients who underwent primary STR without preceding stereotactic radiosurgery (SRS) by a single neurosurgery-neurotology team. Primary endpoints included tumor progression and postoperative facial nerve function. Pathologic specimens were stained for Ki67, CD68, S100, and SOX10 and were quantitated by digital imaging analysis. Macrophage density was defined as the ratio of CD68+ macrophages to S100+ macrophages and Schwannian tumor cells. Clinical outcomes were correlated with pathologic markers.

Results Forty-six patients met the study inclusion criteria. Thirteen (28%) progressed during a mean 57 months of follow-up (range 15–149). Favorable postoperative facial nerve function (House–Brackmann I–II) was achieved in 37 (80%). CD68+ cells were present at significantly higher concentrations in tumors that progressed (p = 0.03). Higher macrophage density was significantly associated with both tumor progression (p = 0.02) and unfavorable facial nerve function (p = 0.02). Ki67 percent positivity was not significantly associated with either primary endpoint (p = 0.83; p = 0.58).

Conclusions Macrophage density may provide an important marker for individuals at the highest risk for progression of VS after STR, potentially prompting closer surveillance or consideration for upfront SRS following STR. This finding supports preceding conclusions that an intratumoral macrophage-predominant inflammatory response may be a marker for tumor growth and a potential therapeutic target.

Keywords

vestibular schwannoma - subtotal resection - tumor recurrence - tumor progression - macrophages - macrophage density

Financial Material and Support

Internal departmental funding was utilized without commercial sponsorship or support.


Previous Presentation

Components of this manuscript were presented at the North American Skull Base Society 2017 annual meeting


 

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