Cavernous sinus invasion and tumor proliferative potential of growth hormone-producing pituitary tumors.

Abstract:

PURPOSE:Surgical removal of growth hormone-producing pituitary adenomas (GHomas) becomes difficult when they invade the cavernous sinus (CS). We investigated the relation among tumor proliferative potential, tumor volume and invasion of GHomas to CS. MATERIALS & METHODS:15 patients with GHoma aged 20-59 years were enrolled. The volumes of the adenomas were calculated from MR images and the extension to CS was classified into 5 grades according to Knosp's grading system. The immuno-histochemical staining for anti-Ki-67 monoclonal antibody (MIB-1) was performed and the proliferative potential of GHomas was determined as the percentage of MIB-1 labeled nuclei (MIB-1 index). The volume, MIB-1 index and pre-operative growth hormone (GH) level were compared with CS invasion by single and multiple regression analyses. RESULTS:With single regression analyses, CS invasion was significantly correlated with both the volume (r=0.69, p<0.01) and MIB-1 index (r=0.73, p<0.01), but not with the GH level (r=0.42, p=0.12). The volume and MIB-1 index showed a weak correlation but it was not significant (r=0.52, p=0.06). With multiple regression analysis, CS invasion was well explained by the volume and MIB-1 index of GHomas (r=0.82, p<0.01). About 66% of CS invasion was explained by these two factors. CONCLUSIONS:In view of these results, not only the volume but also the speed of growth are important for GHomas to invade CS. GHomas with a high MIB-1 index may, even if they are small, more readily invade CS and need closer post-operative hormonal and neuroimaging studies.

journal_name

Endocr J

journal_title

Endocrine journal

authors

Iuchi S,Saeki N,Uchino Y,Higuchi Y,Tatsuno I,Nakamura S,Yasuda T,Yamaura A

doi

10.1507/endocrj.47.supplmarch_s77

subject

Has Abstract

pub_date

2000-03-01 00:00:00

pages

S77-9

eissn

0918-8959

issn

1348-4540

journal_volume

47 Suppl

pub_type

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