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Sali AP, Chaubey V, Kodare D, Sahay A, Epari S. The Rare Phenomenon of Loss of INI1 Expression at Recurrence/Progression of Primary Central Nervous System Tumors: Report of 3 Cases. Int J Surg Pathol 2019; 28:341-347. [DOI: 10.1177/1066896919883942] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
It is extremely rare for loss of immunohistochemical expression of INI1 to occur primarily at recurrence/progression with retained expression at the primary/initial presentation of central nervous system (CNS) tumor. In this article, we present 3 such cases showing loss of INI1 expression primarily at recurrence. All patients were males, aged 7 years (case 1), 11 years (case 2), and 35 years (case 3), diagnosed with low-grade glial/glioneuronal tumor, not otherwise specified (case 1), craniopharyngioma (case 2), and glioblastoma (case 3); all showed retained INI1 protein expression. Case 1 at 12 months recurrence showed a high-grade tumor with relative undifferentiated morphology, case 2 after 104 months showed a sarcomatous progression, and case 3 recurred after 4 months with the presence of relative undifferentiated round cells. All these recurrences showed loss of INI1 expression. Loss of SMARCB1/INI1 gene function resulting in complete loss of INI1 protein expression is not a well-accepted genetic mechanism for transformation/progression as this series emphasizes.
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Affiliation(s)
- Akash Pramod Sali
- Tata Memorial Hospital, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
| | - Vishal Chaubey
- Tata Memorial Hospital, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
| | - Duhita Kodare
- Tata Memorial Hospital, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
| | - Ayushi Sahay
- Tata Memorial Hospital, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
| | - Sridhar Epari
- Tata Memorial Hospital, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
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