Manas Panigrahi1, Dilip Kumar2, Sudhindra Vooturi3, Shailaja Madigubba4. 1. Department of Neurosurgery, Krishna Institute of Medical Sciences, Secunderabad, Telangana, India. Electronic address: manasp1966@gmail.com. 2. Department of Neurosurgery, Krishna Institute of Medical Sciences, Secunderabad, Telangana, India. 3. Department of Neurology, Krishna Institute of Medical Sciences, Secunderabad, Telangana, India. 4. Department of Pathology, Krishna Institute of Medical Sciences, Secunderabad, Telangana, India.
Abstract
OBJECTIVE: Nearly 9.2% of vestibular schwannomas (VS) recur. We evaluate the association of cell proliferative markers like MIB with recurrence in VS. METHODS: Retrospective data of 144 consecutive patients who underwent surgical excision for sporadic VS between January 2010 and July 2015 were collected. Comparison between groups based on recurrence of VS was done. RESULTS: The average age of the study population was 43.95 ± 12.86 years with 77 (53.5%) men. The average maximal diameter of VS was 40.25 ± 7.23 mm. Gross total resection was done in 52 (36.1%) patients. While near total resection was performed in 81 (56.3%) patients, the remaining 11 (7.6%) patients underwent a subtotal resection. The mean follow-up period was 37.99 ± 10.09 months (24-60). Recurrence of VS was observed in 18 (12.5%) patients. There was no difference between the groups for diameter of the tumor (42.22 ± 8.04 vs. 39.64 ± 7.00 mm; P = 0.191). The average MIB index value was higher in patients with recurrence of tumor at follow-up (4.78 ± 5.77 vs. 1.89 ± 1.48 mm; P < 0.001). There was no difference between the groups for extent of resection or postoperative complications. MIB was the only significant predictor for recurrence (β = 1.355 (1.07-1.78; confidence interval 95%); P = 0.031). On receiver operating characteristic curves, a cutoff value of 3.5% for MIB showed a specificity of 84.1%. CONCLUSIONS: MIB index ≥3.5% is associated with recurrence in VS. Maximal diameter of the tumor and extent of resection are perhaps not associated with recurrence of VS.
OBJECTIVE: Nearly 9.2% of vestibular schwannomas (VS) recur. We evaluate the association of cell proliferative markers like MIB with recurrence in VS. METHODS: Retrospective data of 144 consecutive patients who underwent surgical excision for sporadic VS between January 2010 and July 2015 were collected. Comparison between groups based on recurrence of VS was done. RESULTS: The average age of the study population was 43.95 ± 12.86 years with 77 (53.5%) men. The average maximal diameter of VS was 40.25 ± 7.23 mm. Gross total resection was done in 52 (36.1%) patients. While near total resection was performed in 81 (56.3%) patients, the remaining 11 (7.6%) patients underwent a subtotal resection. The mean follow-up period was 37.99 ± 10.09 months (24-60). Recurrence of VS was observed in 18 (12.5%) patients. There was no difference between the groups for diameter of the tumor (42.22 ± 8.04 vs. 39.64 ± 7.00 mm; P = 0.191). The average MIB index value was higher in patients with recurrence of tumor at follow-up (4.78 ± 5.77 vs. 1.89 ± 1.48 mm; P < 0.001). There was no difference between the groups for extent of resection or postoperative complications. MIB was the only significant predictor for recurrence (β = 1.355 (1.07-1.78; confidence interval 95%); P = 0.031). On receiver operating characteristic curves, a cutoff value of 3.5% for MIB showed a specificity of 84.1%. CONCLUSIONS:MIB index ≥3.5% is associated with recurrence in VS. Maximal diameter of the tumor and extent of resection are perhaps not associated with recurrence of VS.
Authors: Abdullah Egiz; Hritik Nautiyal; Andrew F Alalade; Nihal Gurusinghe; Gareth Roberts Journal: J Neurooncol Date: 2022-06-27 Impact factor: 4.506