The modified SIR score is calculated as the addition of partial scores obtained from five prognostic factors: Age, KPS, extracranial disease status, number of brain metastases, and volume of the largest brain metastasis.
Poor risk = 0 to 4 versus good risk = 5 to 10.
Reference:
- Serizawa T, Higuchi Y, Nagano O, et al. A new grading system focusing on neurological outcomes for brain metastases treated with stereotactic radiosurgery: the modified Basic Score for Brain Metastases. J Neurosurg 2014; 121 Suppl 2:35.
Reproduced from: Weltman E, Salvajoli JV, Brandt RA, et al. Radiosurgery for brain metastases: a score index for predicting prognosis. Int J Radiat Oncol Biol Phys 2000; 46:1155. Table used with the permission of Elsevier Inc. All rights reserved.