Small tumors (T1) had the lowest expression with 1.17, with a subsequent increase over T2 (1.62) and T3 (1.92) up to a COX2 ID-Score of 2.12 for T4 vestibular schwannomas (p <  0.0001, see Fig. 2 and Table 2). Here, PTGS2 is linked to Vestibular schwannoma.