“…Despite the high probability of recurrence, surgical resection with no residual tumor cell on the margin (R0 resection) remains the mainstay of treatment (Vogt, Brockmeyer, Kutzner, & Schöfer, ). Various researchers have reported that surgery improves the 5‐year survival rate compared with other treatments (odds ratio [OR] = 4.369; p = .002) and positive resection margins are associated with worse overall survival (Shin, Roh, Lee, & Yang, ; Trofymenko & Curiel‐Lewandrowski, ; Vogt et al, ). As ASs are associated with a high chance of recurrence even after complete resection of the tumor, several investigators have used adjuvant radiation therapy to achieve better local control of the disease (Kinard, Zwicker, Schmidt‐Ullrich, Kaufman, & Pieters, ; Scott et al, ).…”