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All complications, n (%)　Early complications　 SSI Incisional, n (%)　 Organ / Space, n (%)　 Dermatitis, n (%)　 Bleeding, n (%) Late complications　 Enterocutaneous fistula, n (%)　 Ventral hernia, n (%)Control(N＝21)4 (19.0)1 (4.8)0 (0)2 (9.5)0 (0)0 (0)1 (4.8)18%, but 0% by PSC13, 14). In 2014, Muhammad et al. reported a comparative study by meta-analysis of simple closure and PSC for stoma closure. PSC significantly reduced the SSI compared with simple closure15). Although the rate of SSI decreased, the wound-scarring period for PSC after stoma closure is longer than that required for the primary closure method. NPWT is applied for many types of wounds in order to reduce the incidence of SSI and shorten the healing period16-18). Previous reports considered the use of NPWT for open abdominal management or wound infection; however, the prophylactic use of NPWT is still not considered important in diges-tive surgery. There is only one report of NPWT for closure of colostomy, in which Uchino et al. used NPWT for inflammatory bowel disease patients in Figure 3　Comparison analysis for complete scarring period between closure methodsNPWT: negative-pressure wound therapyTable 2　Postoperative wound-related complications201610). According to that report, the incidence of incisional SSI was similar between the groups (p=0.76). The mean duration of complete wound healing was 37.6±11.7 days by PSC alone and 33.5± 10.0 days by PSC+NPWT. Although no adverse effects were observed in this series, the efficacy of PSC+NPWT was not confirmed. Recently, two reports regarding NPWT for ileostomy closure in colorectal cancer were published. Wierdak et al. reported a comparative study of primary wound closure with or without NPWT. Patients in the NPWT group had a significantly lower incidence of SSI (5.71% vs. 22.2%; p=0.046) and significantly shorter complete wound healing time (median 7[7-7] days vs. 7[7-15] days p=0.03)19). Okuya et al. the effectiveness of preventive NPWT for SSI development after ileostomy closure20). In this report, none of the patients were diagnosed with SSI, seroma or hematoma. NPWT-related compli-cations, such as dermatitis and wound pain, were noted in two and one patient each.In our study, incisional SSI developed in 4.8% patients with NPWT and in 3.1% patients without NPWT. The incidence of incisional SSI was similar between the groups, consistent with previous reports. The median RR was 51.5±32.7% in the PSC alone group and 68.8±20.0% in the PSC+NPWT group at 7POD. The median scarring period was 30 (17-65) days in the PSC alone group and 27.5 (11-52) days in the PSC+NPWT group. A signifi-cant difference was observed in the RR (p=0.04), but not in the scarring period (p=0.11). One reason for the lack of a significant difference in the scar-ring period was that the small wound size precluded the effects of NPWT. If the wound is larger, there P-valueNPWT(N＝32)7 (21.9)1.01 (3.1)0 (0)1 (3.1)2 (6.3)0 (0)3 (9.4)603