“…1,2 Contradictory results have been reported regarding risk factors for local recurrence. 1-13 Furthermore, although the risk of recurrence persists several years after the surgery, 14 most studies report a short-term follow-up, and few use appropriate survival analyses. 1,11,15-18 Another limitation in the existing literature devoted to the analysis of SIP is the fact that numerous staging classification systems are used (detailed in Table S1 available in the online version of the journal), 7,19-25 making for difficult between-studies comparisons as well as systematic reviews and meta-analyses.…”