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Impact of HPV DNA ((A) p = 0.26 at Log-Rank) and of p16 expression ((B) IRS ≥ 4 cut-off p = 0.049 at Log-Rank; (C) IRS ≥ 6 cut-off p = 0.26 at Log-Rank) on relapse free survival of primarily operated patients (HPV DNA was available in 66 cases, p16 IHC in 73).
