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RB1, p16, and Human Papillomavirus in Oropharyngeal Squamous Cell Carcinoma

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Abstract

While P16 immunohistochemistry (IHC) is a well-established surrogate marker of Human Papillomavirus (HPV) in oropharyngeal squamous cell carcinoma (OSCC), Retinoblastoma 1 (RB1) loss may lead to p16 overexpression in the absence of HPV. We determined the proportion of p16-positive/HPV-negative OSCC with RB1 loss and other alterations in RB1/p16 pathway, and tested RB1 IHC as a prognostic biomarker for OSCC, along with the 8th edition of AJCC staging manual. P16 and RB1 IHC and HPV DNA in situ hybridization (ISH) were performed on 257 OSCC. High risk HPV RNA ISH, RB1 fluorescence in situ hybridization (FISH), and next generation sequencing (NGS) were done on p16-positive/HPV DNA ISH-negative OSCC. Disease free survival (DFS) was used as an endpoint. In the entire cohort and in p16-positive (n = 184) and p16-negative (n = 73) subgroups, AJCC 8th edition staging correlated with DFS (p < 0.01). RB1 IHC showed RB1 loss in p16-positive OSCC only (79/184, 43%). RB1 loss by IHC is associated with a better DFS, without providing additional prognostic information for patients with p16-positive OSCC. HPV RNA ISH was positive in 12 of 14 HPV DNA ISH-negative cases. RB1 IHC showed loss in 10 of 15 HPV DNA ISH-negative cases and in 1 of 2 HPV RNA ISH-negative cases. Overall, only one case of p16-positive/HPV RNA ISH-negative OSCC showed RB1 loss by IHC (1/184, 0.5%). Of the 10 p16-positive and HPV DNA ISH-negative cases with RB1 loss by IHC, 2 had RB1 hemizygous deletion and 3 showed Chromosome 13 monosomy by FISH. No RB1 mutations were detected by NGS. Other molecular alterations in p16-positive/HPV DNA ISH-negative cases included TP53 and TERT mutations and DDX3X loss. HPV-independent RB1 inactivation rarely results in false positive p16 IHC. RB1 inactivation by high risk HPV E7 oncoprotein may co-exist with RB1 deletion. RB1 loss is a favorable prognosticator and occurs exclusively in p16-positive OSCC. The 8th edition of the AJCC staging manual satisfactorily predicts DFS of OSCC patients.

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Authors and Affiliations

  1. Department of Pathology, University of Montreal, Montreal, QC, Canada

    Jérémie Berdugo

  2. Department of Pathology, The Johns Hopkins Medical Institutions, Baltimore, MD, USA

    Lisa M. Rooper

  3. Department of Pathology, Presbyterian University Hospital, University of Pittsburgh Medical Center, A610.3, 200 Lothrop St., Pittsburgh, PA, 15213, USA

    Simion I. Chiosea

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  1. Jérémie Berdugo
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  2. Lisa M. Rooper
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  3. Simion I. Chiosea
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Correspondence to Simion I. Chiosea.

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All tests performed in this retrospective study involving human participants were in accordance with the ethical standards of the institutional review board (IRB991206), which did not require informed consent.

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Berdugo, J., Rooper, L.M. & Chiosea, S.I. RB1, p16, and Human Papillomavirus in Oropharyngeal Squamous Cell Carcinoma. Head and Neck Pathol 15, 1109–1118 (2021). https://doi.org/10.1007/s12105-021-01317-5

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