Abstract
Objectives/Hypothesis: Generation of an immunosuppressive microenvironment may enable a persistent human papillomavirus infection in the setting of an otherwise normal immune system. We hypothesized that expression of the T-lymphocyte co-inhibitory receptor programmed death 1 (PD-1) and its ligand PD-L1 would be increased in the recurrent respiratory papillomatosis (RRP) microenvironment compared to normal controls. Study Design: Case-control study. Methods: Formalin-fixed paraffin-embedded respiratory papilloma and normal controls were obtained under institutional review board approval, stained for CD4, CD8, FoxP3, and PD-1, and scored by automated cell count. PD-L1 staining was scored by a blinded pathologist using an adjusted inflammation score that accounted for epithelial and immune infiltrate. Results: Thirty-nine RRP cases and seven controls were studied. All immunologic markers demonstrated significantly increased staining in RRP specimens compared to normal controls (all P <.01). PD-1 correlated with both CD4 (P <.0001) and CD8 (P <.001) cell counts. Epithelial staining for PD-L1 (68%) and PD-L1+ infiltrating immune cells (76%) were observed in the majority of papilloma samples. The strongest staining for PD-L1 was usually observed in the basal papilloma layer adjacent to the immunologic infiltrate in the vascular core. Disease severity inversely correlated with CD8 cell counts (P =.01). A correlation between disease severity and other immunologic markers was not observed. Conclusions: Most RRP specimens demonstrate PD-1 T-lymphocyte infiltration and PD-L1 expression on both papilloma and infiltrating immune cells. This study suggests that this checkpoint pathway may be contributing to local immunosuppression in RRP, and opens the door for clinical trials utilizing PD-blocking monoclonal antibodies. Level of Evidence: NA Laryngoscope, 128:E27–E32, 2018.
| Original language | English (US) |
|---|---|
| Pages (from-to) | E27-E32 |
| Journal | Laryngoscope |
| Volume | 128 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 1 2018 |
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Keywords
- human papillomavirus
- laryngeal papilloma
- programmed death
- Recurrent respiratory papillomatosis
ASJC Scopus subject areas
- Otorhinolaryngology
Cite this
The PD-1 and PD-L1 pathway in recurrent respiratory papillomatosis. / Ahn, Julie; Bishop, Justin A.; Roden, Richard B.S.; Allen, Clint T.; Best, Simon R.A.
In: Laryngoscope, Vol. 128, No. 1, 01.01.2018, p. E27-E32.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The PD-1 and PD-L1 pathway in recurrent respiratory papillomatosis
AU - Ahn, Julie
AU - Bishop, Justin A.
AU - Roden, Richard B.S.
AU - Allen, Clint T.
AU - Best, Simon R.A.
PY - 2018/1/1
Y1 - 2018/1/1
N2 - Objectives/Hypothesis: Generation of an immunosuppressive microenvironment may enable a persistent human papillomavirus infection in the setting of an otherwise normal immune system. We hypothesized that expression of the T-lymphocyte co-inhibitory receptor programmed death 1 (PD-1) and its ligand PD-L1 would be increased in the recurrent respiratory papillomatosis (RRP) microenvironment compared to normal controls. Study Design: Case-control study. Methods: Formalin-fixed paraffin-embedded respiratory papilloma and normal controls were obtained under institutional review board approval, stained for CD4, CD8, FoxP3, and PD-1, and scored by automated cell count. PD-L1 staining was scored by a blinded pathologist using an adjusted inflammation score that accounted for epithelial and immune infiltrate. Results: Thirty-nine RRP cases and seven controls were studied. All immunologic markers demonstrated significantly increased staining in RRP specimens compared to normal controls (all P <.01). PD-1 correlated with both CD4 (P <.0001) and CD8 (P <.001) cell counts. Epithelial staining for PD-L1 (68%) and PD-L1+ infiltrating immune cells (76%) were observed in the majority of papilloma samples. The strongest staining for PD-L1 was usually observed in the basal papilloma layer adjacent to the immunologic infiltrate in the vascular core. Disease severity inversely correlated with CD8 cell counts (P =.01). A correlation between disease severity and other immunologic markers was not observed. Conclusions: Most RRP specimens demonstrate PD-1 T-lymphocyte infiltration and PD-L1 expression on both papilloma and infiltrating immune cells. This study suggests that this checkpoint pathway may be contributing to local immunosuppression in RRP, and opens the door for clinical trials utilizing PD-blocking monoclonal antibodies. Level of Evidence: NA Laryngoscope, 128:E27–E32, 2018.
AB - Objectives/Hypothesis: Generation of an immunosuppressive microenvironment may enable a persistent human papillomavirus infection in the setting of an otherwise normal immune system. We hypothesized that expression of the T-lymphocyte co-inhibitory receptor programmed death 1 (PD-1) and its ligand PD-L1 would be increased in the recurrent respiratory papillomatosis (RRP) microenvironment compared to normal controls. Study Design: Case-control study. Methods: Formalin-fixed paraffin-embedded respiratory papilloma and normal controls were obtained under institutional review board approval, stained for CD4, CD8, FoxP3, and PD-1, and scored by automated cell count. PD-L1 staining was scored by a blinded pathologist using an adjusted inflammation score that accounted for epithelial and immune infiltrate. Results: Thirty-nine RRP cases and seven controls were studied. All immunologic markers demonstrated significantly increased staining in RRP specimens compared to normal controls (all P <.01). PD-1 correlated with both CD4 (P <.0001) and CD8 (P <.001) cell counts. Epithelial staining for PD-L1 (68%) and PD-L1+ infiltrating immune cells (76%) were observed in the majority of papilloma samples. The strongest staining for PD-L1 was usually observed in the basal papilloma layer adjacent to the immunologic infiltrate in the vascular core. Disease severity inversely correlated with CD8 cell counts (P =.01). A correlation between disease severity and other immunologic markers was not observed. Conclusions: Most RRP specimens demonstrate PD-1 T-lymphocyte infiltration and PD-L1 expression on both papilloma and infiltrating immune cells. This study suggests that this checkpoint pathway may be contributing to local immunosuppression in RRP, and opens the door for clinical trials utilizing PD-blocking monoclonal antibodies. Level of Evidence: NA Laryngoscope, 128:E27–E32, 2018.
KW - human papillomavirus
KW - laryngeal papilloma
KW - programmed death
KW - Recurrent respiratory papillomatosis
UR - http://www.scopus.com/inward/record.url?scp=85038415183&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85038415183&partnerID=8YFLogxK
U2 - 10.1002/lary.26847
DO - 10.1002/lary.26847
M3 - Article
VL - 128
SP - E27-E32
JO - Laryngoscope
JF - Laryngoscope
SN - 0023-852X
IS - 1
ER -