TABLE 1.

Baseline characteristics of patients.

Category	N (%)
Age	Median 61 (range 40–80)
Sex	Female: 14 (23) Male: 47 (77)
Race	White: 56 (92) Black: 5 (8)
Smoking	Yes: 38 (62) No: 23 (38)
Primary site	Oral cavity: 22 (36) Oropharynx: 20 (33) HPV a (+): 14/20 (70) Larynx/hypopharynx: 12(20) Other: 7 (11)
Type of recurrence	Locoregional only: 26 (43) Distant only: 12 (20) Locoregional + distant: 23 (37)
Indication for anti‐PD‐1	Platinum failure: 37 (61%) Frontline: 24 (39%)
PD‐L1 by CPS b	Positive: 17 (29) Negative: 17 (29) Unknown: 27 (44)

^a HPV by p16 or HPV ISH for oropharynx primary.

^b PD‐L1 expression by combined positive score. Positive defined as ≥1.