Patient characteristics

VariableUnadjusted populationPSM-adjusted population
All patients (N = 258)No-BZD cohort (N = 150)BZD cohort (N = 108)P valueSMDAll patients (N = 216)No-BZD cohort
(N = 108)
BZD cohort (N = 108)P valueSMD
Age
- Mean (SD), years70.0 (8.4)70.0 (7.9)69.5 (9.0)0.332-70.0 (8.43)70.0 (7.77)69.5 (9.04)0.457-
- ≥ 70 years136 (52.7%)82 (54.7%)54 (50.0%)0.4590.046111 (51.4%)57 (52.8%)54 (50.0%)0.6850.027
Sex
- Female78 (30.2%)40 (26.7%)38 (35.2%)0.2070.09374 (34.3%)36 (33.3%)38 (35.2%)0.7760.018
- Male180 (69.8%)110 (73.3%)70 (64.8%)142 (65.7%)72 (66.7%)70 (64.8%)
ECOG PS
- 0 or 1208 (80.6%)120 (80.0%)88 (81.5%)0.7660.014175 (81.0%)87 (80.6%)88 (81.5%)0.8630.009
- 250 (19.4%)30 (20.0%)20 (18.5%)41 (19.0%)21 (19.4%)20 (18.5%)
Histologic subtype
- Nonsquamous202 (78.3%)118 (78.7%)84 (77.8%)0.864< 0.001167 (77.3%)83 (76.9%)84 (77.8%)0.8720.009
- Squamous56 (21.7%)32 (21.3%)24 (22.2%)49 (22.7%)25 (23.1%)24 (22.2%)
No. of metastatic sites
- ≤ 2138 (53.5%)79 (52.7%)59 (54.6%)0.7550.019120 (55.6%)61 (56.5%)59 (54.6%)0.7850.067
- > 2120 (46.5%)71 (47.3%)49 (45.4%)96 (44.4%)47 (43.5%)49 (45.4%)
Bone metastasis53 (20.5%)30 (19.1%)23 (21.3%)0.799< 0.00144 (20.4%)21 (19.4%)23 (21.3%)0.7370.055
Brain metastasis58 (22.5%)30 (20.0%)28 (25.9%)0.261< 0.00155 (25.5%)27 (25.0%)28 (25.9%)0.8770.059
Liver metastasis28 (10.9%)19 (12.7%)9 (8.3%)0.2700.04320 (9.3%)11 (10.2%)9 (8.3%)0.6410.039
PD-L1 TPS
- < 1%80 (31.0%)45 (30.0%)35 (32.4%) 0.0660.32671 (32.9%)36 (33.3%)35 (32.4%)0.6630.083
- ≥ 1% and ≤ 49%22 (8.5%)8 (5.3%)14 (13.0%)22 (10.2%)8 (7.4%)14 (13.0%)
- ≥ 50% 156 (60.5%)97 (64.7%)59 (54.6%)123 (56.9%)64 (59.3%)59 (54.6%)
BMI
- Mean (SD), kg/m225.1 (4.80)24.8 (5.0)25.6 (4.5)0.635< 0.00125.9 (4.87)26.0 (5.15)25.6 (4.55)0.233-
- ≥ 25130 (50.4%)73 (48.7%)57 (52.8%)0.515114 (52.8%)57 (52.8%)57 (52.8%)0.999< 0.001
Smoking habits
- Never23 (8.9%)14 (9.3%)9 (8.3%)0.781< 0.00120 (9.3%)11 (10.2%)9 (8.3%)0.641< 0.001
- Ever235 (91.1%)136 (90.7%)99 (91.7%)196 (90.7%)97 (89.8%)99 (91.7%)
Previous thoracic RT35 (13.6%)16 (10.7%)19 (17.6%)0.109< 0.00128 (13.0%)9 (8.3%)19 (17.6%)0.043< 0.001
LIPI score
- 0100 (38.8%)60 (40.0%)40 (37.0%)0.740< 0.00184 (38.9%)44 (40.7%)40 (37.0%)0.742< 0.001
- 188 (34.1%)52 (34.7%)36 (33.3%)68 (31.5%)32 (29.6%)36 (33.3%)
- 270 (27.1%)38 (25.3%)32 (29.7%)64 (29.6%)32 (29.6%)32 (29.6%)
First-line therapy
- Only pembrolizumab156 (60.5%)96 (64.0%)60 (55.6%)0.377< 0.001124 (57.4%)64 (59.3%)60 (55.6%)0.596< 0.001
- Pemetrexed-based84 (32.6%)45 (30.0%)39 (36.1%)75 (34.7%)36 (33.3%)39 (36.1%)
- Paclitaxel-based18 (7.0%)9 (6.0%)9 (8.3%)17 (7.9%)8 (7.4%)9 (8.3%)
Corticosteroidsa103 (39.9%)54 (36.0%)49 (45.4%)0.129< 0.00194 (43.5%)45 (41.7%)49 (45.4%)0.585< 0.001
APAPb101 (39.1%)67 (44.7%)34 (31.5%)0.0320.13162 (28.7%)28 (25.9%)34 (31.5%)0.369< 0.001
Systemic antibioticsc58 (22.5%)38 (25.3%)20 (18.5%)0.1960.06840 (18.5%)20 (18.5%)20 (18.5%)0.999< 0.001
PPId88 (34.1%)59 (39.3%)29 (26.9%)0.0360.12458 (26.9%)29 (26.9%)29 (26.9%)0.999< 0.001
Specific BZD intake
- N-substitutede57 (22.1%)-57 (52.8%)--57 (26.4%)-57 (52.8%)--
- N-unsubstitutedf51 (19.7%)51 (47.2%)51 (23.6%)51 (47.2%)

PSM: propensity score matching; BZD: benzodiazepine; SMD: standardized mean difference; SD: standard deviation; ECOG PS: Eastern Cooperative Oncology Group Performance Status; PD-L1 TPS: programmed cell death ligand-1 tumor proportion score; BMI: body mass index; RT: radiotherapy; LIPI: lung immune prognostic index; APAP: acetaminophen; PPI: proton pump inhibitors. a Corticosteroids refer to the use of prednisone or an equivalent drug at a dose of at least 10 mg per day for at least 5 days within the 30 days before the start of treatment, excluding premedication for chemotherapy; b APAP refers to the use of at least 1,000 mg per day for more than 24 h during the 30 days before the start of treatment; c systemic antibiotics and d PPI refer to the use of these medications in the 30 days before the start of treatment; e N-substituted denoted intake of alprazolam, diazepam, bromazepam, or triazolam; f N-unsubstituted denoted intake of lorazepam, clonazepam, delorazepam, or lormetazepam