Table 6. The factors affecting seropositivity in the patient group (multivariate analysis).

Characteristics	SE	RR	95% CI	p-value
Age (<60 vs ≥60)	0.276	3.016	1.758–5.176	<0.001†
Gender (female vs male)	0.221	1.154	0.701–1.667	0.724
Chemotherapy (yes vs no)	0.358	1.396	0.692–2.818	0.038†
Targeted therapy or IO (yes vs no)	0.300	0.709	0.393–1.277	0.351
Comorbidities (yes vs no)	0.213	1.116	0.736–1.692	0.606
Stage (metastatic vs nonmetastatic)	0.304	1.458	0.804–2.645	0.214

^†Statistically significant results.

IO: Immunotherapy; RR: Relative risk; SE: Standard error.