Incidence, risk factors and tumor spectrum of second primary cancers after gastric cancer: a multicenter cohort study with long-term follow-up.
BACKGROUND The development of second primary cancers (SPCs) has become an important late effect in gastric cancer (GC) survivors, yet its incidence, risk factors, and clinical implications remain poorly defined. This study aimed to evaluate the long-term risk of SPCs, identify clinical factors associated with SPC occur...