Humans 5 human 5 second cancer Article 4 Female 4 Male 4 adult 4 antineoplastic agent 4 cancer recurrence 4 female 4 major clinical study 4 male 4 retrospective study 4 Middle Aged 3 Retrospective Studies 3 advanced cancer 3 adverse event 3 cancer radiotherapy 3 middle aged 3 priority journal 3 procedures 3 Adolescent 2 Aged 2 Child 2 Head and Neck Neoplasms 2 Kaplan Meier method 2 Kaplan-Meier Estimate 2 Neoplasms 2 Neoplasms, Second Primary 2 Oral cancer 2