Significant risk of second primary cancer among laryngeal squamous cell carcinoma patients even after 20 years.

Evidence on the risk of second primary cancer (SPC) following primary laryngeal squamous cell carcinoma (LSCC) is limited, especially in Europe. Patients diagnosed with primary LSCC from 1953-2018 were retrieved from the Finnish Cancer Registry. A total of 6241 LSCC patients were identified adding to 49,393 person-years (PY) of follow-up until the end of 2019. Only one patient emigrated and was lost to follow-up. Both standardized incidence ratios (SIR) and excess absolute risk (EAR) per 1000 person-years at risk (PYR) of second primary cancer (SPC) were calculated relative to the general population. Only non-laryngeal SPCs diagnosed six months after diagnosis of primary LSCC were included. A SPC was diagnosed in 1244 LSCC patients (20% of all LSCC patients) over the 65-year period, predominantly in men (92%,  = 1170). Out of all SPCs, 34% were diagnosed within 0.5 to 5 years and 66% after 5 years from primary LSCC. Among male patients, the overall SIR for SPC at any location was 1.61 (95% CI: 1.52-1.71), corresponding to 9.49 excess SPCs per 1000 PYR (95% CI: 8.19-11). The corresponding SIR for women was 1.47 (95% CI: 1.15-1.84), yielding 4.82 excess SPCs per 1000 PYR (95% CI: 2.36-9.84). The risk remained significant even after 20 years of follow-up (SIR for all 1.73, 95% CI: 1.49-2.01 and EAR 16.8 per 1000 PY, 11.88-23.75). The risk for SPC was also significantly elevated in all age groups, except <40. The highest SIRs were for SPCs arising in the mouth/pharynx (SIR for all 3.08, 95% CI: 2.36-3.95 and EAR 0.80 per 1000 PY, 0.55-1.15) and lungs (3.02, 2.75-3.30 and 5.90 per 1000, 5.13-6.78). Patients with LSCC as primary cancer have a 60% excess risk for an SPC, especially for tobacco-associated cancers, remaining significantly elevated even decades after treatment.