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  • Author: Mildred Sifontes x
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Santiago Tofé Department of Endocrinology, University Hospital Son Espases, Palma de Mallorca, Spain

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Iñaki Argüelles Department of Endocrinology, University Hospital Son Espases, Palma de Mallorca, Spain

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Ana Forteza Department of Pathology, University Hospital Son Espases, Palma de Mallorca, Spain

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Cristina Álvarez Department of Surgery, Section of Endocrine Surgery, University Hospital Son Espases, Palma de Mallorca, Spain

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Alessandra Repetto Department of Nuclear Medicine, University Hospital Son Espases, Palma de Mallorca, Spain

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Luis Masmiquel Department of Endocrinology, University Hospital Son Llatzer, Palma de Mallorca, Spain

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Irene Rodríguez Department of Endocrinology, University Hospital Son Llatzer, Palma de Mallorca, Spain

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Eladio Losada Department of Endocrinology, Hospital Can Misses, Ibiza, Spain

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Nuria Sukunza Department of Endocrinology, Hospital de Manacor, Manacor, Spain

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María Cabrer Department of Endocrinology, Hospital Comarcal de Inca, Inca, Spain

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Mildred Sifontes Department of Pathology, Hospital Mateu Orfila, Menorca, Spain

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María del Mar del Barrio Department of Pathology, Hospital Mateu Orfila, Menorca, Spain

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Antonia Barceló Department of Laboratory, University Hospital Son Espases, Palma de Mallorca, Spain

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Álvaro Tofé Department of Maxillofacial Surgery, Hospital Puerta del Mar, Cádiz, Spain

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Vicente Pereg Department of Endocrinology, University Hospital Son Espases, Palma de Mallorca, Spain

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Objective

Global thyroid cancer (TC) incidence is growing worldwide, but great heterogenicity exists among published studies, and thus, population-specific epidemiological studies are needed to adequate health resources and evaluate the impact of overdiagnosis.

Methods

We conducted a Public Health System database retrospective review of TC incident cases from 2000 to 2020 in the Balearic Islands region and evaluated age-standardized incidence rate (ASIR), age at diagnosis, gender distribution, tumor size and histological subtype, mortality rate (MR), and cause of death. Estimated annual percent changes (EAPCs) were also evaluated and data from the 2000–2009 period were compared to the 2010–2020 period when neck ultrasound (US) was routinely performed by clinicians at Endocrinology Departments.

Results

A total of 1387 incident cases of TC were detected. Overall, ASIR (×105) was 5.01 with a 7.82% increment in EAPC. A significant increase in the 2010–2020 period was seen for ASIR (6.99 vs 2.82, P < 0.001) and age at diagnosis (52.11 vs 47.32, P < 0.001) compared to the 2000–2009 period. A reduction in tumor size (2.00 vs 2.78 cm, P < 0.001) and a 6.31% increase in micropapillary TC (P < 0.05) were also seen. Disease-specific MR remained stable at 0.21 (×105). The mean age at diagnosis for all mortality groups was older than survivors (P < 0.001).

Conclusion

The incidence of TC has grown in the 2000–2020 period in the Balearic Islands, but MR has not changed. Beyond other factors, a significant contribution of overdiagnosis to this increased incidence is likely due to changes in the routine management of thyroid nodular disease and increased availability of neck US.

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