PURPOSE: The aim of this work is to determine if a relationship exists between thyroid dose and incidence of primary hypothyroidism (PH) in children undergoing craniospinal irradiation (CSI). METHODS: A total of 22 patients received CSI with evaluable thyroid dose information. All patients received concurrent chemotherapy and 21 patients (95%) received adjuvant chemotherapy. Median follow-up was 42.9 months. RESULTS: The incidence of PH in our cohort was 59% at a median time after radiotherapy of 3.5 years (range: 8 months to 7.5 years). Mean thyroid dose appeared to best predict for PH, with a median of 2080 cGy for patients with PH versus 1736 cGy for children without PH (p=0.057). There was no association between the rate of PH and sex, age, CSI dose, minimum thyroid dose and maximum thyroid dose. CONCLUSIONS: A relationship may exist between the mean thyroid dose and incidence of PH in patients undergoing CSI. Thus, new strategies to protect the thyroid gland may be warranted.
PURPOSE: The aim of this work is to determine if a relationship exists between thyroid dose and incidence of primary hypothyroidism (PH) in children undergoing craniospinal irradiation (CSI). METHODS: A total of 22 patients received CSI with evaluable thyroid dose information. All patients received concurrent chemotherapy and 21 patients (95%) received adjuvant chemotherapy. Median follow-up was 42.9 months. RESULTS: The incidence of PH in our cohort was 59% at a median time after radiotherapy of 3.5 years (range: 8 months to 7.5 years). Mean thyroid dose appeared to best predict for PH, with a median of 2080 cGy for patients with PH versus 1736 cGy for children without PH (p=0.057). There was no association between the rate of PH and sex, age, CSI dose, minimum thyroid dose and maximum thyroid dose. CONCLUSIONS: A relationship may exist between the mean thyroid dose and incidence of PH in patients undergoing CSI. Thus, new strategies to protect the thyroid gland may be warranted.
Authors: Roger J Packer; Amar Gajjar; Gilbert Vezina; Lucy Rorke-Adams; Peter C Burger; Patricia L Robertson; Lisa Bayer; Deborah LaFond; Bernadine R Donahue; MaryAnne H Marymont; Karin Muraszko; James Langston; Richard Sposto Journal: J Clin Oncol Date: 2006-09-01 Impact factor: 44.544
Authors: P K Duffner; M E Cohen; S W Anderson; M L Voorhess; M H MacGillivray; A Panahon; M L Brecher Journal: Ann Neurol Date: 1983-11 Impact factor: 10.422