Medullary carcinoma of the thyroid gland: effect of postoperative transcutaneous radiotherapy on local control and results of treatment

In the period of Octo. 01, 1987. up to Dec. 31, 1998. retrospective-prospective, non-randomized study was conducted at IORS, which included 36 patients diagnosed with thyroid gland medullar cancer. Our study had the following aims: evaluation of treatment results following probability of total survival, survival without signs of disease and disease-free interval until local recurrence of the disease and influence of parameters of transcutaneous radiotherapy (intensity of total tumor dose and length of disease-free interval from date of performed operation to beginning of radiotherapy). After finished treatment, median of the patient follow-up was 37.75 months (3.5 up to 141 months); probability of total five-year survival was 62.61% and of 10 year survival was 23.48%. Probability of 5-year survival, without signs of disease was 37.13%, and of 10-year survival 18.56%. As to radiotherapy parameters intensity of total therapy dose was statistically insignificant, while time interval to beginning of transcutaneous radiotherapy, shorter than 2 months, was statistically significant in relation to prognosis of disease outcome.