Article

[Four cases of hematologic malignancy following radioactive iodine therapy for thyroid cancer].

Department of Laboratory Medicine, Korea Cancer Center Hospital, Seoul, Korea.
The Korean Journal of Laboratory Medicine (impact factor: 0.63). 01/2009; 28(6):425-9. DOI:10.3343/kjlm.2008.28.6.425 pp.425-9
Source: PubMed

ABSTRACT Ionizing radiation including I(131) might produce chromosomal translocation, causing hematologic malignancy. The incidence of leukemia following radioactive iodine treatment for thyroid cancer has been reported to be approximately 0.1 to 2.0% in Western countries, whereas fewer cases have been reported in Korea. We hereby report four cases of secondary hematologic malignancy, who received iodine therapy for thyroid cancer after thyroidectomy: two cases of acute lymphoblastic leukemia with t(9;22)(q34;q11.2), a case of MDS with 5q deletion, and a case of MDS with normal karyotype. Three cases of hematologic malignancy have developed after cumulative dosage of less than 800 mCi. The treatment intervals in two cases were less than 12 months, and the other two cases had I(131) therapy only once. Assessment of causality using the Naranjo probability scale for adverse drug reactions showed that a 'possible' relationship existed between the use of I(131) and secondary hematologic malignancy in all of the four cases in this report.

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Keywords

'possible' relationship
 
12 months
 
acute lymphoblastic leukemia
 
adverse drug reactions
 
chromosomal translocation
 
hematologic malignancy
 
iodine therapy
 
Ionizing radiation
 
MDS
 
Naranjo probability scale
 
normal karyotype
 
radioactive iodine treatment
 
secondary hematologic malignancy
 
thyroid cancer
 
treatment intervals
 
two cases
 
Western countries