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Biomarkers used to assess radio- and chemotherapy-induced lymphocyte genome instability in a case of cerebral infarction during relapse of a testicular seminoma

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Gamulin M., Pastuhović A., Šantek F., Grgić M., Kopjar N.

Biomonitoring

2014

vol. 1

issue 1

We report a case of a testicular seminoma patient with relapse who was irradiated after acute cerebral infarction induced by cisplatin-based chemotherapy. Lymphocytic genome instability was studied using an alkaline comet assay, analysis of structural chromosome aberrations, and cytokinesis-block micronucleus assay in blood samples collected before and after PET CT scanning that preceded radiotherapy, as well as before the administration of the first and after the administration of the last fraction of 3D conformal radiation. A challengetest with hydrogen peroxide (H2O2) was performed on isolated peripheral blood lymphocytes in order to establish to what extent earlier therapies had modified the response of the patient’s DNA to external stimuli with a genotoxic chemical. Levels of primary DNA damage in lymphocytes increased after diagnostic exposure, lowered prior to administration of a conformal 3D radiotherapy, and were the highest at the end of radiotherapy. Ex vivo exposure to H2O2 caused additional lymphocyte DNA damage, which gradually increased 15 and 30 minutes after treatment. Diagnostic and therapeutic exposure to radiation caused measurable cytogenetic damage that was subjected to extensive repair. All of the obtained results point to increased genomic instability in the patient which should be taken into account in his future medical surveillance.

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1 Biomonitoring

1 2014

1 Gamulin M.

1 Grgić M.

1 Kopjar N.

1 Pastuhović A.

1 Šantek F.

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Biomarkers used to assess radio- and chemotherapy-induced lymphocyte genome instability in a case of cerebral infarction during relapse of a testicular seminoma