PT  - JOURNAL ARTICLE
AU  - JIRI POLIVKA, JR.
AU  - JIRI POLIVKA
AU  - TOMAS REPIK
AU  - VLADIMIR ROHAN
AU  - ONDREJ HES
AU  - ONDREJ TOPOLCAN
TI  - Co-deletion of 1p/19q as Prognostic and Predictive Biomarker for Patients in West Bohemia with Anaplastic Oligodendroglioma
DP  - 2016 Jan 01
TA  - Anticancer Research
PG  - 471--476
VI  - 36
IP  - 1
4099  - http://ar.iiarjournals.org/content/36/1/471.short
4100  - http://ar.iiarjournals.org/content/36/1/471.full
SO  - Anticancer Res2016 Jan 01; 36
AB  - Background: Anaplastic oligodendrogliomas (AO) are rare tumors. Two phase III clinical trials (RTOG 9402 and EORTC 26951) proved favorable effects of radiotherapy (RT) with chemotherapy (procarbazine, lomustine and vincristine; PCV) in patients with AO carrying chromosomal mutation of co-deletion1p/19q even if it was not the primary endpoint of these studies. We assessed 1p/19q co-deletion as a prognostic and predictive biomarker for our patients with AO. Materials and Methods: 1p/19q co-deletion was assessed by fluorescence in situ hybridization in tumor samples from 23 patients and correlated with progression-free (PFS) and overall (OS) survival for the entire cohort and for the subgroups of patients with different treatment (neurosurgery plus RT alone vs. RT plus PCV). Results: 1p/19q co-deletion was identified in 12 out of 23 tumors (52.2%). Patients with co-deletion had longer OS (587 vs. 132 weeks, p=0.012) and a trend for longer PFS (321 vs. 43 weeks, p=0.075). Patients with co-deletion treated with neurosurgery and RT plus PCV vs. neurosurgery and RT alone also had longer OS (706 vs. 423 weeks, p=0.008). There was no survival difference for patients without 1p/19q co-deletion in relation to treatment. Conclusion: The prognostic value of 1p/19q co-deletion in our patients with AO was verified. The strong positive predictive value of this biomarker for OS was also shown for patients with co-deletion treated with neurosurgery and RT plus PCV vs. neurosurgery and RT alone.