Which clinical and biological tumor markers proved predictive in the prospective multicenter trial HIT'91--implications for investigating childhood medulloblastoma.

Abstract:

BACKGROUND:Most recent studies analyzing candidate biological prognostic factors in childhood medulloblastoma (MB) are limited by small patient numbers due to dependence on fresh-frozen tumor material. By contrast, large archives of formalin-fixed, paraffin-embedded MB samples exist from homogeneously treated patients. PATIENTS AND METHODS:We have optimized RNA and DNA isolation from formalin-fixed paraffin-embedded MB samples. We then analyzed archived tumor samples from well-documented patients treated within the prospective randomized multicenter trial HIT'91 for DNA amplification of c-myc and N-myc, and mRNA expression of c-myc and trkC. RESULTS:TrkC and c-myc mRNA expression were identified as independent prognostic factors by multivariate analysis. Three risk groups were identified: 1) Favorable risk group: All 8 patients (2 metastatic) with elevated trkC and reduced c-myc mRNA expression (compared to levels of human cerebellum) remained relapse-free (7-year EFS 100%). 2) Poor risk group: 10 of 15 patients with metastatic disease and high c-myc and low trkC mRNA expression relapsed (7-year EFS 33%). 3) Intermediate risk group: The 7-year EFS of the remaining 78 patients was 65%. CONCLUSIONS:While the collection of fresh-frozen tumor samples is remaining a major challenge in large clinical trials, routinely processed paraffin-embedded tissue samples can be used to quantitate biological prognostic factors on the DNA and RNA level. Upon prospective validation of cut-off levels, this may lead to better risk-based stratification systems for children with medulloblastoma.

journal_name

Klin Padiatr

journal_title

Klinische Padiatrie

authors

Grotzer MA,von Hoff K,von Bueren AO,Shalaby T,Hartmann W,Warmuth-Metz M,Emser A,Kortmann RD,Kuehl J,Pietsch T,Rutkowski S

doi

10.1055/s-2007-985843

subject

Has Abstract

pub_date

2007-11-01 00:00:00

pages

312-7

issue

6

eissn

0300-8630

issn

1439-3824

journal_volume

219

pub_type

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