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. 2015 May;16(5):569-82.
doi: 10.1016/S1470-2045(15)70114-2. Epub 2015 Apr 14.

Molecular subgroups of atypical teratoid rhabdoid tumours in children: an integrated genomic and clinicopathological analysis

Jonathon Torchia  1 Daniel Picard  1 Lucie Lafay-Cousin  2 Cynthia E Hawkins  3 Seung-Ki Kim  4 Louis Letourneau  5 Young-Shin Ra  6 King Ching Ho  7 Tiffany Sin Yu Chan  1 Patrick Sin-Chan  1 Christopher P Dunham  8 Stephen Yip  9 Ho-Keung Ng  10 Jian-Qiang Lu  11 Steffen Albrecht  12 José Pimentel  13 Jennifer A Chan  14 Gino R Somers  15 Maria Zielenska  15 Claudia C Faria  16 Lucia Roque  17 Berivan Baskin  18 Diane Birks  19 Nick Foreman  19 Douglas Strother  2 Almos Klekner  20 Miklos Garami  21 Peter Hauser  21 Tibor Hortobágyi  22 Laszló Bognár  20 Beverly Wilson  23 Juliette Hukin  24 Anne-Sophie Carret  25 Timothy E Van Meter  26 Hideo Nakamura  27 Helen Toledano  28 Iris Fried  29 Daniel Fults  30 Takafumi Wataya  31 Chris Fryer  32 David D Eisenstat  33 Katrin Scheineman  34 Donna Johnston  35 Jean Michaud  36 Shayna Zelcer  37 Robert Hammond  38 David A Ramsay  39 Adam J Fleming  40 Rishi R Lulla  41 Jason R Fangusaro  41 Nongnuch Sirachainan  42 Noppadol Larbcharoensub  43 Suradej Hongeng  42 Muhammad Abrar Barakzai  44 Alexandre Montpetit  5 Derek Stephens  45 Richard G Grundy  46 Ulrich Schüller  47 Theodore Nicolaides  48 Tarik Tihan  49 Joanna Phillips  50 Michael D Taylor  51 James T Rutka  51 Peter Dirks  51 Gary D Bader  52 Monika Warmuth-Metz  53 Stefan Rutkowski  54 Torsten Pietsch  55 Alexander R Judkins  56 Nada Jabado  57 Eric Bouffet  58 Annie Huang  59
Affiliations

Molecular subgroups of atypical teratoid rhabdoid tumours in children: an integrated genomic and clinicopathological analysis

Jonathon Torchia et al. Lancet Oncol. 2015 May.

Abstract

Background: Rhabdoid brain tumours, also called atypical teratoid rhabdoid tumours, are lethal childhood cancers with characteristic genetic alterations of SMARCB1/hSNF5. Lack of biological understanding of the substantial clinical heterogeneity of these tumours restricts therapeutic advances. We integrated genomic and clinicopathological analyses of a cohort of patients with atypical teratoid rhabdoid tumours to find out the molecular basis for clinical heterogeneity in these tumours.

Methods: We obtained 259 rhabdoid tumours from 37 international institutions and assessed transcriptional profiles in 43 primary tumours and copy number profiles in 38 primary tumours to discover molecular subgroups of atypical teratoid rhabdoid tumours. We used gene and pathway enrichment analyses to discover group-specific molecular markers and did immunohistochemical analyses on 125 primary tumours to evaluate clinicopathological significance of molecular subgroup and ASCL1-NOTCH signalling.

Findings: Transcriptional analyses identified two atypical teratoid rhabdoid tumour subgroups with differential enrichment of genetic pathways, and distinct clinicopathological and survival features. Expression of ASCL1, a regulator of NOTCH signalling, correlated with supratentorial location (p=0·004) and superior 5-year overall survival (35%, 95% CI 13-57, and 20%, 6-34, for ASCL1-positive and ASCL1-negative tumours, respectively; p=0·033) in 70 patients who received multimodal treatment. ASCL1 expression also correlated with superior 5-year overall survival (34%, 7-61, and 9%, 0-21, for ASCL1-positive and ASCL1-negative tumours, respectively; p=0·001) in 39 patients who received only chemotherapy without radiation. Cox hazard ratios for overall survival in patients with differential ASCL1 enrichment treated with chemotherapy with or without radiation were 2·02 (95% CI 1·04-3·85; p=0·038) and 3·98 (1·71-9·26; p=0·001). Integrated analyses of molecular subgroupings with clinical prognostic factors showed three distinct clinical risk groups of tumours with different therapeutic outcomes.

Interpretation: An integration of clinical risk factors and tumour molecular groups can be used to identify patients who are likely to have improved long-term radiation-free survival and might help therapeutic stratification of patients with atypical teratoid rhabdoid tumours.

Funding: C17 Research Network, Genome Canada, b.r.a.i.n.child, Mitchell Duckman, Tal Doron and Suri Boon foundations.

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