Analysis Overview for Sarcoma<BR>(primary solid tumor cohort)

Analysis Overview for Sarcoma
(primary solid tumor cohort)

Maintained by TCGA GDAC Team (Broad Institute/MD Anderson Cancer Center/Harvard Medical School)

Overview

Introduction

This is the analysis overview for Firehose run "26 March 2013".

Summary

Note: These results are offered to the community as an additional reference point, enabling a wide range of cancer biologists, clinical investigators, and genome and computational scientists to easily incorporate TCGA into the backdrop of ongoing research. While every effort is made to ensure that Firehose input data and algorithms are of the highest possible quality, these analyses have not been reviewed by domain experts.

Results

Sequence and Copy Number Analyses

Copy number analysis (GISTIC2)
View Report | There were 51 tumor samples used in this analysis: 12 significant arm-level results, 13 significant focal amplifications, and 27 significant focal deletions were found.

Clustering Analyses

Clustering of copy number data by focal peak region with log2 ratio: consensus NMF
View Report | The most robust consensus NMF clustering of 51 samples using the 40 copy number focal regions was identified for k = 3 clusters. We computed the clustering for k = 2 to k = 8 and used the cophenetic correlation coefficient to determine the best solution.
Clustering of Methylation: consensus NMF
View Report | The 12998 most variable methylated genes were selected based on variation. The variation cutoff are set for each tumor type empirically by fitting a bimodal distriution. For genes with multiple methylation probes, we chose the most variable one to represent the gene. Consensus NMF clustering of 52 samples and 12998 genes identified 3 subtypes with the stability of the clustering increasing for k = 2 to k = 8 and the average silhouette width calculation for selecting the robust clusters.
Clustering of miRseq precursor expression: consensus NMF
View Report | We filtered the data to 150 most variable miRs. Consensus NMF clustering of 29 samples and 150 miRs identified 2 subtypes with the stability of the clustering increasing for k = 2 to k = 8 and the average silhouette width calculation for selecting the robust clusters.
Clustering of miRseq precursor expression: consensus hierarchical
View Report | We filtered the data to 150 most variable miRs. Consensus average linkage hierarchical clustering of 29 samples and 150 miRs identified 3 subtypes with the stability of the clustering increasing for k = 2 to k = 8 and the average silhouette width calculation for selecting the robust clusters.

Correlation Analyses

Correlation between copy number variations of arm-level result and molecular subtypes
View Report | Testing the association between copy number variation 65 arm-level results and 4 molecular subtypes across 51 patients, no significant finding detected with Q value < 0.25.
Correlation between copy number variation genes and molecular subtypes
View Report | Testing the association between copy number variation of 40 peak regions and 4 molecular subtypes across 51 patients, 8 significant findings detected with Q value < 0.25.

Methods & Data

Input

Run Prefix = analyses__2013_03_26
Summary Report Date = Sat Apr 20 08:45:32 2013
Protection = FALSE

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