Correlation between copy number variation genes (focal events) and selected clinical features
Mesothelioma (Primary solid tumor)
17 October 2014 | analyses__2014_10_17
Maintainer Information
Citation Information
doi:10.7908/C12R3QKQ
Maintained by TCGA GDAC Team (Broad Institute/MD Anderson Cancer Center/Harvard Medical School)
Cite as Broad Institute TCGA Genome Data Analysis Center (2014): Correlation between copy number variation genes (focal events) and selected clinical features. Broad Institute of MIT and Harvard. doi:10.7908/C12R3QKQ
Overview
Introduction

This pipeline computes the correlation between significant copy number variation (cnv focal) genes and selected clinical features.

Summary

Testing the association between copy number variation 21 focal events and 7 clinical features across 39 patients, one significant finding detected with Q value < 0.25.

- del_10p15.3 cnv correlated to 'Time to Death'.

Results
Overview of the results

Table 1. Get Full Table Overview of the association between significant copy number variation of 21 focal events and 7 clinical features. Shown in the table are P values (Q values). Thresholded by Q value < 0.25, one significant finding detected.

|  | Clinical Features | Time to Death | AGE | NEOPLASM DISEASESTAGE | PATHOLOGY T STAGE | PATHOLOGY N STAGE | PATHOLOGY M STAGE | GENDER
| nCNV (%) | nWild-Type | logrank test | Wilcoxon-test | Fisher's exact test | Fisher's exact test | Fisher's exact test | Fisher's exact test | Fisher's exact test
del 10p15 3 | 13 (33%) | 26 | 6.9e-06 (0.00101) | 0.56 (1.00) | 0.0296 (1.00) | 0.0028 (0.409) | 0.182 (1.00) | 0.553 (1.00) | 0.704 (1.00)
del 1p36 31 | 18 (46%) | 21 | 0.0419 (1.00) | 0.344 (1.00) | 0.266 (1.00) | 0.633 (1.00) | 0.775 (1.00) | 0.489 (1.00) | 1 (1.00)
del 1p21 3 | 18 (46%) | 21 | 0.855 (1.00) | 0.265 (1.00) | 0.105 (1.00) | 0.0794 (1.00) | 0.517 (1.00) | 0.22 (1.00) | 1 (1.00)
del 2q35 | 7 (18%) | 32 | 0.0484 (1.00) | 0.634 (1.00) | 0.501 (1.00) | 0.646 (1.00) | 0.212 (1.00) | 0.714 (1.00) | 0.00706 (1.00)
del 3p21 1 | 25 (64%) | 14 | 0.644 (1.00) | 0.379 (1.00) | 0.911 (1.00) | 0.2 (1.00) | 0.672 (1.00) | 1 (1.00) | 0.446 (1.00)
del 4q26 | 20 (51%) | 19 | 0.118 (1.00) | 0.778 (1.00) | 0.127 (1.00) | 0.308 (1.00) | 0.679 (1.00) | 0.182 (1.00) | 0.273 (1.00)
del 4q34 3 | 22 (56%) | 17 | 0.175 (1.00) | 0.192 (1.00) | 0.12 (1.00) | 0.914 (1.00) | 0.872 (1.00) | 0.093 (1.00) | 0.464 (1.00)
del 5q23 2 | 8 (21%) | 31 | 0.165 (1.00) | 0.113 (1.00) | 1 (1.00) | 0.343 (1.00) | 1 (1.00) | 0.207 (1.00) | 0.0862 (1.00)
del 6q22 1 | 20 (51%) | 19 | 0.469 (1.00) | 0.866 (1.00) | 0.311 (1.00) | 0.762 (1.00) | 0.21 (1.00) | 0.226 (1.00) | 0.155 (1.00)
del 6q26 | 17 (44%) | 22 | 0.912 (1.00) | 0.966 (1.00) | 0.38 (1.00) | 0.833 (1.00) | 0.059 (1.00) | 0.681 (1.00) | 1 (1.00)
del 8p23 2 | 7 (18%) | 32 | 0.0685 (1.00) | 0.521 (1.00) | 0.156 (1.00) | 0.0389 (1.00) | 0.276 (1.00) | 0.54 (1.00) | 0.653 (1.00)
del 9p21 3 | 25 (64%) | 14 | 0.00828 (1.00) | 0.837 (1.00) | 0.86 (1.00) | 0.202 (1.00) | 0.244 (1.00) | 0.077 (1.00) | 0.446 (1.00)
del 10q25 2 | 16 (41%) | 23 | 0.0993 (1.00) | 0.627 (1.00) | 0.955 (1.00) | 0.52 (1.00) | 0.206 (1.00) | 0.387 (1.00) | 0.711 (1.00)
del 11q23 2 | 8 (21%) | 31 | 0.0137 (1.00) | 0.958 (1.00) | 0.18 (1.00) | 0.506 (1.00) | 1 (1.00) | 1 (1.00) | 0.0862 (1.00)
del 12p13 31 | 6 (15%) | 33 | 0.406 (1.00) | 0.785 (1.00) | 0.452 (1.00) | 0.845 (1.00) | 0.796 (1.00) | 1 (1.00) | 1 (1.00)
del 13q14 11 | 23 (59%) | 16 | 0.483 (1.00) | 0.317 (1.00) | 0.83 (1.00) | 1 (1.00) | 0.0288 (1.00) | 0.033 (1.00) | 0.264 (1.00)
del 14q32 31 | 19 (49%) | 20 | 0.306 (1.00) | 0.778 (1.00) | 0.249 (1.00) | 1 (1.00) | 0.88 (1.00) | 0.284 (1.00) | 0.155 (1.00)
del 15q15 1 | 14 (36%) | 25 | 0.098 (1.00) | 0.93 (1.00) | 0.0931 (1.00) | 1 (1.00) | 1 (1.00) | 0.266 (1.00) | 0.721 (1.00)
del 16p13 3 | 5 (13%) | 34 | 0.339 (1.00) | 0.0882 (1.00) | 0.0951 (1.00) | 0.0142 (1.00) | 1 (1.00) | 1 (1.00) | 0.587 (1.00)
del 16q24 1 | 13 (33%) | 26 | 0.0136 (1.00) | 0.303 (1.00) | 0.9 (1.00) | 0.906 (1.00) | 0.868 (1.00) | 0.447 (1.00) | 0.704 (1.00)
del 22q12 2 | 32 (82%) | 7 | 0.507 (1.00) | 0.687 (1.00) | 0.443 (1.00) | 0.214 (1.00) | 0.683 (1.00) | 0.377 (1.00) | 1 (1.00)

'del_10p15.3' versus 'Time to Death'

P value = 6.9e-06 (logrank test), Q value = 0.001

Table S1. Gene #12: 'del_10p15.3' versus Clinical Feature #1: 'Time to Death'

| nPatients | nDeath | Duration Range (Median), Month
--- | --- | --- | ---
ALL | 39 | 29 | 0.2 - 91.7 (13.3)
DEL PEAK 12(10P15.3) MUTATED | 13 | 11 | 0.2 - 17.3 (4.7)
DEL PEAK 12(10P15.3) WILD-TYPE | 26 | 18 | 1.6 - 91.7 (18.4)

Figure S1. Get High-res Image Gene #12: 'del_10p15.3' versus Clinical Feature #1: 'Time to Death'

Methods & Data
Input

- Copy number data file = transformed.cor.cli.txt

- Clinical data file = MESO-TP.merged_data.txt

- Number of patients = 39

- Number of significantly focal cnvs = 21

- Number of selected clinical features = 7

- Exclude genes that fewer than K tumors have mutations, K = 3

Survival analysis

For survival clinical features, the Kaplan-Meier survival curves of tumors with and without gene mutations were plotted and the statistical significance P values were estimated by logrank test (Bland and Altman 2004) using the 'survdiff' function in R

Fisher's exact test

For binary or multi-class clinical features (nominal or ordinal), two-tailed Fisher's exact tests (Fisher 1922) were used to estimate the P values using the 'fisher.test' function in R

Q value calculation

For multiple hypothesis correction, Q value is the False Discovery Rate (FDR) analogue of the P value (Benjamini and Hochberg 1995), defined as the minimum FDR at which the test may be called significant. We used the 'Benjamini and Hochberg' method of 'p.adjust' function in R to convert P values into Q values.

Download Results

In addition to the links below, the full results of the analysis summarized in this report can also be downloaded programmatically using firehose_get, or interactively from either the Broad GDAC website or TCGA Data Coordination Center Portal.

- Analysis Results (MD5 checksum)

- Auxiliary Data (MD5 checksum)

- MAGE-TAB File (MD5 checksum)

References
[1] Bland and Altman, Statistics notes: The logrank test, BMJ 328(7447):1073 (2004)
[2] Fisher, R.A., On the interpretation of chi-square from contingency tables, and the calculation of P, Journal of the Royal Statistical Society 85(1):87-94 (1922)
[3] Benjamini and Hochberg, Controlling the false discovery rate: a practical and powerful approach to multiple testing, Journal of the Royal Statistical Society Series B 59:289-300 (1995)
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