Thyroid Adenocarcinoma: Correlation between copy number variation genes and selected clinical features

Maintained by TCGA GDAC Team (Broad Institute/Dana-Farber Cancer Institute/Harvard Medical School)

Overview

Introduction

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

Summary

Testing the association between copy number variation of 11 peak regions and 6 clinical features across 206 patients, one significant finding detected with Q value < 0.25.

Del Peak 9(10q23.31) cnvs correlated to 'HISTOLOGICAL.TYPE'.

Results

Overview of the results

Table 1. Get Full Table Overview of the association between significant copy number variation of 11 regions and 6 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	GENDER	HISTOLOGICAL TYPE	RADIATIONS RADIATION REGIMENINDICATION	NEOADJUVANT THERAPY
	nCNV (%)	nWild-Type	logrank test	t-test	Fisher's exact test	Fisher's exact test	Fisher's exact test	Fisher's exact test
Del Peak 9(10q23 31)	7 (3%)	199	1 (1.00)	0.0531 (1.00)	0.377 (1.00)	0.0021 (0.139)	1 (1.00)	1 (1.00)
Del Peak 2(2p22 3)	8 (4%)	198	1 (1.00)	0.154 (1.00)	0.683 (1.00)	0.217 (1.00)	1 (1.00)	1 (1.00)
Del Peak 3(2q37 2)	7 (3%)	199	1 (1.00)	0.00831 (0.532)	0.68 (1.00)	0.00693 (0.45)	1 (1.00)	1 (1.00)
Del Peak 4(6q22 31)	4 (2%)	202	0.0143 (0.887)	0.196 (1.00)	1 (1.00)	0.793 (1.00)	0.247 (1.00)	1 (1.00)
Del Peak 6(8q24 22)	4 (2%)	202	1 (1.00)	0.0353 (1.00)	0.273 (1.00)	0.147 (1.00)	1 (1.00)	1 (1.00)
Del Peak 8(9q22 32)	5 (2%)	201	1 (1.00)	0.0402 (1.00)	1 (1.00)	0.181 (1.00)	0.299 (1.00)	1 (1.00)
Del Peak 10(13q21 1)	10 (5%)	196	0.0143 (0.887)	0.407 (1.00)	0.72 (1.00)	0.0667 (1.00)	0.141 (1.00)	1 (1.00)
Del Peak 14(17p13 1)	3 (1%)	203	1 (1.00)	0.846 (1.00)	0.571 (1.00)	0.55 (1.00)	0.0124 (0.783)	1 (1.00)
Del Peak 16(22q13 2)	39 (19%)	167	0.683 (1.00)	0.954 (1.00)	1 (1.00)	0.444 (1.00)	0.477 (1.00)	1 (1.00)
Del Peak 17(22q13 31)	39 (19%)	167	0.683 (1.00)	0.954 (1.00)	1 (1.00)	0.444 (1.00)	0.477 (1.00)	1 (1.00)
Del Peak 18(Xq22 3)	3 (1%)	203	1 (1.00)	0.137 (1.00)	0.163 (1.00)	0.0914 (1.00)	1 (1.00)	1 (1.00)

'Del Peak 9(10q23.31) mutation analysis' versus 'HISTOLOGICAL.TYPE'

P value = 0.0021 (Fisher's exact test), Q value = 0.14

Table S1. Gene #6: 'Del Peak 9(10q23.31) mutation analysis' versus Clinical Feature #4: 'HISTOLOGICAL.TYPE'

nPatients	OTHER	THYROID PAPILLARY CARCINOMA - CLASSICAL/USUAL	THYROID PAPILLARY CARCINOMA - FOLLICULAR (>= 99% FOLLICULAR PATTERNED)	THYROID PAPILLARY CARCINOMA - TALL CELL (>= 50% TALL CELL FEATURES)
ALL	8	115	61	22
DEL PEAK 9(10Q23.31) MUTATED	1	0	6	0
DEL PEAK 9(10Q23.31) WILD-TYPE	7	115	55	22

Figure S1. Get High-res Image Gene #6: 'Del Peak 9(10q23.31) mutation analysis' versus Clinical Feature #4: 'HISTOLOGICAL.TYPE'

Methods & Data

Input

Copy number data file = All Lesions File (all_lesions.conf_##.txt, where ## is the confidence level). The all lesions file is from GISTIC pipeline and summarizes the results from the GISTIC run. It contains data about the significant regions of amplification and deletion as well as which samples are amplified or deleted in each of these regions. The identified regions are listed down the first column, and the samples are listed across the first row, starting in column 10.
Clinical data file = THCA.clin.merged.picked.txt
Number of patients = 206
Number of copy number variation regions = 11
Number of selected clinical features = 6
Exclude regions that fewer than K tumors have alterations, K = 3

Survival analysis

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

Student's t-test analysis

For continuous numerical clinical features, two-tailed Student's t test with unequal variance (Lehmann and Romano 2005) was applied to compare the clinical values between tumors with and without gene cnvs using 't.test' 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

This is an experimental feature. The full results of the analysis summarized in this report can be downloaded from the TCGA Data Coordination Center.

References

[1] Bland and Altman, Statistics notes: The logrank test, BMJ 328(7447):1073 (2004)

[2] Lehmann and Romano, Testing Statistical Hypotheses (3E ed.), New York: Springer. ISBN 0387988645 (2005)

[3] 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)

[4] 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)

[5] GISTIC_version2

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