Correlation between gene methylation status and clinical features
Kidney Chromophobe (Primary solid tumor)
15 January 2014  |  analyses__2014_01_15
Maintainer Information
Citation Information
doi:10.7908/C1QJ7FR0
Maintained by Juok Cho (Broad Institute)
Cite as Broad Institute TCGA Genome Data Analysis Center (2014): Correlation between gene methylation status and clinical features. Broad Institute of MIT and Harvard. doi:10.7908/C1QJ7FR0
Overview
Introduction

This pipeline uses various statistical tests to identify genes whose promoter methylation levels correlated to selected clinical features.

Summary

Testing the association between 19761 genes and 10 clinical features across 66 samples, statistically thresholded by Q value < 0.05, 3 clinical features related to at least one genes.

  • 72 genes correlated to 'NEOPLASM.DISEASESTAGE'.

    • C20ORF46 ,  WTIP ,  FOXC1 ,  TASP1 ,  TSPYL5 ,  ...

  • 123 genes correlated to 'PATHOLOGY.M.STAGE'.

    • GRID1 ,  DOK5 ,  QRFPR ,  NPY ,  SHE ,  ...

  • 3 genes correlated to 'NUMBERPACKYEARSSMOKED'.

    • GRHL1 ,  LOC100133669 ,  LY6E

  • No genes correlated to 'Time to Death', 'AGE', 'PATHOLOGY.T.STAGE', 'PATHOLOGY.N.STAGE', 'GENDER', 'KARNOFSKY.PERFORMANCE.SCORE', and 'YEAROFTOBACCOSMOKINGONSET'.

Results
Overview of the results

Complete statistical result table is provided in Supplement Table 1

Table 1.  Get Full Table This table shows the clinical features, statistical methods used, and the number of genes that are significantly associated with each clinical feature at Q value < 0.05.

Clinical feature Statistical test Significant genes Associated with                 Associated with
Time to Death Cox regression test   N=0        
AGE Spearman correlation test   N=0        
NEOPLASM DISEASESTAGE ANOVA test N=72        
PATHOLOGY T STAGE Spearman correlation test   N=0        
PATHOLOGY N STAGE Spearman correlation test   N=0        
PATHOLOGY M STAGE ANOVA test N=123        
GENDER t test   N=0        
KARNOFSKY PERFORMANCE SCORE Spearman correlation test   N=0        
NUMBERPACKYEARSSMOKED Spearman correlation test N=3 higher numberpackyearssmoked N=3 lower numberpackyearssmoked N=0
YEAROFTOBACCOSMOKINGONSET Spearman correlation test   N=0        
Clinical variable #1: 'Time to Death'

No gene related to 'Time to Death'.

Table S1.  Basic characteristics of clinical feature: 'Time to Death'

Time to Death Duration (Months) 0.6-151.9 (median=63.9)
  censored N = 57
  death N = 8
     
  Significant markers N = 0
Clinical variable #2: 'AGE'

No gene related to 'AGE'.

Table S2.  Basic characteristics of clinical feature: 'AGE'

AGE Mean (SD) 51.52 (14)
  Significant markers N = 0
Clinical variable #3: 'NEOPLASM.DISEASESTAGE'

72 genes related to 'NEOPLASM.DISEASESTAGE'.

Table S3.  Basic characteristics of clinical feature: 'NEOPLASM.DISEASESTAGE'

NEOPLASM.DISEASESTAGE Labels N
  STAGE I 21
  STAGE II 25
  STAGE III 14
  STAGE IV 6
     
  Significant markers N = 72
List of top 10 genes differentially expressed by 'NEOPLASM.DISEASESTAGE'

Table S4.  Get Full Table List of top 10 genes differentially expressed by 'NEOPLASM.DISEASESTAGE'

ANOVA_P Q
C20ORF46 9.532e-12 1.88e-07
WTIP 8.711e-11 1.72e-06
FOXC1 1.253e-10 2.48e-06
TASP1 1.831e-10 3.62e-06
TSPYL5 1.895e-10 3.74e-06
FAM135B 1.64e-09 3.24e-05
ADCY1 2.902e-09 5.73e-05
C8ORF47 3.779e-09 7.46e-05
AQP5 7.714e-09 0.000152
CPNE9 1.201e-08 0.000237

Figure S1.  Get High-res Image As an example, this figure shows the association of C20ORF46 to 'NEOPLASM.DISEASESTAGE'. P value = 9.53e-12 with ANOVA analysis.

Clinical variable #4: 'PATHOLOGY.T.STAGE'

No gene related to 'PATHOLOGY.T.STAGE'.

Table S5.  Basic characteristics of clinical feature: 'PATHOLOGY.T.STAGE'

PATHOLOGY.T.STAGE Mean (SD) 2.02 (0.85)
  N
  1 21
  2 25
  3 18
  4 2
     
  Significant markers N = 0
Clinical variable #5: 'PATHOLOGY.N.STAGE'

No gene related to 'PATHOLOGY.N.STAGE'.

Table S6.  Basic characteristics of clinical feature: 'PATHOLOGY.N.STAGE'

PATHOLOGY.N.STAGE Mean (SD) 0.16 (0.47)
  N
  0 40
  1 3
  2 2
     
  Significant markers N = 0
Clinical variable #6: 'PATHOLOGY.M.STAGE'

123 genes related to 'PATHOLOGY.M.STAGE'.

Table S7.  Basic characteristics of clinical feature: 'PATHOLOGY.M.STAGE'

PATHOLOGY.M.STAGE Labels N
  M0 34
  M1 2
  MX 9
     
  Significant markers N = 123
List of top 10 genes differentially expressed by 'PATHOLOGY.M.STAGE'

Table S8.  Get Full Table List of top 10 genes differentially expressed by 'PATHOLOGY.M.STAGE'

ANOVA_P Q
GRID1 2.836e-31 5.6e-27
DOK5 1.608e-28 3.18e-24
QRFPR 2.36e-22 4.66e-18
NPY 1.474e-21 2.91e-17
SHE 2.153e-18 4.25e-14
TDRD10 2.153e-18 4.25e-14
CPNE9 4.402e-18 8.7e-14
FSTL3 3.435e-15 6.78e-11
KCTD15 9.744e-15 1.92e-10
ZNF880 8.056e-14 1.59e-09

Figure S2.  Get High-res Image As an example, this figure shows the association of GRID1 to 'PATHOLOGY.M.STAGE'. P value = 2.84e-31 with ANOVA analysis.

Clinical variable #7: 'GENDER'

No gene related to 'GENDER'.

Table S9.  Basic characteristics of clinical feature: 'GENDER'

GENDER Labels N
  FEMALE 27
  MALE 39
     
  Significant markers N = 0
Clinical variable #8: 'KARNOFSKY.PERFORMANCE.SCORE'

No gene related to 'KARNOFSKY.PERFORMANCE.SCORE'.

Table S10.  Basic characteristics of clinical feature: 'KARNOFSKY.PERFORMANCE.SCORE'

KARNOFSKY.PERFORMANCE.SCORE Mean (SD) 89.09 (9.4)
  Score N
  70 1
  80 2
  90 5
  100 3
     
  Significant markers N = 0
Clinical variable #9: 'NUMBERPACKYEARSSMOKED'

3 genes related to 'NUMBERPACKYEARSSMOKED'.

Table S11.  Basic characteristics of clinical feature: 'NUMBERPACKYEARSSMOKED'

NUMBERPACKYEARSSMOKED Mean (SD) 25.09 (22)
  Significant markers N = 3
  pos. correlated 3
  neg. correlated 0
List of 3 genes significantly correlated to 'NUMBERPACKYEARSSMOKED' by Spearman correlation test

Table S12.  Get Full Table List of 3 genes significantly correlated to 'NUMBERPACKYEARSSMOKED' by Spearman correlation test

SpearmanCorr corrP Q
GRHL1 0.9704 7.42e-07 0.0147
LOC100133669 0.9658 1.403e-06 0.0277
LY6E 0.9658 1.403e-06 0.0277

Figure S3.  Get High-res Image As an example, this figure shows the association of GRHL1 to 'NUMBERPACKYEARSSMOKED'. P value = 7.42e-07 with Spearman correlation analysis. The straight line presents the best linear regression.

Clinical variable #10: 'YEAROFTOBACCOSMOKINGONSET'

No gene related to 'YEAROFTOBACCOSMOKINGONSET'.

Table S13.  Basic characteristics of clinical feature: 'YEAROFTOBACCOSMOKINGONSET'

YEAROFTOBACCOSMOKINGONSET Mean (SD) 1973.75 (15)
  Significant markers N = 0
Methods & Data
Input

  • Expresson data file = KICH-TP.meth.by_min_clin_corr.data.txt

  • Clinical data file = KICH-TP.merged_data.txt

  • Number of patients = 66

  • Number of genes = 19761

  • Number of clinical features = 10

Survival analysis

For survival clinical features, Wald's test in univariate Cox regression analysis with proportional hazards model (Andersen and Gill 1982) was used to estimate the P values using the 'coxph' function in R. Kaplan-Meier survival curves were plot using the four quartile subgroups of patients based on expression levels

Correlation analysis

For continuous numerical clinical features, Spearman's rank correlation coefficients (Spearman 1904) and two-tailed P values were estimated using 'cor.test' function in R

ANOVA analysis

For multi-class clinical features (ordinal or nominal), one-way analysis of variance (Howell 2002) was applied to compare the log2-expression levels between different clinical classes using 'anova' function in R

Student's t-test analysis

For two-class clinical features, two-tailed Student's t test with unequal variance (Lehmann and Romano 2005) was applied to compare the log2-expression levels between the two clinical classes using 't.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.

References
[1] Andersen and Gill, Cox's regression model for counting processes, a large sample study, Annals of Statistics 10(4):1100-1120 (1982)
[2] Spearman, C, The proof and measurement of association between two things, Amer. J. Psychol 15:72-101 (1904)
[3] Howell, D, Statistical Methods for Psychology. (5th ed.), Duxbury Press:324-5 (2002)
[4] Lehmann and Romano, Testing Statistical Hypotheses (3E ed.), New York: Springer. ISBN 0387988645 (2005)
[5] 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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