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Table 6 Most frequently selected genes for the BRN dataset.

From: Differential prioritization between relevance and redundancy in correlation-based feature selection techniques for multiclass gene expression data

Rank

Annotation

Remarks

Group

1

TYR tyrosinase (oculocutaneous albinism IA)

Identified as marker for skin tumor class in [12]

M

2

FLJ20624 **hypothetical protein FLJ20624

Related to the gene PAK1, which is associated with pancreatic cancer [35]

1

3

DMXL1 Dmx-like 1

Function still unknown, although high level of conservation suggests important roles [36]

4

4

CLDN4 claudin 4

Identified as marker for ovarian, bladder, lung, and stomach tumor classes in [12]

M

5

TACSTD1 tumor-associated calcium signal transducer 1

Identified as marker for stomach, pancreatic, lung, and breast cancer classes in [12]

M

6

M6PR mannose-6-phosphate receptor (cation dependent)

Defective function of M6PR leads to hepatocellular carcinoma [37]

1

7

PLG plasminogen

Identified as marker for stomach cancer class in [12]

M

8

SPINT2 serine protease inhibitor, Kunitz type, 2

Found to be under-expressed in epithelial ovarian cancer patients [38]

1

9

SORD sorbitol dehydrogenase

Suppresses growth arrest induced by a p53 tumor mutant in fission yeast [39]

2

10

FGA fibrinogen, A alpha polypeptide

Mutation of FGA found in breast cancer patients [40]

1

11

BCL6 B-cell CLL/lymphoma 6 (zinc finger protein 51)

Deregulation of BCL6 found in diffuse large cell lymphoma [41]

1

12

APOH apolipoprotein H (beta-2-glycoprotein I)

Identified as marker for liver cancer class in [12]

M

13

PAX8 paired box gene 8

Verified as marker for ovarian cancer in [12], also identified as marker for renal and breast cancer classes in [12]

M

14

APCS amyloid P component, serum

Produces normal circulating plasma protein that is deposited on amyloid fibrils

4

15

S100A1 S100 calcium-binding protein A1

Identified as marker for breast, kidney, and ovary cancer classes in [12]

M

16

AMD1 S-adenosylmethionine decarboxylase 1

Specifically up-regulated in B cell lymphoma [42]

1

17

FABP1 fatty acid binding protein 1, liver

Identified as marker for pancreatic cancer class in [12]

M

18

HLCS holocarboxylase synthetase (biotin- [proprionyl-Coenzyme A-carboxylase (ATP-hydrolysing)] ligase)

The enzyme holocarboxylase synthetase plays a role in gene regulation (determining whether genes are turned on or off)

4

19

ITIH3 pre-alpha (globulin) inhibitor, H3 polypeptide

Its product is predominantly transcribed in liver, and is involved in pathological conditions such as tumor invasion and metastasis [43]

2

20

KRT18 keratin 18

Identified as marker for CNS (central nervous system) and stomach cancer classes in [12]

M

21

LGALS4 lectin, galactoside-binding, soluble, 4 (galectin 4)

Verified as marker for pancreatic cancer in [12], also identified as marker for stomach, liver, kidney, and breast cancer classes in [12]

M

22

HELO1 homolog of yeast long chain polyunsaturated fatty acid elongation enzyme 2

Highly expressed in adrenal gland and testis (tissue-specific), probably involved in encoding the major histocompatibility complex, essential to human immune response [44]

3

23

EST

Unknown sequence

4

24

QKI homolog of mouse quaking QKI (KH domain RNA binding protein)

Specifically expressed in the central nervous system (CNS)

3

25

NDP Norrie disease (pseudoglioma)

Regulates neural cell proliferation and differentiation. Norrie disease (caused by mutation of NDP) is also accompanied by intraocular tumor [45]

3

  1. Top 25 genes ranked from the most frequently selected genes for the BRN dataset. Group M: identified as a marker or repressor of a specific tumor type in originating study. Group 1: identified as a marker or repressor of a specific tumor type in other studies. Group 2: known to either promote or inhibit tumor in general. Group 3: tissue-specific genes. Group 4: unknown sequences and genes with either still-unidentified function or general housekeeping roles.