Table 4 Correlation of expression of PDL1/PD-1 in OSCC and oral leukoplakia.

PDL1 positive epithelial cells (labelling index)

 Pearson correlation

1

0.544

 Sig (2 tailed)

0.005

 N

25

25

PD1 positive lymphocytes (labelling index)

 Pearson correlation

0.544

1

 Sig (2 tailed)

0.005

 N

25

25

PD1 positive lymphocytes (H score)

 Pearson correlation

1

0.606

 Sig (2 tailed)

0.001

 N

25

25

PDL1 positive epithelial cells (H score)

 Pearson correlation

0.606

1

 Sig (2 tailed)

0.001

 N

25

25

PDL1 positive TAFs (labelling index)

 Pearson correlation

1

0.358

 Sig (2 tailed)

0.079

 N

25

25

PD1 positive lymphocytes (labelling index)

 Pearson correlation

0.358

1

 Sig (2 tailed)

0.079

 N

25

25