Score

Proportion

Score 0

No cell stained.

Score 1+

>0 to 1/100 of cells stained.

Score 2+

>1/100 to 1/10 of cells stained.

Score 3+

>1/10 to 1/3 of cells stained.

Score 4+

>1/3 to 2/3 of cells stained.

Score 5+

>2/3 to 1/1 of cells stained.