Table 1.

Histoscore Method for Immunohistochemical Expression

Percentage of positivity	Score	Staining intensity	Score
< 1% positive cells	0	No staining	0
1% - 25% positive cells	1	Weak staining	1
26% - 50% positive cells	2	Moderate staining	2
51% - 75% positive cells	3	Strong staining	3
≥ 75% positive cells	4

Final histoscore, Percent positivity score x Staining intensity score; Score : 0, Negative; 1 – 3/12, Low expression; ≥ 4/12, High expression