Table 3.

Immunohistochemical scores by different authors

Author and score	Expression pattern and evaluation
Papotti et al. (2002)
-	negative
+	< 25% of tumor cells positive
++	25%-50% of tumor cells positive
+++	> 50% of tumor cells positive
Volante et al. (2007)	– only for SSTR2A
0	no immunoreactivity
1	only cytoplasmatic immunoreaction, focal or diffuse
2	membrane immunoreaction < 50%
3	membrane immunoreaction > 50%
Volante et al. (2007)	- for SSTR 3 and 5
positive	> 10% cytoplasmatic staining
Corleto et al. (2009)
0	no staining
+	mildly positive
++	moderately positive
+++	intensely positive
Miederer et al. (2009)	- for SSTR2A
0	negative
1+	mild incomplete membrane reaction
2+	moderate complete membrane reaction
3+	strong complete membrane reaction
Zamora et al. (2010)
Negative	no receptor expression
focally positive	< 25% of positive cells with heterogenous pattern
positive	> 25% of positive cells with moderate to strong density