Table 3. Causes of Ki-67 LI discrepancies between visual assessment and automated digital image analysis.

Cause of discrepancy	n (%)
Tumor heterogeneity	98 (56.0%)
Visual assessment interpretation error	32 (18.3%)
Misidentification of tumor cells	26 (14.9%)
Poor immunostaining or slide quality	16 (9.1%)
Non-tumor cells estimated	3 (1.7%)