MKI67 and lymphoma: Given that pathology is the gold standard for diagnosing lymphoma, we used Passing-Bablock regression analysis as a statistical method to analyze the agreement between the positive expression of Ki67 detected by MFC and the proliferation index of Ki67 detected by pathological immunohistochemistry.The Passing–Bablock linear regression analysis showed a good agreement between the two methods regardless of sample type (Figure 5A).