Table 1.
Scoring method chosen for the evaluation of immunohistochemistry.
| Grade 0 | Grade 1 | Grade 2 | Grade 3 | |
|---|---|---|---|---|
| Fibronectin (cytoplasm) | Negative | Weak, focal | Weak, diffuse | Strong, diffuse |
| CX43 (cytoplasm) | Negative | Scattered positivity | Patchy positivity | Diffuse positivity |
| CX43 (ID and along LCB) | Negative | Thin linear and intermittent positivity | Dense but intermittent positivity | Dense band-like positivity |
| NPCX43 (cytoplasm) | Negative | Scattered positivity | Patchy positivity | Diffuse positivity |
| CX43 (ID and along LCB) | Negative | Thin linear and intermittent positivity | Dense but intermittent positivity | Dense band-like positivity |
| ZO1 (cytoplasm) | Negative | Weak and patchy | Dense but patchy positivity | Diffuse positivity |
ID, intercalated discs; LCB, longitudinal cell membrane.