Table 1.

Criteria utilized to assess the malignancy of tumors with behavior code /1.

Diagnosis	Malignancy Category
Canine cutaneous MCT [25,26] all grades	Malignant
Feline cutaneous MCT [27]  Without malignancy description  With some malignancy description	Benign Malignant
Subcutaneous MCT [26,28] all pattern descriptions	Benign
Meibomian gland epithelioma	Malignant [29]
All other /1 morphologies  Without malignancy description  With some malignancy description	Benign Malignant
Morphologies undefined (M800) #	Not included in the analysis

MCT: mast cell tumors; ^# M800: Vet-ICD-O-canine group for Neoplasm, NOS (not otherwise specified).