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Table 3 Frequency distribution of the Patnaik’s classification system and Kiupel’s classification system in the three breeds with the highest occurrence of cutaneous mast cell tumor

From: Retrospective study of canine cutaneous tumors submitted to a diagnostic pathology laboratory in Northern Portugal (2014–2020)

BREEDS BOXER MIXED BREED LABRADOR RETRIEVER ALL BREEDS**
  n % n % n % n
PATNAIK’S CLASSIFICATION SYSTEM
GRADE I 10 28.06 4 6.78 8 13.11 29
GRADE II 22 62.86 38 64.40 41 67.21 146
GRADE III 3 8.57 17 28.81 12 19.67 50
NSC* 2   5   6   19
KIUPEL’S CLASSIFICATION SYSTEM
LOW GRADE 21 84.0 28 66.67 33 78.57 111
HIGH GRADE 4 16.0 14 33.33 9 21.43 45
NSC* 12   22   25   88
TOTAL 37 64 67 244
  1. *NSC not subjected to this classification system and excluded from the % within breed for each grade
  2. ** Includes all diagnosed MCTs in the sample population (n = 244; Patnaik’s = 225; Kiupel’s = 156; both systems = 137), regardless of breed