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

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

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

^*NSC not subjected to this classification system and excluded from the % within breed for each grade
^** Includes all diagnosed MCTs in the sample population (n = 244; Patnaik’s = 225; Kiupel’s = 156; both systems = 137), regardless of breed

ISSN: 2662-9380