Gastric mucosa-associated lymphoid tissue lymphomas and Helicobacter pylori infection: A Colombian perspective

Table 1 Definition of groups with respect to the presence of the API2-MALT1 rearrangement and response to treatment (n = 50)

Gastric maltlymphoma	Treatmentresponse	API2-MALT1positive	API2-MALT1negative
A group	Responders	0	33
B group	Non-responders	7
C group	Non-responders		10

MALT: Mucosa-associated lymphoid tissue.

Table 2 Histological and immunohistochemical characteristics of 50 cases of gastric mucosa-associated lymphoid tissue lymphoma n (%)

Features	Group			P value
	A	B	C	A vs B	A vs C	B vs C
n (%)	33 (66)	10 (20)	7 (14)
Large cells
Positive	8 (23.2)	0	0	> 0.05	> 0.05	NA
Negative	25 (75.8)	10 (100)	7 (100)
Centrocyte-like/small lymphocytes
Positive	16 (48.5)	6 (60)	7 (100)	> 0.05	< 0.05a	> 0.05
Negative	17 (51.5)	4 (40)	0
Monocytoid cells
Positive	8 (24.2)	3 (30)	0	> 0.05	> 0.05	> 0.05
Negative	25 (75.8)	7 (70)	7 (100)
Plasma cell differentiation
Positive	18 (54.5)	1(10)	1 (14.3)	< 0.05a	> 0.05	> 0.05
Negative	15 (45.5)	9 (90)	6 (85.7)
Residual follicles
Positive	5 (15.2)	2 (20)	0	> 0.05	> 0.05	> 0.05
Negative	28 (84.8)	8 (80)	7 (100)
Colonization follicles
Positive	6 (18.2)	3 (30)	1 (14.3)	> 0.05	> 0.05	> 0.05
Negative	27 (81.8)	7 (70)	6 (85.7)
Dutcher bodies
Positive	6 (18.2)	0	0	> 0.05	> 0.05	NA
Negative	27 (81.8)	10 (100)	7 (100)
B-cell lymphoma 10
Positive	0	10 (100)	7 (100)	< 0.05a	< 0.05a	NA
Negative	32 (100)	0	0

^aP < 0.05 is significant. NA: Not applicable.