Synchronous occurrence of gastrointestinal stromal tumors and other primary gastrointestinal neoplasms

Table 1 Characteristics of the patient population

No.	Age	Sex	Synchronous malignancy	Clinical presentation
1	63	F	Colon cancer	Intestinal obstruction
2	77	F	Gastric lymphoma	Abdominal pain
3	64	F	Gastric cancer	Pyloric stenosis
4	66	M	Gastric cancer	Abdominal pain, weight loss

Table 2 Pathologic features of the synchronous GISTs and other primary gastrointestinal neoplasms

No.	GIST		Synchronous gastrointestinal malignancy
	Location	Size(cm)	Type	Location	Size(cm)
1	Anterior gastric wall (corpus)	2	Adenocarcinoma (pT4, N2, M0)	Cecum	10
2	Anterior gastric wall (fundus)	1	Lymphoma (diffuse large B cell)	Lesser curvature at the gastric angle	2
3	Anterior gastric wall (corpus)	2	Adenocarcinoma -Lauren diffuse type (pT4, N0, M0)	Antrum	5
4	Anterior gastric wall (corpus)	1	Adenocarcinoma -Lauren intestinal type (pT1, N0, M0)	Posterior wall at the gastric angle	1

Table 3 Histopathologic features of the synchronous GISTs

No.	CD117reactivity	CD34reactivity	Tumorsize(cm)	Mitoticindex	Risk category formalignant behavior[3]
1	+	+	2	2/50 hpf1	Low
2	+	+	1	0/50 hpf	Very low
3	+	+	2	2/50 hpf	Low
4	+	+	1	0/50 hpf	Very low

¹ High-power fields.