Radiotherapy for gastric mucosa-associated lymphoid tissue lymphoma

Table 1 Paris staging system

	Tumour extension
T1m N0 M0	Mucosa
T1sm N0 M0	Submucosa
T2 N0 M0	Muscularis propria
T3 N0 M0	Serosa
T1–3 N1 M0	Perigastric lymph nodes
T1–3 N2 M0	More distant regional nodes
T4 N0–2 M0	Invasion of adjacent structures with or without abdominal lymph nodes
T1–4 N3 M0	Extra-abdominal lymph nodes
T1–4 N0–3 M1	Distant (non-contiguous) GI sites involvement
T1–4 N0–3 M2	Non-GI sites involvement

T: Tumor; N: Nodes; M: Metastasis; GI: Gastrointestinal