Table 2 Histological and immunohistochemical findings in the tumor set of the study.

Cases	Diagnosis	RB1 expression	p53 expression	Mitotic count^a	Ki-67^a
S1	Typical carcinoid	Preserved	Patchy	1	6
S2	Typical carcinoid	Preserved	Patchy	1	3
S3	Typical carcinoid	Preserved	Patchy	1	1
S4	Atypical carcinoid	Preserved	Patchy	2	23
S5	Atypical carcinoid	Preserved	Patchy	4	9
S6	Atypical carcinoid	Preserved	Patchy	5	8
S7	Atypical carcinoid	Preserved	Patchy	5	10
S8	Borderline	Preserved	Patchy	13	18
S9	Borderline	Preserved	Patchy	14	23
S10	Borderline	Preserved	Patchy	17	15
S11	Borderline	Preserved	Patchy	26	58
S12	LCNEC	Preserved	Strong and diffuse	42	92
S13	LCNEC	Diminished	Patchy	54	87
S14	LCNEC	Loss	Loss	55	91
S15	LCNEC	Preserved	Patchy	64	75
S16	LCNEC	Preserved	Strong and diffuse	66	100
S17	LCNEC	Diminished	Strong and diffuse	107	90
S18	LCNEC	Loss	Strong and diffuse	128	94

^aThe mitotic count and the Ki-67 index are the mean of the scores provided by two evaluators and rounded to whole numbers.

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