Table 2.

Summary of the Presence of the Restricted 12p Amplification in the Different Development Stages of Testicular Germ Cell Tumors of Young Adults, as Determined by In Situ Hybridization on Frozen Tissue Sections

	Carcinoma in situ	Micro-invasive seminoma	Invasive tumor
n = 3	−	+	+ (SE)
n = 1	−	NA	+ (SE)
n = 1	−	NA	± (NS)
n = 1	−	±	± (CT)

Abbreviations: SE, seminoma; NS, nonseminoma; CT, combined tumor; NA, not available; −, absence of restricted 12p amplification; +, presence of restricted 12p- amplification; ±, heterogeneous presence of 12p amplification.