CGH analysis of primary thymic squamous cell carcinoma. In primary thymic squamous cell carcinoma, the most frequent chromosomal losses were observed for 16q (six of nine cases, 67%), 6 (four of nine, 44%), 3p and 17p (three of nine each, 33%), whereas recurrent gains of chromosomal material were gains of 1q (five of nine, 56%), 17q and 18 (three of nine each, 33%). Bar on the left: loss of chromosomal material; bar on the right, gain of chromosomal material.