Table 2.

Listing of systemic tumor diseases.

Primary tumor entity	n (%)
Lung cancer	82 (39.8)
Breast cancer	19 (9.2)
Malignant melanoma	15 (7.3)
Cancer of unknown primary (CUP)	9 (4.4)
Gastrointestinal cancer	9 (4.4)
Squamous cell carcinoma	6 (2.9)
Thyroid cancer	5 (2.4)
Renal cell carcinoma	5 (2.4)
Other primary tumors	4 (1.9)
Gynecological tumor	3 (1.5)
Prostate cancer	3 (1.5)
Pseudoprogression	46 (22.3)
	Lung cancer 22 (47.8) Malignant melanoma 11 (23.9) Breast cancer 6 (13.0) Squamous cell carcinoma 3 (0.7) Other primary tumors 3 (0.7) Renal cell carcinoma 1 (0.2)
Total	206 (100)