Prescreening based on the presence of CT-scan abnormalities and biomarkers (KL-6 and SP-D) may reduce severe radiation pneumonitis after stereotactic radiotherapy

Table 1 Characteristics of the tumor

Subject	N	(%)
Biopsy proved primary lung cancer	60	51
cT1N0M0	39	33
cT2N0M0	19	16
the others	2	2
Unconfirmed histology (suspected of primary lung cancer)	14	12
Metastatic or recurrent lung cancer	43	37
Total	117	100

ISSN: 1748-717X