Interfractional Variations of Tumor Centroid Position and Tumor Regression during Stereotactic Body Radiotherapy for Lung Tumor

Table 1

Baseline characteristics of patients and tumors.

Factors	Number of patients	Patient (%)
Gender
Male	21	61.8
Female	13	38.2
Age (year)
<60	18	52.9
≥60	16	47.1
Lung tumor
Primary lung tumor		47.1
I A	1	2.9
I B	4	11.8
IV	11	32.4
^*Recurrence of lung tumor	4	11.8
Metastatic lung tumor	14	41.2
Tumor size (cm)
<3.0	19	55.9
≥3.0 and ≤5.0	15	44.1
Primary site of tumor
Lung	20	58.8
Colon	4	11.8
Esophagus	4	11.8
Head and neck	3	8.7
Breast	1	2.9
Cervix	1	2.9
Thymus	1	2.9
Histologic classification
Squamous cell carcinoma	14	41.2
Adenocarcinoma	13	38.2
Small cell carcinoma	1	2.9
Adenoid cystic carcinoma	1	2.9
NOS	5	14.7
Type of lung tumor
Central	11	32.4
Peripheral	23	67.6
Location of lung tumor
Left upper lobe	12	35.3
Left lower lobe	7	20.6
Right upper lobe	7	20.6
Right middle lobe	4	11.8
Right lower lobe	4	11.8
Previous treatment
Chemotherapy	7	20.6
Conventional radiotherapy	5	14.7
No	22	64.7

NOS = not otherwise specified.
^*Recurrence of lung tumor means that lung tumor relapses after complete surgical resection.