Factors investigated

Recurrence (n = 14)

No recurrence (n = 9)

p value

Age

≥Median

≤Median

9

5

5

4

0.516

White blood cell

≥Median

≤Median

4

4

8

6

0.307

CRP

Normal

abnormal

1

12

4

5

0.044*

CRP

Normal/borderline high

1

11

5

5

<0.01*

Boost

Yes

No

6

8

6

3

0.529

Maximum lung depth

≥Median

7

4

7

3

0.411

Hormone therapy

Yes

No

10

4

8

1

0.495

Chemotherapy

Yes

No

4

10

0

9

0.333

RIOP ratio in the whole lung

Yes

No

8

6

4

5

0.493

Corticosteroids

Yes

No

11

3

6

3

0.658

Methylprednisolone

Yes

No

5

6

1

5

<0.01*

Prednisolone dose reduction rate

≥Median

≤Median

5

5

4

2

0.274