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Table 2 Log-rank test for factors associated with improvement after observation.

From: Treatment and prognosis of patients with late rectal bleeding after intensity-modulated radiation therapy for prostate cancer

Factors Groups (number of patients) Response rate at 1 year (%) P value
Age ≥ 71 (25)/≤ 70 (20) 54/35 0.12
IMRT method Linac (30)/Tomotherapy (15) 20/100 0.009
Use of ADT Yes (35)/No (10) 44/17 0.56
Use of antithrombotics Yes (26)/No (14) 61/49 0.66
Presence of DM Yes (6)/No (38) 67/42 0.37
Rectal %V40Gy ≥ 35.0% (27)/< 35.0% (17) 50/35 0.80
Rectal %V70Gy ≥ 8.1% (25)/< 8.1% (19) 33/65 0.005
  1. ADT, androgen deprivation therapy; DM, diabetes mellitus. Rectal %V40/%70 Gy, % of rectum volume receiving ≥ 40 or 70 Gy.