High external parametrial dose can increase the probability of radiation proctitis in patients with uterine cervix cancer.

Abstract:

OBJECTIVE:The aim of this study was to evaluate the relationship between external parametrial dose and radiation proctitis after external irradiation and high-dose-rate intracavitary (HDR-IC) brachytherapy among patients with cervical cancer. METHODS:From May 1993 through December 1996, 191 patients with stage IB-IVA cervical cancer were managed by curative-intent radiotherapy. External irradiation to the whole pelvis (44-45 Gy/ 22-25 fractions) was delivered to all patients initially. One hundred twenty-seven patients received additional bilateral parametrial and sidewall boost (5.4-14.4 Gy/ 3-8 fractions) with 4-cm midline shielding. HDR-IC brachytherapy, 19.2-24 Gy/ 5 fractions to Point A, was given after external irradiation. Patients receiving an external dose of 44-45, 50-54, and >54 Gy were categorized as no parametrial boost (NPMB), low parametrial boost (LPMB), and high parametrial boost (HPMB) group, respectively. The actuarial proctitis rate was compared among the three groups. RESULTS:Three-year overall and Grade 2-4 proctitis rates were 30 and 15%, respectively. Overall proctitis rates were 12, 34, and 51% in the NPMB, LPMB, and HPMB groups (P < 0.0001), respectively. Grade 2-4 proctitis rates were 5, 17, and 27% in the NPMB, LPMB, and HPMB groups (P = 0.0022), respectively. In multivariate analysis of overall and Grade 2-4 radiation proctitis, external parametrial dose was the only independent prognostic factor (P = 0.0002 and 0.0030, respectively). CONCLUSION:Regardless of central shielding after 44-45 Gy whole pelvis irradiation, more patients with high external parametrial dose developed radiation proctitis. Incomplete midline shielding of the upper rectum may be the cause. Diminishing the external beam doses further may decrease rectal complications.

journal_name

Gynecol Oncol

journal_title

Gynecologic oncology

authors

Huang EY,Lin H,Hsu HC,Wang CJ,Chen HC,Sun LM,Hsiung CY

doi

10.1006/gyno.2000.5997

subject

Has Abstract

pub_date

2000-12-01 00:00:00

pages

406-10

issue

3

eissn

0090-8258

issn

1095-6859

pii

S0090-8258(00)95997-3

journal_volume

79

pub_type

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