Evaluation of radiation dose to cardiac and pulmonary tissue among patients with stage IV Wilms tumor and pulmonary metastases.

Abstract:

BACKGROUND:Most patients with stage IV Wilms tumor (WT) and pulmonary metastases are treated with surgery, local radiotherapy (RT), and whole-lung irradiation (WLI). The Children's Oncology Group is studying whether WLI should only be given if metastatic lung lesions persist following induction chemotherapy. We hypothesized that radiation dose to cardiac and pulmonary organs are increased when WLI and abdominal RT fields are administered sequentially. PROCEDURE:We retrospectively identified 16 patients with stage IV WT and pulmonary metastases to model dosimetry plans for concurrent and sequential flank or whole abdomen and whole-lung fields. RESULTS:Treatment plans were evaluated for dosimetric endpoints to the heart and the lungs. The mean dose (Gy) was significantly higher to the heart (15.8 vs. 12.1, P < 0.0001) and lungs (14.1 vs. 12.2, P < 0.0002) when patients with stage IV WT and pulmonary metastases were treated with sequential RT. The percent tissue organ volumes (V) receiving high RT doses of 15 and 20 Gy (V(15) and V(20)) were negligible in concurrent treatment plans. Comparatively, mean V(15) and V(20) values for sequential treatment plans were 35% and 27%, respectively, for the heart, and 15% and 12%, for the lungs. CONCLUSIONS:The dose to the heart and lung tissue is significantly increased when WLI and abdominal RT fields are administered sequentially. While omission of WLI may be beneficial for patients achieving good response to induction chemotherapy, the less favorable response group may be subjected to increased risk of cardiac and pulmonary toxicities from sequential WLI.

journal_name

Pediatr Blood Cancer

journal_title

Pediatric blood & cancer

authors

Farooqi A,Siddiqi A,Khan MK,Esiashvili N

doi

10.1002/pbc.25007

subject

Has Abstract

pub_date

2014-08-01 00:00:00

pages

1394-7

issue

8

eissn

1545-5009

issn

1545-5017

journal_volume

61

pub_type

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