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Clinical Trial Summary

The incidence of brain metastases (BM) in metastatic breast cancer is increasing, due to the improvement in the control of systemic disease, and due to an improved detection through imagery.

The treatment management of single BM remains controversial. Indeed, even though it is widely accepted that local treatment increases the median survival time in patients having a good prognostic status, the adding of "adjuvant" whole-brain radiation therapy (WBRT) is currently subject to controversy, due to its potential toxicity. Yet, two randomized trials have demonstrated a clear increase in intra-cerebral recurrence and in death from neurologic origin in case of absence of "adjuvant" WBRT, without change in overall survival (but overall survival was not a primary endpoint in any of these studies).

The data from literature on cognitive toxicity (CT) of WBRT on BM are scarce and sometimes controversial. CT of WBRT affects the subcortical frontal functions. It is postulated that the alteration of hippocampal neurogenesis (mainly due to inflammation process), situated in the subgranular zone of the dentate gyrus, has an essential role in the development of these brain dysfunctions.

It has been shown that the incidence of BM in the hippocampal region (hippocampus + 5mm expansion) is low, in the range of 8,6%.

New irradiation techniques, in particular intensity-modulated radiotherapy associated with rotational radiotherapy, allow to modulate the dose on an intra-cerebral structure, all the while distributing an adapted dose to the remaining brain.

This prospective, randomized study, will compare, through a battery of neuropsychological tests, the cognitive impact of WBRT of 40 Gy in 20 fractions with or without hippocampal avoidance by intensity modulated radiotherapy, in patients presenting with a single operated brain metastasis of breast cancer. If the hippocampal avoidance leads to a significant improvement in cognitive function, this radiotherapy scheme could become the standard postoperative treatment to be proposed to patients presenting the best prognostic factors. This would allow to prevent long-term cognitive deficit, while preserving WBRT benefit on intra-cerebral control.

Justification of evaluation criteria :

Principal criteria :

Evaluation criteria to assess cognitive toxicity have been selected on the basis of the recommendations from C. Meyers and P. Brown, who propose an adapted test battery to evaluate memory, verbal function, visual and motor coordination, and executive function. The selected tests have been validated, also in French. They comprise HVLT-R (Hopkins Verbal Learning Test Revised), COWAT (Controlled Oral Word Association Test), Grooved Pegboard test, TMT A and B (Trailmaking tests A and B), and MMSE. The calculation of patient numbers was based on the HVLT-R test, as memory is thought to be the most frequently affected domain.

The tests will be performed before treatment ("baseline" cognitive function), at 4 months and at 12 months. In case of a missing answer to the evaluation tests, the reason(s) for not answering will be noted.

Secondary criteria :

Quality of life : QLQ-C30, QLQ-BN20, ADL, IADL Intra-cerebral Progression-free survival (PFS) Overall survival.


Clinical Trial Description

n/a


Study Design


Related Conditions & MeSH terms


NCT number NCT01942980
Study type Interventional
Source Institut Paoli-Calmettes
Contact
Status Completed
Phase Phase 3
Start date March 2013
Completion date June 6, 2017

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