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DE-CT in Lung Cancer Proton Therapy (DE-CT)

13. april 2017 opdateret af: Maastricht Radiation Oncology

DE-CT vs. SE-CT as Optimal Imaging During Treatment for Adaptive Proton Therapy in Stage III Non Small Cell Lung Cancer (NSCLC)

Dose distribution calculations for proton therapy are more accurate when based on DE-CT than on SE-CT. It is however unclear what the quantitative benefit of repeated DE-CT calculations is for lung cancer patients.

Studieoversigt

Status

Trukket tilbage

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

In order to calculate the dose distribution of protons adequately, accurate estimations of the stopping power ratio (SPR) medium to water, are required. Using a conversion from single energy CT (SE-CT) images results in an uncertainty in the SPR of at least 3-4%. This uncertainty results in in the use of larger margins around the clinical target volume (CTV) and hence more dose to the organs at risk (OAR). It also effects in the conservative use of beam directions, which are often sub-optimal, to avoid irradiating normal tissues.

Dual energy CT (DE-CT) improves the accuracy of the SPR and therefore the proton range estimation.

An evaluation of the proton range for several tissues using SE-CT and DE-CT as input to Monte Carlo (MC) simulations showed on average improvements in range prediction from 0.1% to 2.1% when using DECT instead of SECT, but in several phantoms and also versus proton-CT, the errors on SE-CT based proton stopping power ratios are reported to be more than 7 %.

A limitation of these studies is that most of them were performed in phantoms. In the first clinical data set on five patients with base of skull tumours, it was reported that although the SPR estimation was indeed better for DE-CT than for SE-CT, its clinical relevance was unclear. However, in the same study, phantom measurements showed a large uncertainty of the SPR in the lung. This is due to the large heterogeneity of the lungs and the huge difference in the density of the lungs compared to the mediastinum, the tumour and the chest cavity.

It is therefore important to study the SPR differences of SE-CT compared to DE-CT in lung cancer patients and the impact on the dose distribution especially in the context of adaptive radiotherapy. As during the course of concurrent chemotherapy and radiotherapy, which is the standard treatment in the majority of stage III lung cancer patients, important anatomical changes may occur, it is also of clinical relevance to determine the influence of repeated dose calculations on DE-CT.

Undersøgelsestype

Interventionel

Fase

  • Ikke anvendelig

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

  • Holland
    • Limburg
      • Maastricht, Limburg, Holland, 6229 ET
        • Maastro Clinic

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

18 år og ældre (Voksen, Ældre voksen)

Tager imod sunde frivillige

Ingen

Køn, der er berettiget til at studere

Alle

Beskrivelse

Inclusion Criteria:

  • Histologically or cytologically confirmed locally advanced stage IIIA or III B (T0-4 N2-3M0) NSCLC, or M1 oligometastatic disease according to 7th TNM classification.
  • Scheduled to receive concurrent chemotherapy and radiotherapy to a dose of at least 60 Gy, as decided at the multidisciplinary tumour board
  • Able to give written informed consent
  • Able to have adequate contraception in woman with child bearing potential

Exclusion Criteria:

  • Not able to give written informed consent
  • Not able to comply with adequate contraception in woman with child bearing potential

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Andet
  • Tildeling: N/A
  • Interventionel model: Enkelt gruppeopgave
  • Maskning: Ingen (Åben etiket)

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Eksperimentel: Scans
Patients included in the trial will receive DE-CT in stead of SE-CT's.
Procedure: DE-CT's and SE-CT
Patients included in the trial will receive 3 extra DE-CT's and 3 extra SE-CT's

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Dose distribution on the CTV (measured in Gy)
Tidsramme: Measured during 2nd and 4th week of radiation treatment
Dose distribution on the CTV (clinical target volume) of the tumour and the lymph nodes of DE-CT vs. SE-CT
Measured during 2nd and 4th week of radiation treatment
Dose distribution on the OAR (measured in Gy)
Tidsramme: Measured during 2nd and 4th week of radiation treatment
Dose distribution on the OAR (organs at risk), lungs, heart, aorta, pulmonary artery, superior vena cava, oesophagus, spinal cord, vertebral body, of DE-CT vs. SE-CT
Measured during 2nd and 4th week of radiation treatment

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Maastricht Radiation Oncology

Efterforskere

  • Ledende efterforsker: Dirk De Ruysscher, MD, PhD, Maastro Clinic, The Netherlands

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart

1. september 2016

Primær færdiggørelse (Forventet)

1. september 2017

Studieafslutning (Forventet)

1. december 2017

Datoer for studieregistrering

Først indsendt

19. juli 2016

Først indsendt, der opfyldte QC-kriterier

21. juli 2016

Først opslået (Skøn)

26. juli 2016

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

14. april 2017

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

13. april 2017

Sidst verificeret

1. august 2016

Mere information

Begreber relateret til denne undersøgelse

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • DE-CT

Plan for individuelle deltagerdata (IPD)

Planlægger du at dele individuelle deltagerdata (IPD)?

INGEN

Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .

Kliniske forsøg med Ikke småcellet lungekræft

Kliniske forsøg med DE-CT's and SE-CT

Søg i lignende forsøg

Sponsorer og samarbejdspartnere

Medicinske tilstande

Narkotikainterventioner

CROs by country

CROs in Iran

Betingelser

Sjældne sygdomme

Narkotikainterventioner

Kosttilskud

Sponsor / samarbejdspartnere

Placeringer

Abonner