Denne side blev automatisk oversat, og nøjagtigheden af ​​oversættelsen er ikke garanteret. Der henvises til engelsk version for en kildetekst.

Body Composition and Setup Errors in Radiotherapy (BODY-SET)

23. juni 2026 opdateret af: Chaoxing Liu, Shijiazhuang People's Hospital

The Impact of Body Composition on Setup Errors in Patients Undergoing Radiotherapy With Thermoplastic Mask Immobilization: A Single-Center Prospective Cohort Study

This single-center prospective cohort study investigates the association between body composition parameters and setup errors in 120-150 patients receiving radiotherapy with thermoplastic mask immobilization. Body composition (skeletal muscle mass, body fat percentage, phase angle, fat-free mass) will be measured using bioelectrical impedance analysis at baseline and at fraction 20. Setup errors (six degrees of freedom) will be recorded via daily cone-beam computed tomography. The primary outcome is the association between baseline body composition and setup errors. Secondary outcomes include the relationship between body composition changes during radiotherapy and setup error evolution, and identification of threshold values for clinically significant setup error increases. This study will provide evidence on whether body composition-beyond BMI-predicts radiotherapy setup accuracy, potentially enabling personalized immobilization and image-guided strategies.

Studieoversigt

Status

Ikke rekrutterer endnu

Betingelser

Detaljeret beskrivelse

Radiotherapy is a cornerstone of cancer treatment, with approximately 50-70% of patients requiring radiotherapy during their disease course. Accurate patient positioning is essential for ensuring adequate target volume coverage while sparing organs at risk. Thermoplastic masks are among the most commonly used immobilization devices; however, setup reproducibility varies considerably among patients. Previous studies have demonstrated that patients with BMI ≥24 kg/m² exhibit significantly greater setup errors across multiple directions in breast, cervical, and thoracic cancers compared with normal-weight patients. However, BMI is a crude anthropometric measure that cannot distinguish between fat and muscle mass-two tissue types with fundamentally different mechanical properties that may affect mask fit and positional reproducibility. Bioelectrical impedance analysis (BIA) provides a non-invasive, convenient method for measuring body composition parameters, including skeletal muscle mass (SMM), body fat percentage (BFP), phase angle (PhA), and fat-free mass (FFM). Phase angle, in particular, reflects cell membrane integrity and cellular mass, and has been validated as a sensitive marker of muscle quality and nutritional status in cancer patients. However, the value of BIA-derived body composition parameters in predicting radiotherapy setup errors has not been systematically explored. This study is a single-center, prospective observational cohort study conducted at the Department of Radiation Oncology, Shijiazhuang People's Hospital, China. A total of 120-150 patients with pathologically confirmed malignancies receiving radical or adjuvant intensity-modulated radiotherapy (≥25 fractions) with thermoplastic mask immobilization will be enrolled. Body composition parameters will be measured using BIA at baseline (T0) and at fraction 20 (T1). Setup errors (six degrees of freedom: Tx, Ty, Tz, Rx, Ry, Rz) will be recorded via cone-beam computed tomography (week 1: 3 times; thereafter: weekly). The primary outcome is the association between baseline body composition parameters and setup errors. Secondary outcomes include the relationship between body composition changes and setup error evolution, and identification of threshold values for clinically significant setup error increases. Data will be analyzed using multiple linear regression and generalized estimating equations. Results will be disseminated through peer-reviewed publications and conference presentations.

Undersøgelsestype

Observationel

Tilmelding (Anslået)

150

Kontakter og lokationer

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

Studiekontakt

Undersøgelse Kontakt Backup

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

  • Voksen
  • Ældre voksen

Tager imod sunde frivillige

Ingen

Prøveudtagningsmetode

Sandsynlighedsprøve

Studiebefolkning

Patients with pathologically confirmed malignancies receiving radical or adjuvant intensity-modulated radiotherapy at Shijiazhuang People's Hospital.

Beskrivelse

Inclusion Criteria:

  • Pathologically confirmed malignancy
  • Age ≥18 years
  • Receiving radical or adjuvant intensity-modulated radiotherapy (IMRT) with planned ≥25 fractions
  • Immobilized with thermoplastic mask
  • ECOG Performance Status 0-2
  • Willing and able to provide written informed consent

Exclusion Criteria:

  • Metal implants (pacemaker, artificial joints) affecting bioelectrical impedance analysis (BIA) measurements
  • Severe edema or ascites
  • Inability to cooperate with immobilization or CBCT scanning
  • Radiotherapy interruption >5 fractions
  • Pregnancy or lactation

Studieplan

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

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

Kohorter og interventioner

Gruppe / kohorte
High Muscle Mass Group
Patients with skeletal muscle mass above the sex-specific median
Low Muscle Mass Group
Patients with skeletal muscle mass below the sex-specific median

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
setup errors
Tidsramme: Through study completion, an average of 6 months.
Six-degree-of-freedom setup errors (Tx, Ty, Tz, Rx, Ry, Rz) measured by cone-beam computed tomography (CBCT).
Through study completion, an average of 6 months.

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Change in Skeletal Muscle Mass
Tidsramme: Baseline and fraction 20 (approximately 4 weeks after baseline)
Change in skeletal muscle mass (SMM) from baseline (T0) to radiotherapy fraction 20 (T1), measured by multi-frequency bioelectrical impedance analysis (BIA). SMM is expressed in kilograms (kg).
Baseline and fraction 20 (approximately 4 weeks after baseline)
Change in Body Fat Percentage
Tidsramme: Baseline and fraction 20 (approximately 4 weeks after baseline).
Change in body fat percentage (BFP) from baseline (T0) to radiotherapy fraction 20 (T1), measured by multi-frequency bioelectrical impedance analysis (BIA). BFP is expressed as a percentage (%).
Baseline and fraction 20 (approximately 4 weeks after baseline).
Change in Phase Angle
Tidsramme: Baseline and fraction 20 (approximately 4 weeks after baseline)
Change in phase angle (PhA) from baseline (T0) to radiotherapy fraction 20 (T1), measured by multi-frequency bioelectrical impedance analysis (BIA). PhA is expressed in degrees (°).
Baseline and fraction 20 (approximately 4 weeks after baseline)
Change in Fat-Free Mass
Tidsramme: Baseline and fraction 20 (approximately 4 weeks after baseline)
Change in fat-free mass (FFM) from baseline (T0) to radiotherapy fraction 20 (T1), measured by multi-frequency bioelectrical impedance analysis (BIA). FFM is expressed in kilograms (kg).
Baseline and fraction 20 (approximately 4 weeks after baseline)

Samarbejdspartnere og efterforskere

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

Sponsor

Efterforskere

  • Ledende efterforsker: Chaoxing Liu, Dr, Shijiazhuang People's Hospital

Publikationer og nyttige links

Den person, der er ansvarlig for at indtaste oplysninger om undersøgelsen, leverer frivilligt disse publikationer. Disse kan handle om alt relateret til undersøgelsen.

Generelle publikationer

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 (Anslået)

1. juli 2026

Primær færdiggørelse (Anslået)

31. december 2026

Studieafslutning (Anslået)

31. marts 2027

Datoer for studieregistrering

Først indsendt

18. juni 2026

Først indsendt, der opfyldte QC-kriterier

23. juni 2026

Først opslået (Faktiske)

30. juni 2026

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

30. juni 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

23. juni 2026

Sidst verificeret

1. juni 2026

Mere information

Begreber relateret til denne undersøgelse

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • SJZPH-RO-2026-001

Plan for individuelle deltagerdata (IPD)

Planlægger du at dele individuelle deltagerdata (IPD)?

INGEN

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

Studerer et amerikansk FDA-reguleret lægemiddelprodukt

Ingen

Studerer et amerikansk FDA-reguleret enhedsprodukt

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 .