Evidence map›Paper›PMID 27278960›Full record

ArticleRadiation oncology (London, England)2016

A Nomogram to predict parotid gland overdose in head and neck IMRT.

J Castelli, A Simon, B Rigaud, C Lafond, E Chajon, J D Ospina, P Haigron, B Laguerre, A Ruffier Loubière, K Benezery and 1 more

Open access · goldAbstract read
In one paragraph

Article in Radiation oncology (London, England), 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 13 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
13citing papers in PubMed, 1 pooled it
4.9field-weighted citation impact, top 5% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

13 citing papers in PubMed, 1 synthesis or guideline pooled it, 33 citations in OpenAlex.

  1. Pooled it
  2. A density assignment method for dose monitoring in head-and-neck radiotherapy.Strahlentherapie und Onkologie : Organ der Deutschen Rontgengesellschaft ... [et al] · 2019
    Trial
  3. Article
  4. Article
  5. Article
  6. Review
  7. Article
  8. Review
  9. Article
  10. Article
  11. Adaptive radiotherapy for head and neck cancer.Cancers of the head & neck · 2020
    Review
  12. Article
  13. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

11 authors at 5 institutions in 1 country.

J CastelliCentre Eugene Marquis, Radiotherapy, de la Bataille Flandre Dunkerque, F-35000, Rennes, France. j.castelli@rennes.unicancer.fr.
A SimonRennes University 1, LTSI, Campus de Beaulieu, Rennes, F-35000, France.
B RigaudRennes University 1, LTSI, Campus de Beaulieu, Rennes, F-35000, France.
C LafondCentre Eugene Marquis, Radiotherapy, de la Bataille Flandre Dunkerque, F-35000, Rennes, France.
E ChajonCentre Eugene Marquis, Radiotherapy, de la Bataille Flandre Dunkerque, F-35000, Rennes, France.
J D OspinaRennes University 1, LTSI, Campus de Beaulieu, Rennes, F-35000, France.
P HaigronRennes University 1, LTSI, Campus de Beaulieu, Rennes, F-35000, France.
B LaguerreCentre Eugene Marquis, Medical oncology, Rennes, F-35000, France.
A Ruffier LoubièreCHRU de Tours, Radiotherapy, Tours, F-37550, France.
K BenezeryCentre Antoine Lacassagne, Radiotherapy, Nice, F-06100, France.
R de CrevoisierCentre Eugene Marquis, Radiotherapy, de la Bataille Flandre Dunkerque, F-35000, Rennes, France.
Centre Eugène Marquis · FRUniversité de Rennes · FRInserm · FRCentre Antoine Lacassagne · FRCentre Hospitalier Universitaire de Tours · FR

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposesTo generate a nomogram to predict parotid gland (PG) overdose and to quantify the dosimetric benefit of weekly replanning based on its findings, in the context of intensity-modulated radiotherapy (IMRT) for locally-advanced head and neck carcinoma (LAHNC). MATERIAL AND

methodsTwenty LAHNC patients treated with radical IMRT underwent weekly computed tomography (CT) scans during IMRT. The cumulated PG dose was estimated by elastic registration. Early predictors of PG overdose (cumulated minus planned doses) were identified, enabling a nomogram to be generated from a linear regression model. Its performance was evaluated using a leave-one-out method. The benefit of weekly replanning was then estimated for the nomogram-identified PG overdose patients.

resultsClinical target volume 70 (CTV70) and the mean PG dose calculated from the planning and first weekly CTs were early predictors of PG overdose, enabling a nomogram to be generated. A mean PG overdose of 2.5Gy was calculated for 16 patients, 14 identified by the nomogram. All patients with PG overdoses >1.5Gy were identified. Compared to the cumulated delivered dose, weekly replanning of these 14 targeted patients enabled a 3.3Gy decrease in the mean PG dose.

conclusionBased on the planning and first week CTs, our nomogram allowed the identification of all patients with PG overdoses >2.5Gy to be identified, who then benefitted from a final 4Gy decrease in mean PG overdose by means of weekly replanning.

Indexed as

NomogramsAgedFemaleFollow-Up StudiesHead and Neck NeoplasmsHumansMaleMiddle AgedOrgans at RiskParotid GlandPrognosisRadiotherapy DosageRadiotherapy, Intensity-ModulatedRadiotherapy Planning, Computer-AssistedAdaptive radiotherapyHead and neckNomogramParotid gland overdose

Identifiers

PMID27278960
PMCPMC4898383
OpenAlexW2413404410

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.