title: Collagen fragment biomarkers as serological biomarkers of lean body mass - a biomarker pilot study from the DAHANCA25B cohort and matched controls.
abstract: BACKGROUND
  Loss of muscle mass and function is an important complication to ageing and a range of pathologies, including, but not restricted to, cancer, organ failures, and sepsis. A number of interventions have been proposed ranging from exercise to anabolic pharmacological therapy, with varying success. Easily applicable serological biomarkers of lean and/or muscle mass and change therein would benefit monitoring of muscle mass during muscle atrophy as well as during recovery. We set out to validate if novel peptide biomarkers derived from Collagen III and VI were markers of lean body mass (LBM) or change therein in head and neck cancer patients in the Danish Head and Neck Cancer Group(DAHANCA) 25B cohort subjected to resistance training as well as in an age-matched and gender-matched control group.
  
  
  METHODS
  Blood samples and dual X-ray absorptiometry data were measured at baseline, after 12 and 24 weeks in 41 HNSCC subjects of the DAHANCA 25B cohort of subjects recovering from neck and head cancer (stages provided in Table 1), and at baseline only in 21 healthy age-matched and gender-matched controls. Serum from blood was analyzed for the ProC3, IC6, and C6M peptide biomarkers and LBM were derived from the dual X-ray absorptiometry scans.
  
  
  RESULTS
  We were not able to show any correlation between biomarkers and LBM or C6M and anabolic response to exercise in recovering head and neck cancer patients. However, we did find that the biomarkers IC6, IC6/C6M, and ProC3 are biomarkers of LBM in the control group subjects (R (2)/P of 0.249/0.035, 0.416/0.007 and 0.178 and P = 0.057, respectively).
  
  
  CONCLUSIONS
  In conclusion, the IC6, ProC3, and IC6/C6M biomarkers are indeed biomarkers of LBM in healthy individuals of both genders, but not in HNSCC patients.
authors.affiliation: Nordic Bioscience Biomarkers and Research Herlev, Denmark ; Institute of Sports Medicine Copenhagen (ISMC), Bispebjerg Hospital Copenhagen, Denmark.
authors.forename: Anders
authors.initials: A
authors.lastname: Nedergaard
authors.affiliation: Dept. of Public Health, Section for Sports Science, Aarhus University Aarhus, Denmark.
authors.forename: Ulrik
authors.initials: U
authors.lastname: Dalgas
authors.affiliation: Dept. of Oncology, Aarhus University Hospital Aarhus, Denmark.
authors.forename: Hanne
authors.initials: H
authors.lastname: Primdahl
authors.affiliation: Dept. of Oncology, Odense University Hospital Odense, Denmark.
authors.forename: Jørgen
authors.initials: J
authors.lastname: Johansen
authors.affiliation: Dept. of Experimental Clinical Oncology, Aarhus University Hospital Aarhus, Denmark.
authors.forename: Jens
authors.initials: J
authors.lastname: Overgaard
authors.affiliation: Dept. of Public Health, Section for Sports Science, Aarhus University Aarhus, Denmark.
authors.forename: Kristian
authors.initials: K
authors.lastname: Overgaard
authors.affiliation: Nordic Bioscience Biomarkers and Research Herlev, Denmark.
authors.forename: Kim
authors.initials: K
authors.lastname: Henriksen
authors.affiliation: Nordic Bioscience Biomarkers and Research Herlev, Denmark.
authors.forename: Morten Asser
authors.initials: MA
authors.lastname: Karsdal
authors.affiliation: Dept. of Public Health, Section for Sports Science, Aarhus University Aarhus, Denmark ; Dept. of Experimental Clinical Oncology, Aarhus University Hospital Aarhus, Denmark.
authors.forename: Simon
authors.initials: S
authors.lastname: Lønbro
keywords: Biomarker; Head and neck cancer; Muscle; Resistance training