Owen Allen Ung

Prof. Owen Allen Ung

orcid

Research Focus & Metrics

Academic Career Length

32Years (1995-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 February 2006 in Physical Therapy
Verified
Journal Article
Open access
PDF file
RTRichard Taylor
Richard Taylor
UJUpali W Jayasinghe
Upali W Jayasinghe
LKLouise Koelmeyer
Louise Koelmeyer
OUOwen Allen Ung
Owen Allen Ung
JBJohn Boyages
John Boyages
Background and Purpose. Arm lymphedema following breast cancer surgery is a continuing problem. In this study, we assessed the reliability and validity of circumferential measurements and water displacement for measuring upper-limb volume. Subjects. Participants included subjects who had had breast cancer surgery, including axillary dissection—19 with and 22 without a diagnosis of arm lymphedema—and 25 control subjects. Methods. Two raters measured each subject by using circumferential tape measurements at specified distances from the fingertips and in relation to anatomic landmarks and by using water displacement. Interrater reliability was calculated by analysis of variance and multilevel modeling. Volumes from circumferential measurements were compared with those from water displacement by use of means and correlation coefficients, respectively. The standard error of measurement, minimum detectable change (MDC), and limits of agreement (LOA) for volumes also were calculated. Results. Arm volumes obtained with these methods had high reliability. Compared with volumes from water displacement, volumes from circumferential measurements had high validity, although these volumes were slightly larger. Expected differences between subjects with and without clinical lymphedema following breast cancer were found. The MDC of volumes or the error associated with a single measure for data based on anatomic landmarks was lower than that based on distance from fingertips. The mean LOA with water displacement were lower for data based on anatomic landmarks than for data based on distance from fingertips. Discussion and Conclusion. Volumes calculated from anatomic landmarks are reliable, valid, and more accurate than those obtained from circumferential measurements based on distance from fingertips. [Taylor R, Jayasinghe UW, Koelmeyer L, et al. Reliability and validity of arm volume measurements for assessment of lymphedema. Phys Ther. 2006;86:205–214.]

1 August 2016 in The Breast
Verified
Journal Article
Closed access
SKSharon Kilbreath
Sharon Kilbreath
KRK.M. Refshauge
K.M. Refshauge
JBJane Beith
Jane Beith
LWL.C. Ward
L.C. Ward
OUOwen Allen Ung
Owen Allen Ung
KGK. Gaitatzis
K. Gaitatzis

22 March 2004 in Cancer
Verified
Journal Article
Open access
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CLCarson Leong
Carson Leong
JBJohn Boyages
John Boyages
UJUpali W. Jayasinghe
Upali W. Jayasinghe
MBMichael Bilous
Michael Bilous
OUOwen Allen Ung
Owen Allen Ung
AWAngela Y. Wong
Angela Y. Wong
BACKGROUND: Breast conservative surgery (CS) with radiotherapy (RT) is the most commonly used treatment for early‐stage breast carcinoma. However, there is controversy regarding the importance of the pathologic margin status on the risk of ipsilateral breast tumor recurrence (IBTR). The current study evaluated the effect of the pathologic margin status on IBTR rates in a cohort of women with lymph node‐negative breast carcinoma treated with CS and RT.METHODS: Between August 1980 and December 1994, 452 women with pathologically lymph node‐negative breast carcinoma were treated with CS and RT at Westmead Hospital (Westmead, Australia). Central pathology review was performed for all women. The final margins were negative for 352 women (77.9%), positive (invasive and/or in situ) for 42 women (9.3%), and indeterminate for 58 women (12.8%). Information regarding an extensive intraductal component (EIC), lymphovascular invasion, pathologic tumor size, histologic grade, and nuclear grade was available for most women. After macroscopic total excision of the tumor, all women received whole‐breast irradiation (usually 45–50.4 grays [Gy]) and the majority of women also received a local tumor bed boost (range, 8–30 Gy).RESULTS: After a median follow‐up of 80 months, 34 women (7.5%) developed an IBTR. The crude 5‐year rates of IBTR for women with negative margins, positive margins, and indeterminate margins were 3.1%, 11.9%, and 6.9%, respectively. For women with negative margins, the 5‐year and 10‐year actuarial rates of freedom from IBTR were 96% and 92%, respectively, compared with 88% and 75%, respectively, for women with positive margins (P = 0.003). Univariate analysis demonstrated that the only factors associated with a significantly higher risk of IBTR were age at diagnosis (P < 0.050) and margin status (P = 0.005). Multivariate analysis showed that both age and margin status were independent predictors of IBTR. None of 24 patients with an EIC and negative margins were found to have developed an IBTR.CONCLUSIONS: The results of the current study were comparable to other published reports and supported the association of higher IBTR rates with positive or indeterminate margins compared with negative, pathologic margins. Furthermore, young age (age < 35 years at diagnosis) was associated with the highest risk of IBTR regardless of margin status. Cancer 2004. © 2004 American Cancer Society.

20 December 2001 in Anz Journal of Surgery
Verified
Journal Article
Closed access
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BCBoon Chua
Boon Chua
OUOwen Allen Ung
Owen Allen Ung
RTRichard Taylor
Richard Taylor
JBJohn Boyages
John Boyages

1 June 2017 in Tissue Engineering Part B: Reviews
Verified
Journal Article
Closed access
LVLuke E. Visscher
Luke E. Visscher
MCMatthew Cheng
Matthew Cheng
MCMohit Chhaya
Mohit Chhaya
MHMadeline L. Hintz
Madeline L. Hintz
JSJan-Thorsten Schantz
Jan-Thorsten Schantz
Dietmar Werner HutmacherDietmar Werner Hutmacher
Dietmar Werner Hutmacher
Breast reconstruction and augmentation are very common procedures, yet the prevailing current methods utilize silicone implants that may have significant local complications requiring reoperation. Lipofillling is increasingly used to contour and is considered safe, however, its utility is limited by significant volume loss. A new approach could offer an alternative and increase the scope of patient choice. A small number of teams around the world are investigating a breast tissue engineering (TE) paradigm. Conventional breast TE concepts are based on seeding a scaffold with the patients' own stem cells. However, the clinical viability of many of these approaches is limited by their costs in relevant volumes. In this article the state of the art of tissue-engineered breast reconstruction is reviewed and future perspectives are presented and discussed.

4 January 2019 in World Journal of Surgery
Verified
Journal Article
Closed access
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YCYIP CHENG-HAR
YIP CHENG-HAR
DED. G. Evans
D. G. Evans
GAG. Agarwal
G. Agarwal
IBI. Buccimazza
I. Buccimazza
AKA. Kwong
A. Kwong
SMS. Meterissian
S. Meterissian