Dr. Mark Augustine S. Onglao or Mac is a consultant at the University of the Philippines – Manila, Philippine General Hospital, serving as training officer of the Division of Colorectal Surgery.
Dr. Onglao obtained his medical degree at the University of the Philippines College of Medicine, graduating as salutatorian in 2011. He garnered first place during the Physicians’ Licensure Examination in August 2011. He finished his training in General Surgery in 2016 and Colorectal Surgery Fellowship in 2018 at the Philippine General Hospital. After fellowship, he pursued advanced training in minimally invasive Colorectal and Robotic Surgery in Tan Tock Seng Hospital, Singapore and National Cancer Center, Japan. He is currently a Fellow of the Philippine Society of Colon and Rectal Surgeons and the Philippine College of Surgeons.
His main interests focus on the multidisciplinary treatment of colorectal cancer, minimally invasive and robotic surgery and Enhanced Recovery After Surgery.
Selected publications from PubMed
Cost Analysis of Enhanced Recovery After Surgery (ERAS) in Elective Colorectal Surgery in a Philippine Government Hospital.
Zamora MAA, Lopez MPJ, Onglao MAS, Monroy HJ 3rd
Acta Med Philipp. 2025;59(15):32-38 doi: 10.47895/amp.vi0.11695.
Outcomes of Robotic versus Laparoscopic versus Open Resection for Rectal Cancer in a Center with a Beginning Robotic Colorectal Surgery Program.
Lopez MPJ, Viray BAG, Onglao MAS, Tampo MMT, Monroy HJ 3rd
Acta Med Philipp. 2024;58(19):74-82 doi: 10.47895/amp.vi0.7081.
Indocyanine Green (ICG) Fluorescence in the Assessment of Vascularity of Anastomotic Margins in Colorectal Surgery in a Lower Middle-Income Country (LMIC) Hospital.
Lim MGL, Lopez MPJ, Onglao MAS, Monroy HJ 3rd, Sacdalan MDP
Acta Med Philipp. 2024;58(16):8-13 doi: 10.47895/amp.v58i16.7057.
Modified Duhamel Procedure for Adult Hirschsprung Disease.
Villanueva MEP, Onglao MAS, Lopez MPJ
Dis Colon Rectum. 2022 Sep 1;65(9):e908 doi: 10.1097/DCR.0000000000002366.
McKittrick-Wheelock Syndrome: A Case Series.
Villanueva MEP, Onglao MAS, Tampo MMT, Lopez MPJ
Ann Coloproctol. 2022 Jun;38(3):266-270 doi: 10.3393/ac.2020.00745.0106.
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