About Dr Ooi Wei Seong

Dr Ooi Wei Seong is a medical oncologist and medical director at the International Cancer Specialists, Paragon Medical. He graduated from Trinity College Dublin with honours distinction in 1999.

After getting oncology training at St Vincent’s University Hospital in Dublin, he became a clinical fellow in oncology at Sunnybrook Odette Cancer Centre in Toronto, Canada. Upon returning to Singapore, he obtained his specialist accreditation in medical oncology.

Before his current practice, Dr Ooi was with the National Cancer Centre Singapore (NCCS) and Raffles Hospital. Currently, he is also a Visiting Specialist at the NCCS. His main interest lies in lung, breast, and colon cancers.

He frequents conferences around the world to continuously update his knowledge in the latest cancer treatments. In addition to management of all solid tumors, Dr Ooi has a special interest in bone health and mechanisms of bone metastases in cancer patients.

Outside of his clinical practice, Dr Ooi is an active speaker, tutor, and researcher. He has given talks about cancer management to overseas oncologists and general practitioners around the region. In Singapore, he has spoken at GP symposiums, public forums and also conducted Cancerwise workshops.

Dr Ooi commonly advises his patients to maintain an active lifestyle to help build up their immune system. He also debunks certain myths associated with cancer in the linked article written in partnership with the Singapore Cancer Society.

Beyond sharing his experience, he also provides training and teachings to medical students, nurses, Duke-NUS students, and elective fellows. In addition to this, he was a Clinical Tutor at Yong Loo Lin School of Medicine at the National University of Singapore.

Dr Ooi is involved as a co-investigator for many cancer trials. He also participated in the pharmaceutical-led clinical trials. On top of that, he has also contributed to publications in peer-reviewed journals.

Dr Ooi is a winner of the Human10 Trusted Reviews Award 2020. Click here to read his story.


Contact Dr Ooi Wei Seong

Phone: 6235 9005

Education

  • MB BCh BAO (U of Dublin
  • Ireland)
  • MRCP (UK) (RCP
  • United Kingdom)
  • FAMS (Medical Oncology)

Awards and Achievements

  • Singapore Health Quality Service Award (2011)

Recent Answers

What does enlarged lymph nodes indicate?

Lymph nodes are part of the lymphatic system which is also our 'defense' system. They serve to trap germs that may be circulating in our body. They drain lymphatic fluid from organs near where the nodes are located. For example, any disease in the head and neck areas may cause enlargement of nodes in the neck. They also may trap cancer cells if present in any particular part of the body. Both infectious and cancerous processes can cause enlargement of the node, which may be rapid or gradual. The enlarged nodes may or may not cause pain. It does not automatically mean that cancer is present.

Photo of Dr Ooi Wei Seong

Answered By

Dr Ooi Wei Seong

Oncologist

Which tumor markers are considered to be reliable indicators for cancer?

Tumor markers are in short, not reliable indicators for cancer. They are proteins produced by cancer cells and normal cells. Therefore they are always measurable in someone's blood tests and will never have a zero value. They are, however, included in most health screening packages, and therefore helpful when interpreted in conjunction with other parameters, as well as the patient's signs and symptoms. This will help guide subsequent investigations towards a particular organ system should the related tumor marker appear elevated.

Photo of Dr Ooi Wei Seong

Answered By

Dr Ooi Wei Seong

Oncologist

How do surgeons determine if a cyst is benign or malignant and requires removal?

Most cysts are actually benign. Malignant cysts refer to cysts that harbour cancer or those with a potential to develop into cancer. In determining whether or not they are malignant, the cysts are monitored for changes in size and consistency with regular ultrasounds. In some cases, you might also need to get an MRI. The surgeon would choose the necessary treatment based on symptoms such as: Pain Enlargement of the cyst size Presence of solid tissue within the cyst Treatment does not necesarry mean removal.

Photo of Dr Ooi Wei Seong

Answered By

Dr Ooi Wei Seong

Oncologist

Recent Sessions

Late Stage Breast Cancer: How to Treat It?

Ended on November 26, 2020

Dr Ooi Wei Seong is a medical oncologist and medical director at the International Cancer Specialists, Paragon Medical. Before his current practice, Dr Ooi was with the National Cancer Centre Singapore (NCCS) and Raffles Hospital. Currently, he is also a Visiting Specialist at the NCCS. His main interest lies in lung, breast, and colon cancers.

He frequents conferences around the world to continuously update his knowledge in the latest cancer treatments.

Losing a Part of You: Breast Cancer Survivors and How they Combated Breast Cancer

Ended on November 6, 2020

Dr Ooi Wei Seong is a medical oncologist and medical director at the International Cancer Specialists, Paragon Medical. He graduated from Trinity College Dublin with honours distinction in 1999.

After getting oncology training at St Vincent’s University Hospital in Dublin, he became a clinical fellow in oncology at Sunnybrook Odette Cancer Centre in Toronto, Canada. Upon returning to Singapore, he obtained his specialist accreditation in medical oncology.

Before his current practice, Dr Ooi was with the National Cancer Centre Singapore (NCCS) and Raffles Hospital. Currently, he is also a Visiting Specialist at the NCCS. His main interest lies in lung, breast, and colon cancers.

Living with Cancer: When Someone you Love has Cancer

Ended on August 19, 2020

About Dr Ooi Wei Seong
Dr Ooi Wei Seong is a medical oncologist and medical director at the International Cancer Specialists, Paragon Medical. He graduated from Trinity College Dublin with honours distinction in 1999. His main interest lies in lung, breast, and colon cancers. He frequents conferences around the world to continuously update his knowledge in the latest cancer treatments. In addition to the management of all solid tumors, Dr Ooi has a special interest in bone health and mechanisms of bone metastases in cancer patients.

Publications

Practice

290 Orchard Road Paragon Tower 1 Lobby F #15-01/02 Singapore 238859

Book Appointment

Background Check

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No Singapore Medical Council Disciplinary Tribunal actions found for the years we collect data.

* This profile has been last updated on November 9, 2020.