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Derek Tsang

@dtsang.ca
359 followers 181 following 58 posts

Radiation Oncologist #RadOnc Princess Margaret Cancer Centre 🇨🇦 | Associate Professor UofT | he/him

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Derek Tsang @dtsang.ca · 28/05/2026
Pleased to report our paper on stereotactic radiation (SBRT) for children with recurrent/metastatic cancer has been reported - led by Dr Hassan. SBRT can delay need to add/change/modify systemic therapy for many months! www.sciencedirect.com/science/arti... #radonc
sciencedirect.com
Stereotactic ablative radiotherapy extends time to subsequent systemic therapy in pediatric cancer patients with recurrent or metastatic disease
Stereotactic ablative radiotherapy (SAbR) has been used in the adult population for decades, providing local control (LC) and, in some cases, overall …
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Derek Tsang @dtsang.ca · 07/05/2026
www.theglobeandmail.com/business/com...
theglobeandmail.com
Opinion: AI products are defective and dangerous. Why are we using them at all?
In our pursuit of productivity we have waived the most basic requirements of safety and accountability
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Reposted by Derek Tsang
Altmetric @altmetric.com · 09/04/2026
This paragraph is particularly devastating. That’s an ultra-weighted algo in the midst of skewing the reach of certain accounts into absolute obscurity.
The Numbers Aren't Working
Out
We posted to Twitter (now known as X) five to ten times a day in 2018. Those tweets garnered somewhere between 50 and 100 million impressions per month. By 2024, our 2,500 X posts generated around 2 million impressions each month. Last year, our 1,500 posts earned roughly 13 million impressions for the entire year.
To put it bluntly, an X post today receives less than 3% of the views a single tweet delivered seven years ago.
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Reposted by Derek Tsang
OncoDaily @oncodaily.bsky.social · 25/02/2026
AI as a Source of Misinformation for Patients - Derek Tsang @dtsang.ca oncodaily.com/voices/derek... #OncoDaily #Oncology #Cancer #Health #Medicine #MedEd #MedOnc #MedNews
oncodaily.com
Derek Tsang: AI as a Source of Misinformation for Patients - OncoDaily
Derek Tsang: AI as a Source of Misinformation for Patients / cancer, Derek Tsang, Ningjun Shao, OncoDaily, Oncology
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Reposted by Derek Tsang
august 🍂 @auguststreet.ca · 03/02/2026
line 5 just confirmed to open this sunday, february 8! with only 5 days notice, this got to be a record from the TTC on shortest notice *ever* for a new transit line opening. we've only waited 15 years :)
(TTC slide deck)

Phased opening

Recognizing the scale of the project and the need for a safe, predictable customer experience, Line 5 will open using a phased approach

This staged rollout alllows both organizations to monitor early performance, validate the line under real-world operating conditions, and make targeted adjustments

the phased opening will commence on sunday, february 8

service on february 8 will be free for TTC customers

each phase introduces additional service elements such as extended operating hours and incremental system enhancements
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Derek Tsang @dtsang.ca · 23/01/2026
Dr @herbloongmd.bsky.social giving the keynote address at I-OSICON in Chennai 🇮🇳 on lung cancer immunotherapy 🫁 🇭🇰
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Derek Tsang @dtsang.ca · 22/01/2026
Great to hear Dr @herbloongmd.bsky.social speak about immunotherapy clinical trials at Apollo Proton Cancer Centre in Chennai, India.
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Derek Tsang @dtsang.ca · 12/12/2025
Thank you to the @torontosymphony.bsky.social for visiting Princess Margaret Cancer Centre and playing music 🎶 for our @radmedpm.bsky.social and solid tumour cancer patients! What an uplifting event — Happy holidays ❄️ (picture taken with permission)
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Reposted by Derek Tsang
AZ Faust @azfaust.bsky.social · 25/11/2025
The biggest clue to cranks that there is no vaccine conspiracy is that Doctors and Scientists continue to vaccinate their own children at record rates.
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Derek Tsang @dtsang.ca · 26/09/2025
www.cbc.ca/news/investi...
cbc.ca
Ontario's multimillion-dollar deal with American health clinics | CBC News
An exclusive CBC data analysis has found that since 2018, Ontario has spent over $200 million sending patients to U.S. clinics for procedures unavailable in Canada. The biggest expenditure under the p...
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Derek Tsang @dtsang.ca · 22/09/2025
Traffic shouldn’t come at the cost of pedestrian lives. apple.news/AABDIMXHmQoy... #onpoli #topoli
apple.news
Opinion: Children’s safety matters more than shaving a few seconds off someone’s commute — The Globe and Mail
Doug Ford complains that speed cameras target people going just 10 km/h over the limit, but that’s enough to make the difference between life and death
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Reposted by Derek Tsang
ProPublica @propublica.org · 20/09/2025
Much of the cardboard and paper goods strewn about our homes are sold by a single private company, with its name, Uline, stamped on the bottom. Many may not know that a multibillion-dollar fortune made on those ubiquitous products fuels far-right candidates across the country. (Published 2022)
propublica.org
That Cardboard Box in Your Home Is Fueling Election Denial
A previously unreported boom in profits for the shipping supply giant Uline has provided the funds for a deeply conservative Midwestern family to bankroll anti-democracy causes around the country.
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Derek Tsang @dtsang.ca · 29/07/2025
Welcome to #bsky! #radonc
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Derek Tsang @dtsang.ca · 09/07/2025
Republicans should stop denying climate change as a start apple.news/AY9veXOYoSdy...
apple.news
Wisconsin and Minnesota Republicans call on Canada to curb wildfire smoke — The Canadian Press
Six Republican lawmakers have sent a letter to Canada's ambassador calling fo
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Derek Tsang @dtsang.ca · 01/07/2025
Congratulations 🎉
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Derek Tsang @dtsang.ca · 01/07/2025
🇨🇦🇨🇦
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Derek Tsang @dtsang.ca · 29/06/2025
There is a sidewalk which is a raised pathway that isn’t visible in the picture
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Derek Tsang @dtsang.ca · 29/06/2025
This is why #bike lanes matter 🚲 @cycletoronto.bsky.social #topoli
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Reposted by Derek Tsang
André Picard @picardonhealth @picardonhealth.bsky.social · 22/06/2025
Remember when summer used to be carefree and fun, not filled with apocalyptic challenges from wildfires to suffocating heat? Tackling #ClimateChange requires mitigation and adaptation, not just eco-anxiety, by @picardonhealth.bsky.social www.theglobeandmail.com/opinion/arti... @theglobeandmail.com
theglobeandmail.com
Opinion: Rescuing summer holidays from the clutches of climate change
A never-ending cascade of threats is a reminder that we need to mitigate the climate crisis if we don’t want to leave our kids in a hellscape
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Reposted by Derek Tsang
Dr Joss Reimer @jossreimer.bsky.social · 18/06/2025
AB is seeing its worst measles outbreak since 1979 – last week reaching 879 cases & rising. Measles is highly contagious but preventable. The vaccine is 97% effective. Protect yourself and your community.
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Derek Tsang @dtsang.ca · 13/06/2025
Was a pleasure to visit @cuanschutz.bsky.social and @childrensresearch.bsky.social this week and participate as faculty in the 8th Postgraduate Course on Childhood Craniopharyngioma in Denver, Colorado. Thank you Dr Hankinson for hosting and organizing a great meeting.
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Derek Tsang @dtsang.ca · 13/06/2025
Happy to share our work led by Dr Inhwa Kim (radiation oncology resident @radmedpm.bsky.social) on our #proton therapy consultation service for Canadian patients. We showed reduction in dose to healthy tissues with #protons. doi.org/10.1016/j.ti...
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Derek Tsang @dtsang.ca · 11/06/2025
#radonc
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Derek Tsang @dtsang.ca · 10/06/2025
Pleased to share our Critical Review on use of stereotactic radiation for children with cancer, and how we can apply adult-derived evidence to inform clinical practice. www.redjournal.org/article/S036...
redjournal.org
Stereotactic Radiation Therapy in Children and Young Adults: Can We Apply Adult Treatment Paradigms?
The use of stereotactic radiation therapy (RT) in the treatment of children and young adults with malignancies and benign conditions has been increasing. However, the evidence guiding stereotactic RT ...
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Reposted by Derek Tsang
TTCriders @ttcriders.bsky.social · 03/06/2025
We’re setting the record straight on dedicated lanes. Red lanes on Dufferin and Bathurst will make our travel faster, safer, and more accessible. They will also help cut congestion and reduce pollution. Read this thread to get the facts ⬇️ 1/5
Graphic of a bus stuck in traffic

Transit only lanes mean better commutes and a better Toronto.

Get the facts about transit-only lanes on Bathurst and Dufferin
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Reposted by Derek Tsang
Kirsten Bibbins-Domingo @kbibbinsdomingo.bsky.social · 02/06/2025
JAMA Oncology is now on @bsky.app !! Follow @jamaoncology.bsky.social & @jama.com for oncology content #MedSky #OncSky #ASCO25
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Reposted by Derek Tsang
Josh Trebach, MD @jtrebach.bsky.social · 02/06/2025
if you have a uti you should see a statistician bc they know a lot about pee values
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Derek Tsang @dtsang.ca · 02/06/2025
Dr David Mak (@radmedpm.bsky.social) presenting a secondary analysis of data from ACNS1123 stratum 1 at #asco25 - proton therapy associated with improved IQ as compared with x-ray (photon) radiation in children with non-germinomatous germ cell tumours.
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Derek Tsang @dtsang.ca · 01/06/2025
So much immunotherapy! Exciting to see new treatments available for patients
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American Society of Clinical Oncology @ascocancer.bsky.social · 01/06/2025
Second up! Dr. Jean Bourhis Sr presents NIVOPOSTOP (GORTEC 2018-01): chemoRT +/- nivolumab for resected, high risk head and neck squamous cell carcinoma. 24% risk reduction in disease progression or death: 3-year DFS 63.1 vs 52.5 months (HR 0.76) with substantial drop in locoregional relapse #ASCO25
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Derek Tsang @dtsang.ca · 01/06/2025
Agree! Need the Government of Ontario to step up and properly fund @tdsb.on.ca and other school boards, and not threaten to take their land or governance
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Josh Matlow @joshmatlow.bsky.social · 01/06/2025
This article is from 2008. Together, we fought hard to save Toronto’s school pools. Today, they’re threatened with closure once again. It’s time for life-saving aquatic programming, outdoor education and special needs programs to finally be supported by the province
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American Society of Clinical Oncology @ascocancer.bsky.social · 01/06/2025
First up at #ASCO25 Plenary: According to ATOMIC results, adding atezo to FOLFOX improves DFS in stage III dMMR #ColonCancer & yields 50% reduction in the risk of recurrence & death vs chemo alone: brnw.ch/21wT4N9 #ASCODailyNews
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Reposted by Derek Tsang
Citizens’ Climate Lobby Canada @citizenslobbyca.bsky.social · 01/06/2025
Fossil fuel companies have been blocking the transition away from their dangerous product since 1967. Wildfires causing an increased in asthma and spur new onset epilepsy. Plus post menopausal women can’t bear the heat. Enough is enough #SueBigOil news.westernu.ca/2025/05/air-...
news.westernu.ca
Air pollution may increase epilepsy risk, new study suggests
Western and LHSCRI researchers found a direct connection between new cases of epilepsy in adults in Ontario and long-term exposure to air pollution
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Derek Tsang @dtsang.ca · 30/05/2025
So proud of our @radmedpm.bsky.social trainees Dr Zhao and Dr Mak, winners of #asco25 awards!
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Derek Tsang @dtsang.ca · 30/05/2025
Made it to #asco2025! Excited for our @radmedpm.bsky.social resident Dr Mak to present #acns1123 data on cognition after proton vs photon data- and to see the latest brain tumour science.
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Derek Tsang @dtsang.ca · 30/05/2025
apple.news/AHuvE-t-2Tj2... Need to treat the climate emergency as the emergency that it is 😢 🚨
apple.news
Environment Canada issues air quality alerts due to wildfire smoke — CTV News
Wildfire smoke has caused Environment Canada to issue air quality alerts in Alberta, Saskatchewan, Manitoba, Northwest Territories, Ontario and Labrador.
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Derek Tsang @dtsang.ca · 29/05/2025
See you at ASCO!
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Derek Tsang @dtsang.ca · 29/05/2025
apple.news/AKmWSuL15R0y...
apple.news
Anti-anxiety pill travels 52,000 kilometres to get to Canadian shelves, study shows — The Globe and Mail
The anti-anxiety medication clonazepam is produced on multiple continents, making it vulnerable to shocks such as tariffs, researchers say
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Derek Tsang @dtsang.ca · 23/05/2025
Grateful to the organizers of #CNO2025 (Canadian Neuro-Oncology Meeting in Vancouver) for the opportunity to speak about our work in using AI and machine learning to improve radiation for children and adults with brain tumours (#btsm)
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Reposted by Derek Tsang
André Picard @picardonhealth @picardonhealth.bsky.social · 22/05/2025
License to kill: The pandemic on our roads. The number of victims of road violence is catastrophic. The ultimate weapon remains the vehicle, by @donovanadamo.bsky.social healthydebate.ca/2025/05/topi... via @healthydebate.bsky.social #VisionZero
healthydebate.ca
License to kill: The pandemic on our roads - Healthy Debate
Many vehicular deaths are preventable. Traffic violence happens frequently but we don’t take these incidents seriously, judicially, socially nor traffic engineering-wise.
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Reposted by Derek Tsang
The Local Magazine @thelocal.to · 22/05/2025
The province says the Toronto District School Board has a spending problem. The board says it’s chronically underfunded. @wencyleung.bsky.social sorts through the numbers. thelocal.to/tdsb-2025-26...
thelocal.to
Understanding the TDSB’s Budget Woes in Five Charts | The Local
The province says the school board has a spending problem. The board says it’s chronically underfunded. We sort through the numbers.
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Derek Tsang @dtsang.ca · 15/05/2025
Let’s build up a better #radonc community here!
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Derek Tsang @dtsang.ca · 14/05/2025
Happy to share our collaboration with Drs Deyell, Gupta and the Canadian Sarcoma Research Collaboration on whole abdominal radiotherapy for children with sarcoma - this is an effective treatment for some patients - doi.org/10.1002/pbc....
doi.org
Whole Abdominal Radiotherapy Is Tolerable and Effective in Children and Young Adults With Intra‐Abdominal Sarcoma: A Canadian Sarcoma Research and Clinical Collaboration (CanSaRCC) Study
Background Whole abdominal radiotherapy (WART) is utilized in children, adolescents, and young adults with intra-abdominal sarcoma, but efficacy and toxicity are uncertain. Methods Sarcoma patient...
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Derek Tsang @dtsang.ca · 12/05/2025
History of the Paediatric Radiation Oncology Society: doi.org/10.1002/pbc.... #pros
doi.org
Twenty Years of the Paediatric Radiation Oncology Society
In 2005, the Paediatric Radiation Oncology Society (PROS), a multi-professional association to promote radiotherapy for children and young people, was created. Its mission has been to educate those i....
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Reposted by Derek Tsang
André Picard @picardonhealth @picardonhealth.bsky.social · 03/05/2025
Where is Public Health? Last week, I was writing about #measles spreading in Ontario and Alberta and the invisibility of public health officials there. www.theglobeandmail.com/canada/artic... CBC News has more on the topic today, including this observation. www.cbc.ca/news/health/...
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Derek Tsang @dtsang.ca · 03/05/2025
Proud to see former clinical fellow Dr Nisha Shariff present the @pmresearch-uhn.bsky.social experience on #reirradiation for children with #brainstem glioma showing a survival benefit to reRT! Great work, Dr Shariff. #estro25
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Derek Tsang @dtsang.ca · 28/04/2025
I’m a #radonc here!
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Derek Tsang @dtsang.ca · 28/04/2025
👋
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Josh Matlow @joshmatlow.bsky.social · 25/04/2025
Sign the Petition to Save Our School Pools! A report in the TDSB agenda, just released, proposes closing all 66 school pools, included 27 permitted by the City of Toronto, in Toronto’s public schools due to funding cuts from the Province…
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