Sebastian Niezen MD, MMSc

Boston ‼️ Finally here for the #TLM23 @AASLDFoundation @AASLDtweets Excited to meet and learn from all my #liver friends and Emerging Liver Scholar co-awardees 🙏🏼 🙏🏼 #livertwitter @PittGIM @PittIMChiefs @PittDeptofMed

Excited to share our new study: “LuRa” What happens after Lu-PSMA in mCRPC? We evaluated Radium-223 after [177Lu]Lu-PSMA-617 in heavily pretreated mCRPC patients. sciencedirect.com/science/articl…

Today we celebrate World Liver Day 💚 To everyone living with liver disease: we hear you, we see you, and you’re not alone. And for those affected by rare diseases, today is a reminder to keep raising awareness and pushing for change. #WorldLiverDay #RareDiseaseAwareness

Hepative Venous Pressure Gradient (HVPG): Its indicates place of obstruction: 1. No inflow: PV is obstructed, so flow in HV🔻, gradient normal 2. No outflow: HV is obstructed, stasis throughout, gradient normal 3. Cirrhosis: PV has resistance, HV normal, gradient is high

@brittybb @DDWMeeting @AmerGastroAssn Congratulations Britt! Very well deserved 🙏🏼🙏🏼🙏🏼

Excited that our work was selected for a DDW abstract award for the upcoming meeting @DDWMeeting @AmerGastroAssn #DDW2026 #DDWmeeting

@AAcosta_MedMD @MayoHemeOnc Congratulations Aldo! Very well deserved!

Feels unreal that <6y ago I was a newly graduated IMG coming to this amazing institution as a Research Trainee 🥲 Thank you @MayoHemeOnc and all of my amazing mentors… it truly has taken a village 😭 #SiSePuede #LatinXinMed #IMG

Pleased to share our latest study: Rare Gain-of-Function Variants in IDH1 and IDH2 Confer Increased Risk of Immune-Mediated Rheumatic Diseases acrjournals.onlinelibrary.wiley.com/doi/10.1002/ac…

I don’t get mad at folks for exalting lifestyle medicine over pharmacology. I was once one of those. I thought diet and exercise could cure everything. I was fortunate enough to be able to be skeptical of my own ways. Today, I give value to both in equal measures.

@UPMCHeme_Onc @PittDeptofMed @RandolphLydePhD @RyanSweeneyMD @RandolphLydePhD so proud of you sir! The program is so lucky to have you as chief. Congratulations 🙌🏻🙌🏻🙌🏻

🎉 We’re thrilled to announce Dr. Randolph Lyde MD, PhD and Dr. Ryan Sweeney MD as our new Chief Fellows for coming academic year! Your leadership, dedication, and commitment to our program are truly inspiring. Here’s to a bright and exciting year ahead!✨#Congrats #ChiefFellows

📣IM residents, GI fellows, and incoming fellows - join the growing @AASLDtweets LFN team 📚 🤝 Contribute to high-impact medical education and collaborate with a national community! Share your work and showcase at national conferences 🚀 Application Deadline: Tuesday, March 31🗓️

@Moises_SdM @TradIMYale Felicidades Moi! Que orgullo! Muy merecido 🙌🏻🙌🏻🙌🏻

Thrilled to share that I matched at @TradIMYale I'm deeply grateful to all my mentors, colleagues, friends, and family for their support throughout this journey. Excited for this new chapter ahead! #Match2026 #InternalMedicine

@andresinzunzamd @d_ramonfaur @bcmhouston @TheNRMP @gabypeof Muchas felicidades! Lo mejor a los dos 🫶🏽🫶🏽

Dreams come true! We couples matched at our #1 @bcmhouston Eight years ago we met in med school. Four USMLEs, two master’s degrees, and one big move later… we MATCHED🧠 So grateful to everyone who made our dream in the U.S. possible. #match2026 @TheNRMP @gabypeof

@ebtapper I double down on cprs

Nothing good will come from the transition to Cerner from CPRS I am sorry to say

@AmJGastro @AmCollegeGastro @TelbanyMD @EvelynInga3 @swathipaleti @MLongMD @JasmohanBajaj @theliverdoc

Liver Cleansing Imposters: An Analysis of Popular Online Liver Supplements Telbany, et al. 📕 doi.org/10.14309/ajg.0… @TelbanyMD @EvelynInga3 @swathipaleti @MLongMD @JasmohanBajaj

⭐️Excited to share our latest publication: machine-learning model finds that balloon expulsion test is the 🥇 predictor of dyssynergic defecation (OR 27.3), with PPV >80%. journals.lww.com/ajg/abstract/9…

Couldn’t be more proud of my friend and colleague Rahul! Happy to have him join us next year @BIDMC_GI Congratulations sir!

@dogakahramangil @ConquerCancerFd @ASCO @IbrahimSahinMD1 @PittGIM Congrats Doga! What a titan 🫰🏼

Grateful to present our work on KRAS-mutant colorectal cancer at #GI26, and honored to receive the Conquer Cancer Merit Award. @ConquerCancerFd @ASCO Thank you @IbrahimSahinMD1 so much for this opportunity and your mentorship (and the breakfast as always 😊)!

New SRTR reports are out! Beth Israel was 3rd best in the U.S. and #1 in the Northeast 2025: 121 transplants | 10 living donors | 152 waitlisted 400× higher transplant rate and 50% lower mortality than expected. If you need liver care, BIDMC is the place to be. Proud to be part of this team! @BIDMChealth @BIDMC_Medicine

@HannahWFiske @ACGCRJ @Yale @YaleDigestive @BrownMedicine @ThiruMunirajMD @clivejmiranda @JosephHabibi_MD @DrSamirAShah1 @yaransarkis @EBGIdoc @PrashanthVall12 @AmCollegeGastro @SJMagierMD Really inspiring Hannah! Hope you get better soon and congratulations!

🚨Dysphagia aortica is rare but an important not-to-miss dx Proud to share our📝in @ACGCRJ - a personal piece, as I was the patient🫀 Deeply grateful to my physicians @Yale & colleagues @YaleDigestive + @BrownMedicine for their endless support this year bit.ly/hwfg