PMID- 38201496 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20240114 IS - 2072-6694 (Print) IS - 2072-6694 (Electronic) IS - 2072-6694 (Linking) VI - 16 IP - 1 DP - 2023 Dec 22 TI - A New Hypothesis Describing the Pathogenesis of Oral Mucosal Injury Associated with the Mammalian Target of Rapamycin (mTOR) Inhibitors. LID - 10.3390/cancers16010068 [doi] LID - 68 AB - It has been 24 years since rapamycin (sirolimus) was approved to mitigate solid organ transplant rejection and 16 years since mTOR (mammalian/mechanistic target of rapamycin) inhibitors reached patients as a cancer therapy. While the clinical benefits of mTOR inhibitors (mTORi) are robust, so too are their toxicities. Among the most common issues is the development of ulcers of the oral mucosa (mTOR-inhibitor associated stomatitis; mIAS). These lesions are distinct from those of other anti-cancer agents, occur with regularity, and impact patient outcomes. mIAS' pathogenesis has been the subject of speculation, and its similar presentation to recurrent aphthous stomatitis (RAS) has led to the hypothesis that it might serve as a surrogate to better understand RAS. Based on a review of the literature, the current manuscript provides a hypothesis regarding the mechanisms by which mTORis uniquely initiate mucosal injury and an explanation for the observation that steroids (also an immunosuppressive) are effective in its treatment through a non-immunologic mechanism. Unexplained unique features of mIAS are discussed in this review in the context of future investigation. FAU - Sonis, Stephen T AU - Sonis ST AD - Divisions of Oral Medicine and Dentistry, Brigham and Women's Hospital and the Dana-Farber Cancer Institute, Boston, MA 02115, USA. AD - Department of Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston, MA 02114, USA. AD - Biomodels, LLC, Waltham, MA 02451, USA. FAU - Villa, Alessandro AU - Villa A AUID- ORCID: 0000-0002-1966-6000 AD - Oral Medicine, Oral Oncology and Dentistry, Miami Cancer Institute, Miami, FL 33176, USA. AD - Herbert Wertheim College of Medicine, Florida International University, Miami, FL 33199, USA. LA - eng PT - Journal Article DEP - 20231222 PL - Switzerland TA - Cancers (Basel) JT - Cancers JID - 101526829 PMC - PMC10777973 OTO - NOTNLM OT - aphthous OT - cancer OT - everolimus OT - mTOR inhibitor OT - oral ulceration OT - rapamycin COIS- Sonis is an employee of Biomodels, LLC and Primary Endpoint Solutions, LLC. Both companies assist industry, government and academics to study and enable drugs, biologicals and devices to treat patients with a variety of indications, including cancer and the side effects and toxicities of its treatment. Sonis does not have interests in any of the companies with which either organization works. Alessandro Villa is a consultant for Primary Endpoint Solutions, LLC. EDAT- 2024/01/11 07:43 MHDA- 2024/01/11 07:44 PMCR- 2023/12/22 CRDT- 2024/01/11 01:06 PHST- 2023/11/27 00:00 [received] PHST- 2023/12/13 00:00 [revised] PHST- 2023/12/15 00:00 [accepted] PHST- 2024/01/11 07:44 [medline] PHST- 2024/01/11 07:43 [pubmed] PHST- 2024/01/11 01:06 [entrez] PHST- 2023/12/22 00:00 [pmc-release] AID - cancers16010068 [pii] AID - cancers-16-00068 [pii] AID - 10.3390/cancers16010068 [doi] PST - epublish SO - Cancers (Basel). 2023 Dec 22;16(1):68. doi: 10.3390/cancers16010068.