Low-dose Nivolumab Injections Shrink Precancerous Oral Lesions

Direct injection of a debased dose of nan immune checkpoint inhibitor nivolumab into precancerous oral lesions importantly reduced lesion size and consequence of crab progression, sparing astir patients from surgery. This caller investigation from The University of Texas MD Anderson Cancer Center suggests a caller attack to oral crab prevention done immune interception.

Results from nan first-in-human Phase I proceedings were presented coming astatine nan American Association for Cancer Research (AACR) Annual Meeting 2026 by main interrogator Moran Amit, M.D., Ph.D., adjunct professor of Head & Neck Surgery. The study explored nan feasibility and efficacy of up to 4 doses of intralesional immunotherapy pinch nivolumab for patients pinch mild to terrible oral dysplasia.

"The truth that we were capable to forestall room successful nan immense mostly of patients is simply a beardown denotation that those lesions changed from bad players to thing patients tin unrecorded pinch and that we tin simply show closely," Amit said. "We are encouraged by these results showing that locally administered immunotherapy is effective successful not only preventing these lesions from progressing but besides successful reducing their consequence of progression, opening an avenue for crab prevention that we didn't cognize existed before."

More accusation connected each UT MD Anderson AACR Annual Meeting contented tin beryllium recovered astatine MDAnderson.org/AACR. 

What is nan existent modular of attraction for precancerous oral lesions?

Precancerous oral lesions are asymptomatic, abnormal compartment changes successful nan mouth. Depending connected nan level of compartment abnormality, aliases dysplasia, precancerous lesions tally nan consequence of progressing to oral cancer, but location is nary known biomarker for determining which lesions will go cancer. Standard of attraction for these patients is to surgically region aliases ablate nan lesions arsenic a intends of prevention.

While clinicians effort to minimize really overmuch of nan oral cavity is removed, location are nary established approaches for preserving tissue. Two retired of each 3 patients person aggregate lesions that tin besides recur aft removal, often resulting successful aggregate surgeries that region overmuch of nan rima and tongue. This leaves galore patients pinch trouble swallowing, speaking and eating, and facing different debilitating symptoms that trim their value of life.

How does nan existent study build upon erstwhile research?

Previous studies person shown that utilizing systemic intravenous (IV) nivolumab, an anti-PD-1 monoclonal antibody, tin trim nan size of these lesions and their consequence of progression. However, this attack involves a reasonably precocious dose of nivolumab that besides comes pinch toxicities that are considered excessive for patients without cancer.

These studies led Amit and colleagues to creation a Phase I objective proceedings utilizing a overmuch little dose of nivolumab – 2-4% of nan systemic dose – injected straight into nan lesion. The proceedings enrolled 29 patients pinch astatine slightest 1 oral lesion wished to person a precocious consequence of progression. Of these, 15 patients had high-grade, aliases severe, dysplasia, and 14 patients had low-grade, aliases mild, dysplasia. Patients received either 10 aliases 20 mg of nivolumab injected straight into their lesions each week for 4 cycles.

What wherever nan cardinal results of this objective trial?

On nan study, 85% of patients knowledgeable a alteration successful lesion size aft a median follow-up of 14.5 months, pinch an wide mean of 60% simplification successful size, while 19 patients (65%) knowledgeable reductions greater than 50%.

Twelve patients (41%) had their lesions downgraded successful severity grade, and six patients had nary signs of dysplasia aft follow-up, meaning they achieved a complete pathologic response. All isolated from 4 patients completed nan full trial.

Only six of nan treated lesions progressed to crab and, because these were detected early, were surgically removed. No different patients required further surgical resection. There were nary dose-limiting broadside effects, and astir adverse events were people 1 aliases 2, pinch 1 lawsuit each of diarrhea, hyperglycemia and acidosis.

Importantly, patient-reported outcomes showed a overmuch higher value of life based connected caput and neck-related symptoms, specified arsenic swallowing, rima soreness, connection and taste.

How does this curen alteration nan antitumor immune response?

Tissue samples from treated lesions had a greater infiltration of CD4 and CD8 T cells, arsenic good arsenic different indicators of immune activation, whereas untreated lesions from nan aforesaid patients did not. Pharmacokinetic analyses demonstrated little than 10 micrograms per milliliter of nivolumab successful humor samples, which is substantially little than pinch systemic administration.

"When fixed systemically, only a fraction of nan supplier ends up successful nan target lesion," Amit explained. "By injecting consecutive into nan lesion, we tin springiness a fraction of nan afloat dose because nan bioavailability is 100% delivered wholly into wherever it's needed, perchance bypassing systemic vulnerability and sparing toxicities."

What implications does this person for precancer curen and prevention?

The results show that nivolumab injected straight into precancerous oral lesions is safe and well-tolerated and could beryllium an effective intends of preventing progression done immune intervention.

Interestingly, precancerous lesions originate successful galore different types of cancers – including skin, cervical and colon – suggesting that section immunotherapy management could perchance service arsenic a prevention method for those cancers, arsenic well.

While this Phase I proceedings focused connected only treating 1 lesion, a placebo-controlled Phase II proceedings is presently being planned to let nan targeting of aggregate lesions astatine once.

"Ultimately, nan extremity is to thief patients debar repeated surgeries aliases excessive curen and sphere their value of life, particularly erstwhile they don't yet person cancer," Amit said. "Continuously removing parts from nan oral cavity tin lead to important issues that impact value of life, truthful this attack would beryllium a important advancement complete nan existent modular of care."