Rinse could provide short-term treatment of oral cGVHD

Thirty-two of the patients completed treatment, using the clobetasol rinse for the full 28 days.

Four patients went off study before completing 28 days of treatment. One of these patients could not tolerate the rinse. This patient had gastrointestinal issues that were attributed (by the patient and the physician) to use of the study drug.

Two patients went off study because they could not make it to the NIH for follow-up visits, and 1 patient died. The death was unrelated to the study drug.

Safety

Dr Mays noted that small amounts of clobetasol were detectable in the bloodstream, but she and her colleagues found this was not directly correlated to patient serum cortisol levels.

However, the researchers did observe a significant drop in serum cortisol levels from baseline to day 28, suggesting the rinse has an adrenal impact.

On the other hand, the peripheral lymphocyte profile was unchanged by the use of clobetasol rinse, which suggests there were no significant systemic immunosuppressive effects.

Adverse events considered possibly or probably related to clobetasol rinse included herpes simplex virus reactivation (n=3, grade 2-3), oral candidiasis (n=3, grade 2), other oral viral infection (n=1, grade 2), facial edema (n=3, grade 1), and adrenal suppression (6 grade 1 and 1 grade 2).

Dr Mays noted that many of the patients came on the study with adrenal suppression, but the clobetasol rinse had an additional impact.

Efficacy

The study’s primary endpoint was change in oral cGVHD severity scale at day 28 compared to baseline. Complete response was defined as a score of 0 on the erythema and ulceration components. Partial response was defined as a 25% decrease in score.

Progression was defined as a 25% increase in initial score. Stable disease was defined as a status that does not meet the criteria for progression or response.

Ninety-one percent of patients had a greater than 25% improvement in oral cGVHD severity scale. Nineteen percent of patients had a complete response, 72% of patients had a partial response, and 9% had stable disease. None of the patients progressed.

Dr Mays noted that patients who failed treatment with prior clobetasol ointment responded similarly to the clobetasol rinse when compared with the full study cohort.

Among the 11 patients with prior clobetasol ointment, 18% had a complete response, 73% had a partial response, 9% had stable disease, and none progressed.

Clobetasol rinse significantly decreased the clinical OMRS score (P<0.0001) and improved cGVHD pathology diagnosis (P=0.0001).

Patients reported a significant improvement in oral health-based quality of life (P=0.0008) after completing treatment, as well as significant improvements in oral pain (P=0.017) and oral sensitivity (P=0.0081).

Though saliva production did not change significantly from baseline to day 28, patients reported a significant improvement in oral dryness (P=0.014).

The blinded period of the study showed that placebo treatment was not effective. There was a significant difference between the placebo and clobetasol groups with regard to improvement in OMRS score from baseline to day 14 (P=0.0031).

“We found clobetasol oral rinse to be both effective and safe for short-term treatment of oral mucosal cGVHD and hope that it will improve sparing of systemic immunosuppressants in this patient population,” Dr Mays said. “Its risk profile is generally not suitable for unmonitored, long-term use.”