Spots Global Cancer Trial Database for Doxycycline in Cutaneous Schwannoma (NF2)

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Trial Identification

Brief Title: Doxycycline in Cutaneous Schwannoma (NF2)

Official Title: Doxycycline Injection of Cutaneous Schwannoma in Neurofibromatosis Type 2

Study ID: NCT05521048

Conditions

Neurofibromatosis Type 2

Interventions

Doxycycline Injection [Doxy]

Study Description

Brief Summary: In this research study the investigators want to learn more about an alternate, local treatment for skin schwannomas. Specifically, local doxycycline intra-tumoral injection will be performed as a potential treatment for NF2-related skin schwannomas, ultimately reducing the risks and costs associated with standard surgical removal of such skin tumors if successful.

Detailed Description: Study Design: Interventional Clinical Trial, single-arm, open-label Estimated Enrollment: Up to 19 participants with NF2-associated cutaneous or subcutaneous schwannomas Aims: To demonstrate change in peripheral schwannoma size following direct injection into the tumor with doxycycline hyclate. Nineteen neurofibromatosis type 2-associated peripheral cutaneous or subcutaneous schwannomas between 0.5 cm and 4 cm in greatest diameter will be diagnosed clinically, photographed for documentation of location, and injected with between 0.1 ml to 4 ml of 10mg/ml doxycycline hyclate (Fresenius Kabi, Canton, MA). A maximum of three tumors per patient will be injected. The dose administered will be calculated based on tumor size, not to exceed the estimated volume of the tumor or a maximum of 4 ml. The tumor volume will be estimated by electronic caliper measure of the greatest tumor diameter (D). (V=4/3piR3 where R is the radius (R=D/2) is measured in millimeters and the dose calculated by Vmm3/1000 = injection volume in milliliters). Repeat measures will be made at 6-months and 1-year follow up (+/- 1 month) and documented with electronic calipers and photography. Injection of 1% lidocaine may be given pre-doxycycline to reduce injection pain. Outcome: The primary outcome will be longitudinal change in tumor maximal diameter measured at 6-months and 1-year compared to baseline defined by a change of 25%. Secondary endpoints include patient reports of paresthesia, pain, skin breakdown or discoloration. Exploratory endpoints will be the change in the sum of maximal diameters.