The Efficacy of Topical Timolol Combined With Cryotherapy in EGFR Inhibitors-induced Paronychia - a Double-blinded, Intrapatient Left-to-right Controlled Study

Taipei Medical University

Status: Completed

Conditions: Paronychia; Epidermal Growth Factor Receptor Inhibitor

Treatments: Procedure: Cryotherapy with liquid nitrogen; Drug: Timolol maleate 0.5% ophthalmic solution

Study type: Interventional

Funder types: Other

Identifiers

NCT05165082

N202104033

Details and patient eligibility

About

Background: EGFR inhibitors (EGFRi) have been used to treat a wide variety of cancers nowadays. One of the major side effects of EGFRi is paronychia, which was not fatal but may caused huge negative impact on patient's daily activities. Current guidelines regarding EGFRi-induced paronychia suggested treatment with cryotherapy, topical corticosteroid or surgical intervention for Common Terminology Criteria for Adverse Events (CTCAE) grade 2 to grade 3 lesions. Recent studies showed that topical beta-blockers may be effective treatment for EGFRi- induced paronychia. However, the evidence was limited to case series and there was no randomized trials evaluating the efficacy.

Goal: To evaluate whether topical timolol combined with cryotherapy was more effective than cryotherapy alone in treating EGFR inhibitors-induced paronychia.

Method: In this single center, randomized, double-blinded, left-to-right comparison study, we plan to enroll 35 patients with EGFR inhibitors-induced paronychia. Patients eligible to enter this study should be over the age of 20 having at least one finger or toe involved with CTCAE grade 2~3 paronychia on each of their hands or feet. The paronychia should have no indication for surgical treatment. After enrollment, one physician will randomize the hands or feet to either timolol-plus-cryotherapy group or cryotherapy-alone group using a computer-generated random allocation scheme. The side allocated to the timolol-plus-cryotherapy group will receive topical timolol solution twice daily (since the beginning of the allocation and continue for 8 weeks) and topical cryotherapy with liquid nitrogen every other week (at the allocation day, at the 2nd week, 4th week and 6th week after the beginning of the trial). The other side allocated to cryotherapy-alone group will receive placebo (normal saline) twice daily (since the beginning of the allocation and continue for 8 weeks) and topical cryotherapy with liquid nitrogen every other week (at the allocation day, at the 2nd week, 4th week and 6th week after the beginning of the trial). In the treatment phase, patients may receive additional local or systemic antibiotics according to the dermatologist's clinical judgement, but they can not receive topical silver nitrate, trichloroacetic acid or corticosteroid ointment. Patients are evaluated at baseline, at 2, 4, 6 and 8 weeks after the initiation of treatment. Efficacy endpoints include CTCAE grade, scoring system for paronychia related to oncologic treatments (SPOT) and physician global assessment, which are evaluated by a blinded investigator based on digital photos, and pain VAS score and patient global assessment, which are evaluated by questionnaire to the patients.

Enrollment: 8 patients

Sex: All

Ages: 20+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• EGFR inhibitors-induced paronychia
• Older than 20 years
• Having at least one finger or toe involved with CTCAE grade 2~3 paronychia on each of their hands or feet

Exclusion criteria

• Indication for surgical treatment
• Medical history of asthma, severe COPD, sinus bradycardia, SA block, 2nd to 3rd degree AV conduction delay, heart failure, cariogenic shock or allergy to timolol

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Quadruple Blind

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8 participants in 2 patient groups, including a placebo group

Timolol plus cryotherapy

Experimental group

Description:

Apply topical timolol solution twice daily (since the beginning of the allocation and continue for 8 weeks) and cryotherapy with liquid nitrogen once every other week (on the allocation day, at the 2nd week, 4th week and 6th week after the beginning of the trial).

Treatment:

Procedure: Cryotherapy with liquid nitrogen

Drug: Timolol maleate 0.5% ophthalmic solution

Placebo plus cryotherapy

Placebo Comparator group

Description:

Apply placebo (normal saline) twice daily (since the beginning of the allocation and continue for 8 weeks) and cryotherapy with liquid nitrogen once every other week (on the allocation day, at the 2nd week, 4th week and 6th week after the beginning of the trial).

Treatment:

Procedure: Cryotherapy with liquid nitrogen