Topical treatment of anal condylomata with Propionibacterium acnes lysate: results of a multicentric observational study

BACKGROUND: Condylomata are a manifestation of HPV infection of the ano-genital epithelium. Recurrence is frequent after any type of treatment (from 20% up to 50%). We assessed the use of a gel containing panthenol, tocopheryl acetate and Propionibacterium extract in the treatment of anal warts.METHODS: Enrollment period was from January 15 to June 15, 2018. Main exclusion criteria were immunodepression, extensive condylomatosis and other treatments (topical/ablative) in the previous six months. RESULTS: Seventy-nine patients were included. Median age was 33 years (19-65), 72.2% were males. Median number of partners and symp-toms duration were 6 (1-98) and 3 months (1-18), respectively. Almost all cases had perianal disease (97.5%), while endoanal warts were present in 51.9% of cases. After 30 days of treatment, complete regression occurred in 17 (21.5%) patients, while partial or absent response was reported in 36 (45.6%) and 26 (32.9%) cases, respectively. Forty-seven (59.5%) patients underwent a second month of topical therapy. After a 6-month follow-up, complete or partial response was reported in 53 (67.1%) patients, while in 26 (32.9%) cases the disease remained stable or even wors-ened. Nineteen (24.1%) patients required cryotherapy, 23 (29.1%) surgical excision, while 2 (2.5%) needed both cryotherapy and surgery. Ab-sence of clinical response was associated with a number of partners >10 and symptoms duration of 6 months or shorter (P<0.001 and P=0.050).CONCLUSIONS: In our study, the gel containing P. acnes lysate was a safe topical treatment for perianal and endoanal condylomata and could help to overcome HPV infection. A high number of partners and short symptoms duration appeared to worsen the outcome.