title: Comparing treatment response and complications between podophyllin 0.5%/0.25% in ethanol vs podophyllin 25% in tincture benzoin for penile warts.
abstract: OBJECTIVE
  The aims of this study were to: 1) ascertain if podophyllin resin in 0.5% [PE(0.5%)] and 0.25% [PE(0.25%)] in ethanol (PE) self-applied sequentially for 3 days with 4 days break cycle is as effective as supervised podophyllin 25% in tincture benzoin (PB) applied in the clinic biweekly in treating penile warts and 2) ascertain if PE causes less skin irritation than PB.
  
  
  RESULTS
  The clearance rate of penile warts was 36.4% (4/11) in PE (0.5%) treated group, 66.7% (4/6) in the PE (0.25%) treated group and 33.3% (6/18) for PB treated group after 1 week (ns). The wart clearance rate at 6 weeks for PE (0.5%) treated group, PE (0.25%) treated group and PB treated group were 81.8% (9/11), 100% (6/6) and 83.3% (15/17) respectively (ns). There were 47 individual warts on the penis of the 17 patients in the PE treated group and 58 individual warts on the penis of the 18 patients in the PB treated group. Based on the response of individual warts to the 2 treatment regimens, the clearance rate was 42.6% (20/47) for the PE treated group and 25% (15/56) for the PB treated group after 1 week treatment (ns). At 6 weeks follow-up, the clearance rate for the PE treated group and the PB treated group were 85.1% (40/47) and 73.2% (41/56) respectively (ns). Skin irritation including superficial erosions, pain and itch were observed in 47% (8/17) in patients treated with PE compared to 38.9% (7/18) in patients treated with PB (ns) during the 6 weeks follow-up period. The clearance rate of patients treated with PE (0.25%) was compared to those treated with PE (0.5%). Four out of six of PE (0.25%) treated patients had clearance of warts after 1 week and 100% clearance at the end of 6 weeks. None experienced any skin irritation.
  
  
  CONCLUSIONS
  This study demonstrates that 0.5% podophyllin (and possibly 0.25% podophyllin) in ethanol is effective in eradicating penile warts. It can be used by patients for self-treatment at home with greater convenience and is more cost effective than the conventional podophyllin 25% in tincture benzoin paint.
authors.affiliation: National Skin Centre, Singapore.
authors.forename: C L
authors.initials: CL
authors.lastname: Goh
authors.forename: C B
authors.initials: CB
authors.lastname: Ang
authors.forename: R K
authors.initials: RK
authors.lastname: Chan
authors.forename: W K
authors.initials: WK
authors.lastname: Cheong
mesh_terms: D000328:Adult; D000368:Aged; D003218:Condylomata Acuminata / Q000188:drug therapy*; D004643:Emollients; D000431:Ethanol; D006801:Humans; D007641:Keratolytic Agents / Q000008:administration & dosage* / Q000009:adverse effects; D008297:Male; D008875:Middle Aged; D010409:Penile Diseases / Q000188:drug therapy*; D010936:Plant Extracts; D011033:Podophyllin / Q000008:administration & dosage* / Q000009:adverse effects; D012997:Solvents; D032362:Styrax
chemical_list: C457659:Benzoin Gum; D004643:Emollients; D007641:Keratolytic Agents; D010936:Plant Extracts; D012997:Solvents; D000431:Ethanol; D011033:Podophyllin