The aim of this study is to determine possible molecular changes on large scale gene expression profiling after treatment with Metvix photodynamic therapy (PDT) of actinic keratoses (AK) and cancerised field in renal transplant recipients.

In this study, the whole target area defined by the investigator will be treated by Metvix PDT: this means that both lesions and sub-clinical lesions will be exposed to Metvix PDT. Biopsies will be performed in both regions: lesional and peri-lesional ones. This will allow us to compare pre and post treatment molecular changes that occurred in these regions and so to evaluate if Metvix PDT acts on the sub-clinical lesions.

Inclusion Criteria:

• Renal transplant with an history of immunosuppression from 5 to 15 years,
• Presenting at least 4 discrete AK lesions, mild or moderate, either on the face, the scalp, forearms or the chest.

Exclusion Criteria:

• At risk in terms of precautions, warnings, and contra-indication referred in the package insert of Metvix®,

• AK lesions clinically atypical or suspicious for malignancy on the target field,

• Any of the following topical treatments within the specified washout period at Screening:

  • 5-FU, Imiquimod, Diclofenac sodium: 3 months,
  • Cryotherapy: 3 months,
  • PDT: 3 months,
  • Other less common AK treatments: 3 months.

• Systemic retinoids within the last month prior to Screening visit.

Only 9 subjects out of 10 planned ones by the protocol have been included

From Screening visit up to Month 15/early termination visit

Questioning of subjects at each follow up visit

No limitation or caveat on this study