Tolerance and Performance (Mode of Administration) of Cyto-selective Difluoroethane-based Cryotherapy in the Treatment of Brown Spots
Condition: Lentigo Solar; Senile Lentigo
MeSH terms: Lentigo
Study type: Interventional

Summary: 
      CS5_8 study aim to evaluate the tolerance and to adjust the mode of administration of 2
      different conditions of cryotherapy treatments applied on the brown spots of the face with 1
      prototype (816-v1). Each treatment corresponds to a specific frequency of cryogenic spray
      application.

      The study will evaluate the following prototype :

      • Prototypes from (816-v1 301) to (816-v1 355)
    

Detailed description: 
      Rational :

      Solar/senile lentigo is a harmless patch of darkened skin. It results from exposure to
      ultraviolet (UV) radiation, which causes local proliferation of melanocytes and accumulation
      of melanin within the skin cells (keratinocytes). Solar/senile lentigos or lentigines are
      very common, especially in people over the age of 40 years.

      Solar/senile lentigines are found as groups of similar lesions on sun-exposed sites,
      particularly the face or the back of hands.

      Cryotherapy is more and more used to improve skin appearance and currently used to treat
      lentigo spot. However, the cryogenic gas (conventional cryotherapy - liquid nitrogen) creates
      a dermabrasion of the skin surface and person receiving this kind of treatment presents an
      impaired skin during a few days following the treatment as temporary damage of stratum
      corneum, erythema, scars, burns.

      Following the side effects occurring after conventional cryotherapy application, the Sponsor
      has developed some devices using difluoroethane, manufactured by CRYONOVE PHARMA, already
      available on the local and international markets, e.g. CRYOBEAUTY MAINS and CRYOBEAUTY CORPS.

      To continue it research and development activities, the sponsor selected other sequences of a
      cryogenic spray (1 prototype of devices for face used according to different frequencies of
      application, i.e. 2 conditions evaluated) which could be used for lentigo treatment with a
      same benefit for the consumers without any safety outcomes.

      Design:

      The study performed is a proof of performance designed to be exploratory, interventional
      study, monocentric, randomized and double blinded.

      Intervention :

      1 prototype of devices are evaluated in 2 different conditions. Each treatment corresponds to
      a specific frequency of cryogenic spray application. A total of 42 brown spots are needed (at
      least 1 brown spot on the face).The 42 brown spots will be randomized between the 2
      conditions and will be attributed to subjects according to the number of spots identified by
      Investigator.

      Prototypes (816-v1 301) to (816-v1 355) will be applied on brown pots located on the face.
      Each spot will be treated six times by a defined prototype (always the same device on the
      same spot all along the study) according to specific frequencies (every week or every two
      weeks).

      Prior to any study device application, the dermatologist will assess the adverse events and
      will decide if the period between two consecutive applications should be extended or not.The
      dermatologist will verify that the skin has not been treated by cosmetic products (no
      presence of cream that could interfere with the treatment) and is dry.

      As the study will use prototypes, before each treatment, the prototype will be administered
      to any surface (in order to purge eventually the presence of air). An operator previously
      trained by the dermatologist will apply the study device to the patient's face.

      Subjects will be lying down, and the device will be administered upside down. During
      applications on the face, subjects will wear diving goggles protecting the eyes from
      cryogenic gas.

      The patient follow-up visits are from Day 0 to 6 months.
    

Intervention name(s): Prototypes (816-v1 301) to (816-v1 355) every week; Prototypes (816-v1 301) to (816-v1 355) every two weeks
Intervention type(s): Device; Device
Intervention description(s): Application on brown spots located on the face (6 treatments during the study). An operator previously trained by the dermatologist will apply the study device to the patient's face. Subjects will be lying down, and the prototypes will be administered upside down. During applications, subjects will wear diving goggles protecting the eyes from cryogenic gas.; Application on brown spots located on the face (6 treatments during the study). An operator previously trained by the dermatologist will apply the study device to the patient's face. Subjects will be lying down, and the prototypes will be administered upside down. During applications, subjects will wear diving goggles protecting the eyes from cryogenic gas.
Allocation: Randomized
Intervention model: Sequential Assignment
Masking: Double (Participant, Investigator)
Primary purpose: Treatment
Keywords: cryotherapy; hyperpigmentation; Skin Diseases