Study of the Intradermal Injection of rHuPH20 or Placebo in Subjects With Nickel Allergic Contact Dermatitis

This is a pilot Phase II, prospective, double-blind, placebo-controlled study to compare the
efficacy, safety and tolerability of rHuPH20 or placebo control administered intradermally
(ID) in the prevention and treatment of subjects with contact allergy to nickel. This study
will involve two treatment regimens, which will run in parallel (Treatment Regimens 1 and 2).

Inclusion Criteria:

- Females 18-60 years of age. Females of child-bearing potential must use a standard and
effective means of birth control for the duration of the study.

- Known contact dermatitis to nickel with a confirmed positive patch-test result to
nickel sulfate.

- Intact normal skin without potentially obscuring tattoos, acne, dermatitis,
pigmentation or lesions on the posterior aspect of the torso (back) in the area
intended for allergen testing and dose administration.

- Vital signs (BP, HR, temperature, respiratory rate) within normal range or, if out of
range, assessed by the Investigator as not clinically significant and it is mutually
agreed by both Investigator and Sponsor Medical Monitor that the subject need not be
excluded from the study for this reason.

- A negative serum or urine pregnancy test (if female of child-bearing potential) within
14 days of initial study drug administration.

- Subject should be in good general health based on medical history and physical
examination, without medical conditions that might prevent the completion of study
drug injections and assessments required in this protocol.

- Decision-making capacity and willingness and ability to comply with the requirements
for full completion of the study.

- Signed, written Institutional Review Board (IRB)/EC-approved informed consent.

Exclusion Criteria:

- Nickel allergen patch test greater than a ++ reaction.

- Subjects who were treated with chemotherapy agents or systemic corticosteroids within
the past 3 months.

- Use of topical steroids, antihistamines, or immunosuppressants used near the site of
allergen testing/injection within 14 days.

- Use of oral antihistamines within 14 days of study conduct.

- Extensive ongoing outbreaks of contact dermatitis anywhere on the body.

- Pregnant or women who are breast-feeding.

- Subjects with a current disease state that can affect immune response (e.g., flu,
cancer, HIV).

- Known allergy to any hyaluronidase or the ingredients in the dose preparation.

- History of autoimmune disorder.

- Subjects with any other medical condition that, in the opinion of the investigator,
might significantly affect their ability to safely participate in the study or affect
the conduct of this study. Examples might include asthma, diabetes, heart disease,
epilepsy, cancer, etc.