Inclusion Criteria:

          -  Is willing and able to provide written informed consent for the trial.

          -  Has histological confirmation of breast carcinoma.

          -  Has confirmed inflammatory breast cancer by using international consensus criteria:

               -  Onset: Rapid onset of breast erythema, edema and/or peau d'orange, and/or warm
                  breast, with/without an underlying breast mass.

               -  Duration: History of such findings no more than 6 months.

               -  Extent: Erythema occupying at least 1/3 of whole breast.

               -  Pathology: Pathologic confirmation of invasive carcinoma.

          -  Did not achieve pathological complete response (pCR) to any chemotherapy that was
             given with the intention to induce best response prior surgery. pCR is defined as the
             current American Joint Committee on Cancer (AJCC) breast cancer staging.

          -  Is HER2 normal, defined as HER2 0 or 1+ by immunohistochemistry (IHC) and negative by
             fluorescence in situ hybridization (FISH) if performed; or HER2 is 2+ by IHC and
             negative by FISH; or HER2 negative by FISH if IHC is not performed.

          -  Has positive estrogen receptor (ER) or progesterone receptor (PR) status. ER or PR >=
             10%.

          -  Has a performance status of 0-1 on the Eastern Cooperative Oncology Group (ECOG)
             performance scale.

          -  Absolute neutrophil count (ANC) >= 1,500/mcL.

          -  Platelets >= 100,000 /mcL.

          -  Hemoglobin (Hgb) >= 9 g/dL.

          -  Creatinine levels < 1.5 x upper limit of normal (ULN).

          -  Total bilirubin =< 1.5 x ULN.

          -  Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) =< 2.5 x ULN.

          -  Subjects of reproductive potential must agree to avoid becoming pregnant or
             impregnating a partner, respectively, while receiving study drug and for 120 days
             after the last dose of study drug by complying with one of the following: (1) practice
             abstinence from heterosexual activity; OR (2) use (or have their partner use)
             acceptable contraception during heterosexual activity. Acceptable methods of
             contraception are: Single method (one of the following is acceptable): (1)
             intrauterine device (IUD); (2) vasectomy of a female subject's male partner; (3)
             contraceptive rod implanted into the skin. Combination method (requires use of two of
             the following): (1) diaphragm with spermicide (cannot be used in conjunction with
             cervical cap/spermicide); (2) cervical cap with spermicide (nulliparous women only);
             (3) contraceptive sponge (nulliparous women only); (4) male condom or female condom
             (cannot be used together); (5) hormonal contraceptive: oral contraceptive pill
             (estrogen/progestin pill or progestin-only pill), contraceptive skin patch, vaginal
             contraceptive ring, or subcutaneous contraceptive injection

          -  Female subjects will be considered of non-reproductive potential if they are either:

               -  Postmenopausal (defined as at least 12 months with no menses without an
                  alternative medical cause; in women < 45 years of age a high follicle stimulating
                  hormone (FSH) level in the postmenopausal range may be used to confirm a
                  post-menopausal state in women not using hormonal contraception or hormonal
                  replacement therapy. In the absence of 12 months of amenorrhea, a single FSH
                  measurement is insufficient.); OR

               -  Have had a hysterectomy and/or bilateral oophorectomy, bilateral salpingectomy or
                  bilateral tubal ligation/occlusion, at least 6 weeks prior to screening; OR

               -  Has a congenital or acquired condition that prevents childbearing.

          -  Male subjects will be considered to be of non-reproductive potential if they have
             azoospermia (whether due to having had a vasectomy or due to an underlying medical
             condition)

          -  Has negative serum or urine pregnancy test for subjects of childbearing potential
             within 10 days before first dose.

          -  Have completed radiation (if candidate for post-mastectomy radiation) or plans to
             begin radiation and endocrine therapy within 28 days.

          -  If patient has already started hormonal blockade therapy after radiation as adjuvant
             therapy, the patient is eligible as long as the hormonal therapy was initiated no more
             than 6 months by the time of screening and can start the study drug within 4 weeks
             since the completion of screening.

        Exclusion Criteria:

          -  Is currently participating in a study of an investigational anti-cancer agent.

          -  Has a diagnosis of immunodeficiency or any other form of immunosuppressive therapy.

          -  Has not recovered from adverse events due to prior therapies, i.e. monoclonal
             antibody, chemotherapy, targeted small molecule therapy, radiation therapy, or
             surgery.

               -  Note: Subjects with grade 2 neuropathy, alopecia and general disorders and
                  administration site conditions (per Common Terminology Criteria for Adverse
                  Events [CTCAE] version 4.0) are an exception to this criterion and may qualify
                  for the study.

          -  Has a known history of prior malignancy with the exception of basal cell carcinoma of
             the skin, superficial bladder cancer, squamous cell carcinoma of the skin, or in situ
             cervical cancer, and has undergone potentially curative therapy and has no evidence of
             recurrence over the last 1 year since completion of curative therapy.

          -  Has an active autoimmune disease requiring systemic treatment within the past 3 months
             or a documented history of clinically severe autoimmune disease, or immunosuppressive
             agents. Subjects with vitiligo or resolved childhood asthma/atopy would be an
             exception to this rule. Subjects that require intermittent use of bronchodilators,
             inhaled steroid or local steroid injections to the skin would not be excluded from the
             study. Subjects with hypothyroidism stable on hormone replacement or Sjogren's
             syndrome will not be excluded from the study.

          -  Has a history of (non-infectious) pneumonitis that required steroids or current
             pneumonitis.

          -  Has an active infection requiring systemic therapy.

          -  Has known psychiatric or substance abuse disorders that would interfere with
             cooperation with the requirements of the trial.

          -  Has received prior therapy with an anti-PD-1, anti-PD-L1, anti-PD-L2, anti-CD137, or
             anti-cytotoxic T-lymphocyte-associated antigen-4 (CTLA-4) antibody (including
             ipilimumab or any other antibody or drug specifically targeting T-cell co-stimulation
             or checkpoint pathways).

          -  Has a known history of human immunodeficiency virus (HIV).

          -  Has a known active hepatitis B or hepatitis C.

          -  Have received a live vaccine within 30 days prior to the first dose of trial
             treatment.

          -  Gastrointestinal tract disease or defect or previous history of colitis.

          -  Has proven or suspected distant metastasis that involves occurrence of breast cancer
             outside of locoregional breast and lymph nodes area.

          -  Subjects requiring daily corticosteroids either via oral route of administration (po)
             or infusion.

          -  Myocardial infarction within 6 months before starting therapy, symptomatic congestive
             heart failure (New York Heart Association > class II), unstable angina, or unstable
             cardiac arrhythmia requiring medication.