Inclusion Criteria:

- Signed and dated informed consent form before any protocol-specific screening
procedures

- Histologically confirmed diagnosis of epithelial ovarian cancer, fallopian tube, or
primary peritoneal cancer, Fédération Internationale de Gynécologie et d'Obstétrique
(FIGO) stage IIb - IV

- Optimal or sub-optimal cytoreductive surgery

- Clinical complete response to platinum and taxane-based therapy consisting of at
least four cycles, based on computed tomography (CT) scan and a CA-125 (cancer
antigen 125) level below 35 U/mL

- Age ≥18 years

- Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1

- Last dose of platinum and taxane-based therapy completed within 6 weeks prior to the
start of catumaxomab treatment

- Negative serum pregnancy test result at screening in women of childbearing potential
(applies to patients without documented menopause or sterility)

- Willingness of patients of childbearing potential to use an effective contraceptive
method (i.e. oral contraceptive, cervical cap, diaphragm with spermicide, condom with
spermicide, or intrauterine device) during the study and for at least 6 months after
the last infusion

Exclusion Criteria:

- Acute or chronic systemic infection

- Exposure to chemotherapy, radiotherapy, immunotherapy or investigational anti-cancer
therapy within 6 weeks of first dose of catumaxomab other than last regimen of
platinum and taxane chemotherapy as outlined in protocol

- Known human immunodeficiency virus (HIV) infection

- Previous treatment with non-humanized murine (rat or mouse) monoclonal antibodies
(mAb)

- Inadequate renal function (creatinine > 1.5 x upper limit of normal [ULN])

- Inadequate hepatic function:

- Alanine aminotransferase (ALT) > 2.5 x ULN or

- Aspartate aminotransferase (AST) > 2.5 x ULN or

- Bilirubin > 1.5 x ULN

- Platelets < 100,000 cells/mm^3

- Absolute neutrophil count (ANC) < 1,500 cells/mm^3

- History of myocardial infarction, congestive heart failure or relevant cardiac
arrhythmia within the last 6 months

- No other malignancy within the past 5 years except non-melanoma skin cancer or
carcinoma in situ of the cervix if adequately treated

- No history of brain metastases

- Any further condition or disease that would, in the opinion of the Investigator,
expose the patient to undue risk