A Study of Olaratumab (LY3012207) in Participants With Advanced Soft Tissue Sarcoma

Inclusion Criteria

• The participant may have no more than 2 prior lines of systemic therapies (neoadjuvant and adjuvant therapies will not be considered as a prior line of therapy) for advanced or metastatic disease and is suitable to receive gemcitabine and docetaxel therapy. All previous therapies must have completed ≥ 3 weeks (21 days) prior to first dose of study drug.
• In the Phase 2 part, prior olaratumab/doxorubicin combination therapy in 1 prior treatment line is allowed.
• Prior olaratumab therapy must have been received with doxorubicin as indicated on the olaratumab label.
• Prior olaratumab therapy must have included at least 2 full cycles of olaratumab/doxorubicin (that is, a minimum of 4 doses of olaratumab).
• Participants, who completed at least 2 cycles of combination olaratumab/doxorubicin therapy then discontinued doxorubicin due to toxicity or maximum dosing and proceeded to olaratumab monotherapy, are eligible.
• The most recent dose of olaratumab must have been received within 180 days of randomization in this study.
• Availability of tumor tissue is mandatory for study eligibility. The participant must have consented to provide archived formalin-fixed paraffin-embedded tumor tissue or be subject to a pre-treatment re-biopsy of primary or metastatic tumor tissue for future central pathology review and translational research (if archived tissue is unavailable).
• The participant has adequate hematologic, organ, and coagulation function within 2 weeks (14 days) prior to enrollment (Phase 1b) or randomization (Phase 2).

Exclusion Criteria

• The participant is diagnosed with gastrointestinal stromal tumor (GIST) or Kaposi sarcoma.
• The participant has active central nervous system (CNS) or leptomeningeal metastasis (brain metastasis) at the time of enrollment (Phase 1b) or randomization (Phase 2). Participants with a history of a CNS metastasis previously treated with curative intent (for example, stereotactic radiation or surgery) that have not progressed on follow-up imaging, have been asymptomatic for at least 60 days, and are not receiving systemic corticosteroids and or/anticonvulsants, are eligible. Participants with signs or symptoms of neurological compromise should have appropriate radiographic imaging performed before enrollment (Phase 1b) /randomization (Phase 2) to rule out brain metastasis.
• The participant has received prior treatment with gemcitabine or docetaxel. Note: Participants previously enrolled in the I5B-MC-JGDJ (NCT02451943) or any other blinded study with olaratumab are not eligible to participate in this trial.
• The participant has electively planned or will require major surgery during the course of the study.
• Females who are pregnant or breastfeeding.
• The participant has an active fungal, bacterial, and/or known viral infection including human immunodeficiency virus (HIV) or viral (A, B, or C) hepatitis (screening is not required).