Infinity Pharmaceuticals, Inc. announced the achievement of four development milestones for IPI-549, oral, immuno-oncology product candidate targeting tumor-associated myeloid cells through selective phosphoinositide-3-kinase-gamma (PI3K-gamma) inhibition, thereby reducing pro-tumor macrophage function and increasing anti-tumor macrophage function. First, the Phase1/1b monotherapy expansion component of the study has been fully enrolled. Second, the combination dose escalation component of the study has been completed. Third, six disease-specific combination expansion cohorts are open to enrollment at the recommended phase 2 dose of 40mg daily of IPI-549 plus Opdivo® (nivolumab) at 240 mg every two weeks in patients with non-small cell lung cancer, melanoma, triple negative breast cancer, head and neck cancer, mesothelioma, and adrenocortical carcinoma. Fourth, the company announced the expansion of its Phase 1/1b clinical trial of IPI-549 to include a combination cohort of IPI-549 plus Opdivo that will enroll patients with high baseline levels of myeloid derived suppressor cells (MDSCs). Studies have shown that poor response to checkpoint inhibitor therapy is correlated with the presence of high baseline levels of MDSCs in cancer patients.12 3 In addition, preliminary translational data from Infinity's Phase 1/1b study demonstrated an association between high baseline levels of MDSCs and clinical responses. Enriching for patients with high MDSCs could lead to improved clinical activity for patients treated with the combination of IPI-549 and anti-PD1. Infinity expects to begin enrolling this combination expansion cohort in patients with high baseline levels of MDSCs in the first quarter of 2018.
Infinity also provided financial guidance for 2018 and outlined anticipated 2018 milestones for the development of IPI-549. During the year, the company expects to make substantial progress with the Phase 1/1b clinical study of IPI-549, which is designed to evaluate IPI-549 both as a monotherapy and in combination with Opdivo. Infinity plans to report data from the monotherapy expansion and combination dose escalation components and initial data from the combination expansion component of the Phase 1/1b study of IPI-549 with Opdivo in the second quarter of 2018. In the second half of 2018, Infinity expects to report more mature clinical data from the combination expansion component of the study including translational insights from paired tumor biopsies across multiple diseases.

The company expects net loss for 2018 to range from $40 million to $50 million.