Purpose: Preclinical data suggest that combining the mTOR/hypoxia-inducible factor (HIF) inhibitor temsirolimus and the antiangiogenesis antibody bevacizumab may augment antitumor activity as well as resensitize cells to anthracyclines.Experimental Design: We initiated a phase I study of bevacizumab and temsirolimus plus liposomal doxorubicin in patients with advanced malignancies. Patients (N ¼ 136) were enrolled according to a modified 3 þ 3 design plus dose expansion in responsive tumor types.Results: The most common cancers were breast (n ¼ 29), epithelial ovarian (n ¼ 23), and colorectal cancer (n ¼ 17). The median number of prior chemotherapy regimens was four (range: 0-16). Grade 3 or higher adverse events (> 5%) included pancytopenia, mucositis, hand-foot syndrome, hypertension, and fistula. This regimen led to a 21% (n ¼ 28) stable disease (SD) ! 6 months and 21% (n ¼ 29) rate of partial or complete remission [PR/CR; (total SD ! 6 months/PR/CR ¼ 42% (n ¼ 57)]. PR/CR was most common in parotid gland adenocarcinoma (4/6, 67%), metaplastic breast cancer (5/12, 42%), endometrial endometrioid carcinoma (6/15, 40%), and in patients with a PIK3CA mutation and/or a PTEN mutation/loss (11/28, 39%). The maximum tolerated dose was liposomal doxorubicin 30 mg/m 2 and bevacizumab 15 mg/kg every three weeks with temsirolimus 25 mg weekly. Conclusions: Patients tolerated bevacizumab and temsirolimus together with liposomal doxorubicin. Further evaluation, especially in patients with parotid, metaplastic breast, and endometrial endometrioid cancer, and in patients with PIK3CA and/or PTEN aberrations is warranted.