This is a phase 1, open-label, uncontrolled, multicenter study in 3 distinct solid tumors. The study design is dose-escalation/de-escalation using a standard 3 + 3 design to evaluate the safety profile of ADXS-NEO, to select a recommended phase 2 dose (RP2D), and identify initial signs of clinical activity in each of the 3 tumor-specific cohorts.