Disclosed herein are methods of increasing sensitivity of a cancer cell to alternating electric fields comprising exposing the cancer cell to an alternating electric field for a period of time, the alternating electric field having a frequency and field strength, and exposing the cancer cell to an IGFR1 inhibitor, JNK inhibitor, RPS6 inhibitor or ERK inhibitor. Disclosed are methods of increasing treatment efficacy comprising applying an alternating electric field to a target site of the subject for a period of time, the alternating electric field having a frequency and field strength, wherein the target site comprises one or more cancer cells, and administering a therapeutically effective amount of one or more of an IGF1R inhibitor, JNK inhibitor, RPS6 inhibitor, and/or ERK inhibitor to the subject. Disclosed are methods of treating a subject having cancer comprising applying an alternating electric field to a target site of the subject for a period of time, the alternating electric field having a frequency and field strength, wherein the target site comprises one or more cancer cells, and administering a therapeutically effective amount of one or more of an IGF1R inhibitor, JNK inhibitor, RPS6 inhibitor, and/or ERK inhibitor to the subject. Disclosed are methods of reducing viability of cancer cells using an alternating electric field for a period of time, the alternating electric field having a frequency and field strength in combination with either an IGF1R inhibitor, JNK inhibitor, RPS6 inhibitor, and/or ERK inhibitor. Disclosed are methods of increasing apoptosis of a cancer cell comprising exposing the cancer cell to an alternating electric field for a period of time, the alternating electric field having a frequency and field strength; and exposing the cancer cell to an IGFR1 inhibitor, JNK inhibitor, RPS6 inhibitor or ERK inhibitor.