There is described herein methods for improving tumor infiltrating lymphocyte (TIL) therapy by limiting the effect of innate lymphoid cells (ILCs) thereon. For example, in an aspect, there is provided a method of treating cancer in a patient in need thereof, comprising inhibiting the suppressive effect of CD56+CD3- innate lymphoid cells (ILCs) on tumor infiltrating lymphocyte (TIL) propagation or expansion.