Abstract: Methods of administering Compound A, or pharmaceutically acceptable salt thereof, for the treatment of solid tumors having one or more genetic alterations in FGFR1, FGFR2 and/or FGFR3 are provided.

Abstract: A method of selecting a subject suffering from a cancer for a therapeutic regimen of administration of a pharmaceutical composition comprising an effective amount of an FGFR inhibitor is described, which method comprises (1) the taking of a tumor or liquid biopsy from the subject; (2) determination of the level of expression of any or all of FGFR1, FGFR2 and FGFR3, and (3) comparison of the determined level of expression of at least one of FGFR1, FGFR2 and FGFR3 with a pre-established threshold value, and declaring the subject eligible for the therapeutic regimen if the determined level exceeds the threshold value. The invention also relates to a method of personalized cancer therapy comprising selection of a subject by the above-described method and subjecting the subject to a therapeutic regimen that comprises administration of a pharmaceutical composition comprising an effective amount of an FGFR inhibitor.