Provided herein are methods to reduce or slow down cell growth, for example in a cancer cell comprising contacting a cell with an effective amount of a combination of inhibitory RNA molecules targeting hnRNPA1, hnRNPA2 and PTB. Provided are methods to identify agents which reduce the levels of hnRNPA1, hnRNPA2 or PTB. Provided are methods to identify agents which increase ratio of PKM1/PKM2 proteins, or reduce PKM2 levels, or increase PKM1 levels.