PIK3CB and neoplasm: When comparing clonal T‐cell expansion and Gini index (measure for the inequality of TCR distribution) across treatment conditions, we found these to be significantly higher post‐ versus pretreatment in the PI3K/mTORi‐ and PI3K/mTORi+PD‐1i treatment conditions, while no significant expansion was observed in PD‐1i‐ or vehicle‐treated tumours (Figure S4B).