Stratification by “PI3K activation status” (“activated” denotes PIK3CA mutation, or PTEN loss, or both) in tumor biopsies yielded a 6‐month PFS rate of 50.00% (one‐sided CI 22.24‐100) in the “PI3K activated” subgroup (N = 10) and 18.18% (one‐sided CI 3.33‐100) in the “PI3K non‐activated” subgroup (PIK3CA wt and PTEN preserved) (N = 11). Here, PIK3CA is linked to neoplasm.