Regarding tumor tissue‐based subgroups, the 6‐month PFS rate was highest (62.5%; one‐sided CI 28.92‐100) in the PIK3CA‐mutated subgroup (N = 8) and lowest (0%; one‐sided CI 0.0‐100) in the PTEN loss subgroup (N = 2). Here, PTEN is linked to neoplasm.