The mRNA level of CaMKK2 was higher in patients with SCLC and LUAD versus adjacent normal tissues (Figure S5A–C, Supporting Information); in CSCs isolated from several lung cancer cell lines (e.g., A549, H460, H1299, and H1793) versus non‐CSCs (Figure S5D, Supporting Information); and in CSCs freshly isolated from tissues of patients with lung cancer versus non‐CSCs (Figure S5E, Supporting Information). Here, CAMKK2 is linked to small cell lung carcinoma.