Most SCLCs supposed to be switched from a NSCLC have occurred in EGFR-mutated tumours [80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116] (Table 1, Table 2 and Table 3). Here, EGFR is linked to neoplasm.