These phase I/II trials were conducted in patients with advanced stages of lung cancers, and in most cases, retinoids were used in conjunction with various chemotherapies including: docetaxel and capecitabine, cisplatin, etoposide, vindesine, mitomycin-C, carboplatin, gemcitabine, vinorelbine, 5-fluorouracil, interferon, and interleukin-2. Here, IL2 is linked to lung cancer.