The study design is to include 90 subjects. All subjects are treated with the common chemotherapy treatment. 50 percent will be treated with Iscador as combination with their common chemotherapy regimen. Common chemotherapy regimen used for NSCLC: Carboplatin and Gemcitabine. All study participants will receive this same chemotherapy regimen. This chemotherapy treatment is given every 3 weeks for up to 6 treatment cycles. The first day of the first treatment cycle, the combination of both Carboplatin and Gemcitabine will be administered. After a week (day 8 of treatment cycle) only Gemcitabine will be administered. Drugs would be calculated according to patient's body mass, renal function and general appearance. Once the patient signed Informed Consent he is assigned randomly to be treated with/without the injections of Mistletoe (called "Iscador"). Patient will receive the study medication (Iscador) as an intravenous injection that can be self injected or injected by any other of the family. Injections would be administered with low dose at the first week of the first treatment cycle and then, dose would be escalated, so as to check high sensitivity to the drug. Dosage would include: 2 injections of 0.1 mg, 2 injections of 0.1 mg and 2 injections of 1 mg. After that, treatment would continue with dosage of 10 g once every 2 days.