The purpose of this study is to evaluate the safety, tolerability, immune response and clinical efficacies of HLA-A*2402 restricted epitope peptides CDCA1 and KIF20A emulsified with Montanide ISA 51 for advanced small cell lung cancers.

The investigators previously identified three novel HLA-A*2402-restricted epitope peptides, which were derived from two cancer-testis antigens, CDCA1 and KIF20A, as targets for cancer vaccination against lung cancer. In this phase I trial, the investigators examine using a combination of these two peptides the safety, immunogenicity, and antitumor effect of vaccine treatment for HLA-A*2402-positive advanced small cell lung cancer patients who failed to standard therapy.

Inclusion Criteria:

1. SCLC that can not undergo curative surgery and treatment, and is refractory to standard chemotherapy and radiotherapy
2. ECOG performance status 0-2
3. Age between 20 to 85
4. Clinical efficacy can be evaluated by some methods
5. No prior chemotherapy, radiation therapy, hyperthermia or immunotherapy within 4 weeks
6. Life expectancy > 3 months
7. Laboratory values as follows 1500/mm3 < WBC < 15000/mm3 Platelet count > 75000/mm3 Asparate transaminase < 3 X cutoff value Alanine transaminase < 3 X cutoff value Total bilirubin < 3 X cutoff value Serum creatinine < 2X cutoff value
8. HLA-A*2402
9. Able and willing to give valid written informed consent

Exclusion Criteria:

1. Active and uncontrolled cardiac disease (i.e. coronary syndromes, arrhythmia)
2. Myocardial infarction within six months before entry
3. Breastfeeding and Pregnancy (woman of child bearing potential)
4. Active and uncontrolled infectious disease
5. Concurrent treatment with steroids or immunosuppressing agent
6. Other malignancy requiring treatment
7. Non-cured traumatic wound
8. Decision of unsuitableness by principal investigator or physician-in-charge