The present invention relates to novel sequences for use in detection, diagnosis and treatment of diseases, including cancer. The invention provides novel splice products of human DKKL-1 gene. The present invention provides methods of using polynucleotides having the novel splice products of the human DKKL-1 sequences, their corresponding gene products and modulators of the DKKL-1 splice products for the detection, diagnosis, prevention and/or treatment of associated cancers.