PPIC and breast cancer: 10 of the 12 hMAM positive blood samples (83%) were also positive when analyzed using the six gene panel, and 52% of the recurrent breast cancer blood samples were solely identified by CCNE2, DKFZp762E1312, EMP2, MAL2, PPIC, or SLC6A8. Similarly, the six gene panel identified all of the EpCAM positive blood samples.