The immunohistochemical studies demonstrated that the majority of tumor cells were immunoreactive for neuroendocrine markers that included chromogranin A, synaptophysin and neuronspecific enolase.

黏液性神经内分泌癌的鑑别诊断包括黏液性腺癌，侵袭性腺管癌，侵袭性小叶癌及转移性神经内分泌癌。