Below is a paragraph from an academic paper. Polish the writing to meet the academic style, improve the spelling, grammar, clarity, concision and overall readability. When necessary, rewrite the whole sentence.
 the high expression levels of lymphocyte marker in normal tissues and its loss of expression in tumoral cells may not only provide insight into the pathogenesis endocrine tumor but also inspire many other types or neuroendocrine tumor as it a common signature of many other endocrine cells.