- Adequate sections and a paraffin block from the relapsed/refractory specimen must be submitted for review by the lymphoma pathology group; an adequate biopsy requires sufficient tissue to establish the architecture and a Revised European American Lymphoma (REAL) or World Health Organization (WHO) histologic subtype with certainty; thus, core biopsies, especially multiple core biopsies MAY be adequate; whereas, needle aspirations or cytologies are not adequate