title: True histiocytic lymphoma following therapy for lymphoblastic neoplasms.
abstract: True histiocytic lymphomas (THLs) are rare tumors in which the malignant cells show morphologic and immunophenotypic evidence of histiocytic differentiation. We describe THLs that arose after therapy for one case of T-lineage lymphoblastic lymphoma (LyL) and two cases of acute lymphoblastic leukemia (ALL) (both CD10+, one pre-B phenotype). The lymphoblastic neoplasms were not unusual in any way, and responded well to standard therapy. The THLs arose 10 to 20 months after complete remission was achieved for the lymphoblastic neoplasms, at which time there was still no clinical or pathologic evidence of the lymphoblastic neoplasms. All three THLs exhibited clinical and morphologic features of malignancy. Neoplastic cells in the THLs had abundant eosinophilic vacuolated cytoplasm and pleomorphic nuclei, and expressed histiocytic antigens in the absence of lymphocyte-specific lineage markers. Because THLs are rare neoplasms, their occurrence after otherwise successful therapy for lymphoblastic neoplasms in these three cases may constitute a distinct clinicopathologic entity.
authors.affiliation: Department of Pathology, Stanford University Medical Center, Stanford, CA., USA.
authors.forename: R A
authors.initials: RA
authors.lastname: Soslow
authors.forename: R E
authors.initials: RE
authors.lastname: Davis
authors.forename: R A
authors.initials: RA
authors.lastname: Warnke
authors.forename: M L
authors.initials: ML
authors.lastname: Cleary
authors.forename: O W
authors.initials: OW
authors.lastname: Kamel
mesh_terms: D000328:Adult; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000009:adverse effects* / Q000627:therapeutic use; D001215:Asparaginase / Q000008:administration & dosage / Q000009:adverse effects; D001859:Bone Neoplasms / Q000139:chemically induced* / Q000188:drug therapy / Q000473:pathology; D002648:Child; D002945:Cisplatin / Q000008:administration & dosage; D003131:Combined Modality Therapy; D003520:Cyclophosphamide / Q000008:administration & dosage / Q000009:adverse effects; D003561:Cytarabine / Q000008:administration & dosage / Q000009:adverse effects; D003630:Daunorubicin / Q000008:administration & dosage / Q000009:adverse effects; D005047:Etoposide / Q000008:administration & dosage; D017809:Fatal Outcome; D006801:Humans; D007069:Ifosfamide / Q000008:administration & dosage; D016403:Lymphoma, Large B-Cell, Diffuse / Q000139:chemically induced* / Q000188:drug therapy / Q000473:pathology / Q000532:radiotherapy; D008297:Male; D008479:Mediastinal Neoplasms / Q000188:drug therapy; D015122:Mercaptopurine / Q000008:administration & dosage / Q000009:adverse effects; D008727:Methotrexate / Q000008:administration & dosage / Q000009:adverse effects; D008775:Methylprednisolone / Q000008:administration & dosage; D016609:Neoplasms, Second Primary / Q000139:chemically induced* / Q000188:drug therapy / Q000473:pathology / Q000532:radiotherapy; D014411:Neoplastic Stem Cells / Q000473:pathology; D015452:Precursor B-Cell Lymphoblastic Leukemia-Lymphoma / Q000188:drug therapy; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000188:drug therapy; D011239:Prednisolone / Q000008:administration & dosage / Q000009:adverse effects; D011241:Prednisone / Q000008:administration & dosage / Q000009:adverse effects; D012074:Remission Induction; D012540:Scapula / Q000473:pathology; D013125:Spinal Neoplasms / Q000139:chemically induced* / Q000188:drug therapy / Q000473:pathology; D014750:Vincristine / Q000008:administration & dosage / Q000009:adverse effects
chemical_list: D003561:Cytarabine; D014750:Vincristine; D005047:Etoposide; D003520:Cyclophosphamide; D011239:Prednisolone; D015122:Mercaptopurine; D001215:Asparaginase; D002945:Cisplatin; D007069:Ifosfamide; D011241:Prednisone; D008775:Methylprednisolone; D008727:Methotrexate; D003630:Daunorubicin