- Case study
- Open Access
A case of post-transplant adult T-cell leukemia/lymphoma presenting myelopathy similar to but distinct from human T-cell leukemia virus type I (HTLV- I)-associated myelopathy
© Kawamata et al.; licensee Springer. 2014
Received: 15 August 2014
Accepted: 22 September 2014
Published: 4 October 2014
Adult T-cell leukemia/lymphoma (ATL) responds poorly to conventional chemotherapy, but allogeneic stem cell transplantation (allo-SCT) may improve disease prognosis. Herein, we report a female patient with human T-cell leukemia virus type I (HTLV-I)-associated myelopathy (HAM)-like myelopathy following allo-SCT for ATL.
She developed crural paresis 14 months after allo-SCT. Initially, she was diagnosed with central nervous system (CNS) relapse of ATL and treated with intrathecal injection and whole brain and spine irradiation. Her symptoms recurred 5 months later, when a cerebrospinal fluid (CSF) specimen showed increased CD4 + CXCR3 + CCR4+ cell numbers and levels of neopterin and CXCL10 (IP-10).
These results suggest the possible involvement of a certain immunological mechanism such as HAM in her symptoms, irrespective of the lack of anti-HTLV-I antibody in her CSF. Because a definitive diagnosis of CNS manifestation of ATL is sometimes difficult, multi-modal laboratory data are required for differential diagnosis.
Human T-cell leukemia virus type I (HTLV-I) was the first retrovirus identified in humans, isolated from a patient with cutaneous lymphoma (Poiesz et al.1980). HTLV-I is the cause of not only adult T-cell leukemia/lymphoma (ATL) (Uchiyama et al.1977; Hinuma et al.1981) but also HTLV-I-associated myelopathy (HAM)/tropical spastic paraparesis (TSP) (Osame et al.1986), HTLV-I-associated uveitis (HU) (Ohba et al.1989; Mochizuki et al.1992) and infective dermatitis (McGill et al.2012; de Oliveira et al.2010).
ATL is one of the most intractable T-cell malignancies, and it responds poorly to conventional chemotherapy, with a median survival time (MST) of approximately 8 months (Shimoyama et al.1988). Among such treatments, modified LSG-15 (mLSG-15) has shown the best results; in a previous study, the progression free survival (PFS) at 1 year among patients treated with mLSG-15 was 28% and the overall survival (OS) at 3 years was 24% (Tsukasaki et al.2007). However, the improvement in survival time by mLSG-15 treatment is not satisfactory. Allo-HSCT is a promising treatment option to cure ATL because it may improve disease prognosis (Utsunomiya et al.2001; Kami et al.2003).
Herein, we describe a case of HAM-like myelopathy that was difficult to distinguish from central nervous system (CNS) relapse of ATL following allogeneic peripheral blood stem cell transplantation. This case report suggests that there might be immunological myelopathy after HSCT. In the present case, flow cytometric analysis of the cells in cerebrospinal fluid (CSF) was helpful to differentiate it from CNS relapse of ATL.
Laboratory data of onset of ATL (lymphoma type) in October 2010
423 × 104/μl
21.9 × 104/μl
She was referred to our hospital and received four sessions of mLSG-15 therapy in our hospital. Prophylactic intrathecal injection was performed twice, during chemotherapy and before allogeneic stem cell transplantation. No meningeal involvement of ATL cells was detected at that time. She went into complete remission (Response criteria for adult T cell leukemia-lymphoma from an international consensus meeting (Tsukasaki et al.2009)) in April 2011. She received following allogeneic peripheral blood stem cell transplantation (allo-PBSCT) in the National Cancer Center Hospital (Tokyo, Japan) (Figure 1). The transplantation conditioning regimen consisted of fludarabine (30 mg/m2 per day for 5 days) plus busulfan (3.2 mg/kg per day for 2 days) and only cyclosporine A (CyA) was used for GVHD prophylaxis. Transplanted CD34-positive cells were 2.67 × 106/kg and rapid engraftment was achieved. Grade III (gastrointestinal tract and skin) acute graft-versus-host disease (GVHD) was observed 1 month after transplantation, but it improved after treatment with methylpredonisolone (mPSL) (1 mg/kg). No chronic GVHD was observed. CyA was tapered gradually and discontinued 9 months after transplantation, in February 2012. After that point, only 5 mg/day predonisolone (PSL) was continued.
Bacterial, fungal, and tuberculous encephalomyelopathies were excluded because no increase in cell numbers and no decline in glucose concentration in CSF were observed. Real-time polymerase chain reaction (PCR) testing for CMV, EBV, HSV, VZV, HHV-6, and JC virus in CSF showed negative results.
Laboratory data on admission to our hospital in January 2013
302 × 104/μl
12.0 × 104/μl
Not all of the results necessarily corresponded to CNS relapse of ATL, although we could not exclude it. We treated her with mPSL pulse and intrathecal injection of MTX + Ara-C + PSL. After one course of mPSL pulse, her crural paresis improved dramatically to such a degree that she could pull up to standing after a few days. Although she was given intrathecal injections four times weekly, her crural paresis was gradually exacerbated and progressed to paralysis. mPSL pulse was performed again, but the effect was limited.
We examined her CSF again but there was no increase in cells, and ATL cells could not be detected by microscopic examination. Furthermore, the MRI findings improved over time (Figure 2C), although her neurological findings worsened and HTLV-I proviral DNA could not be detected repeatedly in peripheral mononuclear cells (PBMCs) after allo-PBSCT. No evidence of relapsed ATL could be found and we continued 5 mg/day PSL thereafter while she continued rehabilitation.
The results of CSF analysis in May 2013 showed the following improvements. In flow cytometric analysis, the CD4 + CXCR3 + CCR4+ cell population had decreased and the normal CD4 + CXCR3 + CCR4- cell population had increased. Both neopterin and CXCL10 (IP-10) had decreased to within the range of the therapeutic goal for HAM patients (Figure 4A,B). Her paralysis improved gradually and steadily only by rehabilitation, to such a degree that she could walk when holding onto parallel bars.
ATL with CNS involvement may occur during systemic progression of the disease and its frequency is estimated to be 10–25% (Kitajima et al.2002). However, cases of CNS relapse without peripheral blood and lymph nodes of ATL have been reported (Marshall et al.1998; Dungerwalla et al.2005). In flow cytometric analysis of CSF of ATL patients, the CD4 + CXCR3-CCR4+ cell population is elevated. However, in the current case, the CSF fluid analysis revealed expansion of the CD4 + CXCR3 + CCR4+ cell population, which is consistent with HAM (Natsumi et al.2014). Sato T et al. (Sato et al.2013) reported increased neopterin and CXCL10 (IP-10) in HAM patients, and they were valuable biomarkers for disease progression of HAM. The neopterin and CXCL10 (IP-10) concentration in CSF paralleled the disease activity of HAM. The cut-off concentrations of neopterin and CXCL10 in HAM/TSP patients compared to HTLV-I infected non-HAM subjects are less than 5 pmol/mL and 200 pg/ml, respectively, and the CXCL10 (IP-10) concentration in the CSF of HAM patients with rapid progression is usually more than 5,000 pg/mL (Yamono, Y., personal communication). In the current case, we could not make a diagnosis of HAM because the CSF was negative for HTLV-I antibody in repeated examinations. Although the immunosuppressive status after allo-PBSCT might contribute, serum immunoglobulin levels were almost within normal limit at the same time period (Table 2) and there is not enough evidence to indicate false negative. In any inflammatory diseases of CNS, CXCR3+ cells but not CCR4+ cells were generally found in CSF(Misu et al.2001). However, CXCR3 + CCR4+ double positive cells existed in her CSF. It was unlikely that CXCR3 + CCR4+ double positive cells emerged into CSF in nonspecific inflammatory condition. Given her background, we supposed these CCR4+ cells were HTLV-I infected cells, but the number of these cells was insufficient to measure HTLV-I viral load.
In the current case, neither CSF data nor clinical course consisted with CNS relapse of ATL. In case of ATL patients, CXCR3-CCR4+ T cell lymphocytes population expanded. Therapeutic effect was obtained from mPSL pulse rather than intrathecal injection. Furthermore, disease progression in the typical case of CNS relapse of ATL was more aggressive. We concluded some inflammatory condition caused by these HTLV-I infected cells may have developed HAM-like myelopathy.
CNS GVHD remains a controversial entity and it is difficult to establish an unequivocal diagnosis. Yet a few cases have been reported, who were suspected of CNS GVHD from brain biopsy or autopsy, their CSF showed predominant T-lymphocyte infiltration of donor origin (Kamble et al.2007). In the current case, brain or spinal cord biopsy was not performed, and chimerism analysis of T cells in CSF was difficult because of the full-match HLA and sex-matched PBSCT. The number of T cells in CSF was insufficient to analyze chimerism using the short tandem repeat (STR) method. Neopterin (Niederwieser et al.1984; Hempel et al.1997) and CXCL10 (IP-10) (Mapara et al.2006) levels in serum increase significantly in patients with active GHVD, but the levels in CSF are unknown. The possibility of active CNS GVHD could not be completely excluded. Both CXCR3 and CCR4 expression of T cells infiltrated in the CNS in patients with active CNS GVHD is unknown. It was no wander that CXCR3+ cells in CSF were found in nonspecific inflammatory condition such as CNS GVHD, but unlikely that CCR4+ cells were.
The patient’s neurological dysfunction seemed to fluctuate in parallel with the serum concentration of soluble interleukin-2 (sIL-2R) receptor (Figure 3). However, increased sIL-2R occurs not only with ATL relapse but also with HAM (Matsumoto et al.1990), GVHD (Kami et al.2000), and inflammatory neurogenic disorders caused by immunologic T-cell responses (Maier et al.2009). Thus, it is difficult to make a definite diagnosis based on elevated sIL-2R alone.
In conclusion, we report a case with myelopathy without ATL relapse in the CNS. Flow cytometric analysis is helpful to differentiate immune-mediated encephalopathy or myelopathy from CNS relapse of ATL. If we encountered the patients suspected of CNS relapse of ATL, we should consider the possibility of inflammatory condition caused by HTLV-I infected cells. Further analysis of pathology are warranted.
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