1.Isolated central nervous system relapse in blast crisis of chronic myeloid leukemia: a case report
Hari Priya RAGHVAN ; Caroline Ho Siew LING ; Wee Shiang YUI ; Boo Yang LIANG ; Ehram JAMIAN ; Indhira SUBBIAH
Journal of Yeungnam Medical Science 2025;42(1):17-
Chronic myeloid leukemia (CML) typically progresses from a chronic phase to an accelerated phase, and eventually to a blast crisis, often involving the bone marrow and peripheral blood, if left untreated. Central nervous system (CNS) involvement is an uncommon manifestation of CML, particularly as an isolated CNS relapse. Here, we present a rare case of CML in lymphoid blast crisis with an isolated CNS relapse. A 46-year-old female with underlying CML in lymphoid blast crisis, previously treated with chemotherapy and tyrosine kinase inhibitors, presented with visual disturbances. Imaging and cerebrospinal fluid analysis confirmed leukemic infiltration of the CNS without evidence of a systemic disease. Isolated CNS involvement is an atypical complication of CML and presents significant therapeutic challenges owing to the blood-brain barrier, which limits the efficacy of systemic therapies. Subsequently, the patient was treated with intrathecal chemotherapy targeting the CNS. Despite aggressive treatment, CNS relapse remains a major concern due to the limited penetration of standard therapies into the CNS. This case underscores the importance of early recognition of CNS symptoms in CML patients, particularly in those with blast crisis, and highlights the need for tailored therapeutic strategies to manage this rare and challenging manifestation.
2.Isolated central nervous system relapse in blast crisis of chronic myeloid leukemia: a case report
Hari Priya RAGHVAN ; Caroline Ho Siew LING ; Wee Shiang YUI ; Boo Yang LIANG ; Ehram JAMIAN ; Indhira SUBBIAH
Journal of Yeungnam Medical Science 2025;42(1):17-
Chronic myeloid leukemia (CML) typically progresses from a chronic phase to an accelerated phase, and eventually to a blast crisis, often involving the bone marrow and peripheral blood, if left untreated. Central nervous system (CNS) involvement is an uncommon manifestation of CML, particularly as an isolated CNS relapse. Here, we present a rare case of CML in lymphoid blast crisis with an isolated CNS relapse. A 46-year-old female with underlying CML in lymphoid blast crisis, previously treated with chemotherapy and tyrosine kinase inhibitors, presented with visual disturbances. Imaging and cerebrospinal fluid analysis confirmed leukemic infiltration of the CNS without evidence of a systemic disease. Isolated CNS involvement is an atypical complication of CML and presents significant therapeutic challenges owing to the blood-brain barrier, which limits the efficacy of systemic therapies. Subsequently, the patient was treated with intrathecal chemotherapy targeting the CNS. Despite aggressive treatment, CNS relapse remains a major concern due to the limited penetration of standard therapies into the CNS. This case underscores the importance of early recognition of CNS symptoms in CML patients, particularly in those with blast crisis, and highlights the need for tailored therapeutic strategies to manage this rare and challenging manifestation.
3.Isolated central nervous system relapse in blast crisis of chronic myeloid leukemia: a case report
Hari Priya RAGHVAN ; Caroline Ho Siew LING ; Wee Shiang YUI ; Boo Yang LIANG ; Ehram JAMIAN ; Indhira SUBBIAH
Journal of Yeungnam Medical Science 2025;42(1):17-
Chronic myeloid leukemia (CML) typically progresses from a chronic phase to an accelerated phase, and eventually to a blast crisis, often involving the bone marrow and peripheral blood, if left untreated. Central nervous system (CNS) involvement is an uncommon manifestation of CML, particularly as an isolated CNS relapse. Here, we present a rare case of CML in lymphoid blast crisis with an isolated CNS relapse. A 46-year-old female with underlying CML in lymphoid blast crisis, previously treated with chemotherapy and tyrosine kinase inhibitors, presented with visual disturbances. Imaging and cerebrospinal fluid analysis confirmed leukemic infiltration of the CNS without evidence of a systemic disease. Isolated CNS involvement is an atypical complication of CML and presents significant therapeutic challenges owing to the blood-brain barrier, which limits the efficacy of systemic therapies. Subsequently, the patient was treated with intrathecal chemotherapy targeting the CNS. Despite aggressive treatment, CNS relapse remains a major concern due to the limited penetration of standard therapies into the CNS. This case underscores the importance of early recognition of CNS symptoms in CML patients, particularly in those with blast crisis, and highlights the need for tailored therapeutic strategies to manage this rare and challenging manifestation.
4.Isolated central nervous system relapse in blast crisis of chronic myeloid leukemia: a case report
Hari Priya RAGHVAN ; Caroline Ho Siew LING ; Wee Shiang YUI ; Boo Yang LIANG ; Ehram JAMIAN ; Indhira SUBBIAH
Journal of Yeungnam Medical Science 2025;42(1):17-
Chronic myeloid leukemia (CML) typically progresses from a chronic phase to an accelerated phase, and eventually to a blast crisis, often involving the bone marrow and peripheral blood, if left untreated. Central nervous system (CNS) involvement is an uncommon manifestation of CML, particularly as an isolated CNS relapse. Here, we present a rare case of CML in lymphoid blast crisis with an isolated CNS relapse. A 46-year-old female with underlying CML in lymphoid blast crisis, previously treated with chemotherapy and tyrosine kinase inhibitors, presented with visual disturbances. Imaging and cerebrospinal fluid analysis confirmed leukemic infiltration of the CNS without evidence of a systemic disease. Isolated CNS involvement is an atypical complication of CML and presents significant therapeutic challenges owing to the blood-brain barrier, which limits the efficacy of systemic therapies. Subsequently, the patient was treated with intrathecal chemotherapy targeting the CNS. Despite aggressive treatment, CNS relapse remains a major concern due to the limited penetration of standard therapies into the CNS. This case underscores the importance of early recognition of CNS symptoms in CML patients, particularly in those with blast crisis, and highlights the need for tailored therapeutic strategies to manage this rare and challenging manifestation.
5.Insights into Treatment‑Free Remission (TFR) outcomes in Chronic Myeloid Leukaemia (CML) – a tertiary centre experience in Malaysia
Christopher Chin Keong LIAM ; Yang Liang BOO ; Li Min LIM ; Siew Lian CHONG ; Azizan SHARIF ; Yih Seong WONG ; Veena SELVARATNAM ; Sen Mui TAN ; Soo Min LIM
Blood Research 2025;60():64-
Purpose:
Tyrosine kinase inhibitors (TKIs) have improved the prognosis of chronic myeloid leukaemia (CML), allowing patients with favourable disease profiles and molecular responses to attempt treatment-free remission (TFR). We aim to establish the relapse-free survival (RFS) outcomes and identify prognostic factors for successful remission maintenance among those who attempt TFR.
Methods:
Adult CML patients who had undergone TFR from January 1, 2016, to June 30, 2024, were included. Upon TKI discontinuation, real-time quantitative polymerase chain reaction (RQ-PCR) was monitored monthly for the first 12 months, then every 3 months, with TKI reinitiated upon a transcript level above 0.1% (IS). Data analysis was performed using SPSS version 29.0 (SPSS Inc., Chicago, IL, USA).
Results:
Fifty-seven patients (27 males and 30 females) with a median age of 46 years (range 16 – 70) were analysed.The majority had a low EUTOS long-term survival (ELTS) score (61.4%, n = 35) and received imatinib (87.7%, n = 50).The median treatment duration was 8.8 years (range 4.2 – 18.8), and the median duration for sustained deep molecular remission (DMR) was 4.6 years (range 2.1 – 11.1). RFS was 70.2% at 6 months, 62.5% at 12 months and 56.8% at 2 years after a median follow-up of 34 months (range 9 – 101). The MR5 level was identified as an independent factor associated with sustained remission. All relapsed patients achieved DMR upon treatment reinitiation.
Conclusion
Treatment discontinuation can be safely performed, with many achieving long-term treatment-free remission. A deeper molecular response (MR5) is associated with an improved likelihood of remission maintenance.
8.Haemophilia care and outcome in a major haemophilia treatment centre in Malaysia
Yang Liang Boo ; Christopher Chin Keong Liam ; Kar Ying Yong ; Rui Jeat Fann ; Grace Wan Chieng Lee ; Gilbert Wilfred ; Jameela Sathar
The Medical Journal of Malaysia 2021;76(1):46-50
Introduction/Objective: The management of potential
treatment-related complications and bleeding events in
haemophilia is challenging in developing countries.
Providing optimal care among these patients improve their
quality of life (QOL) and life expectancy. This study explores
the demographic characteristics and treatment outcome in a
major haemophilia treatment centre in Malaysia.
Materials and Methods: A total of 260 patients were recruited
in this retrospective cross-sectional analysis. Clinical data,
including treatment regimens and outcome, were collected
and analysed.
Results: A total of 211 patients were diagnosed with
haemophilia A (HA) (severe disease, 72.5%) and 49 patients
had haemophilia B (HB) (severe disease, 65.3%). The median
age was 31 (IQR;2-84) years. Majority of the patients had at
least one episode of musculoskeletal bleeding since
diagnosis. The mean annual bleeding event (ABE) was 4.91
(SD±6.07) in 2018. Target joints were identified in 80.4% of
the patients. Chronic arthropathy and synovitis collectively
accounted for more than half of the musculoskeletal
complications. 30.1% of the patients had contracted
hepatitis C with less than half received treatment. Thirty-one
patients (16.8%) with severe haemophilia developed
inhibitor and 12 patients successfully underwent immune
tolerance induction. More than three-quarters of the severe
haemophilia patients were treated with factor concentrate
prophylaxis. The mean prophylaxis dose for HA and HB were
41.3 (SD±19.1) and 48.6 (SD±21.5) IU/kg/week, respectively.
In patients with severe disease, prophylaxis significantly
reduced the ABE (5.45,9.03;p=0.005).
Conclusion: The importance of utilising a low to moderate
dose regimen as prophylaxis in haemophilic patients is
highlighted in our study. Future studies should include QOL
assessment will further improve the management in
haemophilia.
9.Persistent thrombocytopenia following dengue fever: What should we do?
Yang Liang Boo ; Suat Yee Lim ; Hon Shen P&rsquo ; ng ; Christopher Chin Keong Liam ; Nai Chien Huan
Malaysian Family Physician 2019;14(3):71-73
Thrombocytopenia is a common laboratory finding in dengue infection. However, it usually
resolves as the patient recovers from the infection. Persistent thrombocytopenia following dengue
infection requires further investigation. Here, we present a case of immune thrombocytopenic
purpura (ITP) following dengue infection complicated by intracranial bleeding.
10.Appropriateness of deep vein thrombosis (DVT) prophylaxis use among medical inpatients: a DVT risk alert tool (DRAT) study
Diana Fui Sing Yap ; Zhi Yung Ng ; Chier Yit Wong ; Muhamad Saifuzzaman Muhamad Kassim ; Yang Liang Boo
The Medical Journal of Malaysia 2019;74(1):45-50
Increasing incidence of Venous
Thromboembolism (VTE) has complicated treatment
courses for hospitalised patients. Despite recommendation
to support deep vein thrombosis (DVT) risk assessment and
appropriate use of prophylaxis in medical inpatients, it is
either neglected or prescribed unnecessarily by the
clinicians. This study aimed to assess and compare the
appropriateness of DVT prophylaxis prescribing between
usual care versus a pharmacist-driven DVT Risk Alert Tool
(DRAT) intervention among hospitalised medical patients.


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