Patrick Castillo Eustaquio

Dr. Patrick Castillo Eustaquio

orcid

Research Focus & Metrics

Academic Career Length

6Years (2021-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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Journal Article
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Louie Mar GangcuangcoLouie Mar Gangcuangco
Louie Mar Gangcuangco
PEPatrick Castillo Eustaquio
Patrick Castillo Eustaquio
In the past decade, the Philippines has gained notoriety as the country with the fastest-growing human immunodeficiency virus (HIV) epidemic in the Western Pacific region. While the overall trends of HIV incidence and acquired immunodeficiency syndrome (AIDS)-related deaths are declining globally, an increase in new cases was reported to the HIV/AIDS and ART Registry of the Philippines. From 2012 to 2023, there was a 411% increase in daily incidence. Late presentation in care remains a concern, with 29% of new confirmed HIV cases in January 2023 having clinical manifestations of advanced HIV disease at the time of diagnosis. Men having sex with men (MSM) are disproportionately affected. Various steps have been taken to address the HIV epidemic in the country. The Philippine HIV and AIDS Policy Act of 2018 (Republic Act 11166) expanded access to HIV testing and treatment. HIV testing now allows for the screening of minors 15–17 years old without parental consent. Community-based organizations have been instrumental in expanding HIV screening to include self-testing and community-based screening. The Philippines moved from centralized HIV diagnosis confirmation by Western blot to a decentralized rapid HIV diagnostic algorithm (rHIVda). Dolutegravir-based antiretroviral therapy is now the first line. Pre-exposure prophylaxis in the form of emtricitabine–tenofovir disoproxil fumarate has been rolled out. The number of treatment hubs and primary HIV care facilities continues to increase. Despite these efforts, barriers to ending the HIV epidemic remain, including continued stigma, limited harm reduction services for people who inject drugs, sociocultural factors, and political deterrents. HIV RNA quantification and drug resistance testing are not routinely performed due to associated costs. The high burden of tuberculosis and hepatitis B virus co-infection complicate HIV management. CRF_01AE is now the predominant subtype, which has been associated with poorer clinical outcomes and faster CD4 T-cell decline. The HIV epidemic in the Philippines requires a multisectoral approach and calls for sustained political commitment, community involvement, and continued collaboration among various stakeholders. In this article, we outline the current progress and challenges in curbing the HIV epidemic in the Philippines.

21 February 2022 in BMC Public Health
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Journal Article
Open access
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PEPatrick Castillo Eustaquio
Patrick Castillo Eustaquio
RFRoberto Figuracion
Roberto Figuracion
KIKiyohiko Izumi
Kiyohiko Izumi
MMMary Joy Morin
Mary Joy Morin
KSKenneth Samaco
Kenneth Samaco
MDMona Liza Diones
Mona Liza Diones
Introduction: The Philippines, which has the fastest rising HIV epidemic globally, has limited options for HIV testing and its uptake remains low among cisgender men who have sex with men (cis-MSM) and transgender women (TGW), especially amid the COVID-19 pandemic. As HIV self-testing (HIVST) and technology-based approaches could synergize to expand uptake of HIV testing, we aimed to evaluate the outcomes of a community-led online-based HIVST demonstration and to explore factors associated with HIVST-related behaviours and outcomes.Methods: We did a secondary data analysis among cis-MSM and TGW who participated in the HIVST demonstration, who were recruited online and tested out-of-facility, in Western Visayas, Philippines, from March to November 2020. We reviewed data on demographics, sexuality-, and context-related variables. Using multivariable logistic regression, we tested for associations between the aforementioned covariates and two primary outcomes, opting for directly-assisted HIVST (DAH) and willingness to secondarily distribute kits.Results: HIVST kits were distributed to 647 individuals (590 cis-MSM, 57 TGW), 54.6% were first-time testers, 10.4% opted DAH, and 46.1% were willing to distribute to peers. Reporting rate was high (99.3%) with 7.6% reactivity rate. While linkage to prevention (100%) and care (85.7%) were high, pre-exposure prophylaxis (PrEP) (0.3%) and antiretroviral therapy (ART) (51.0%) initiation were limited. There were no reports of adverse events. Those who were employed, had recent anal intercourse, opted for DAH, not willing to secondarily distribute, and accessed HIVST during minimal to no quarantine restriction had significantly higher reactivity rates. Likelihood of opting for DAH was higher among those who had three or more partners in the past year (aOR = 2.01 [CI = 1.01–4.35]) and those who accessed during maximal quarantine restrictions (aOR = 4.25 [CI = 2.46–7.43]). Odds of willingness to share were higher among those in urban areas (aOR = 1.64 [CI = 1.15–2.36]) but lower among first-time testers (aOR = 0.45 [CI = 0.32–0.62]).Conclusions: HIVST could effectively reach hard-to-reach populations. While there was demand in accessing online-based unassisted approaches, DAH should still be offered. Uptake of PrEP and same-day ART should be upscaled by decentralizing these services to community-based organizations. Differentiated service delivery is key to respond to preferences and values of key populations amid the dynamic geographical and sociocultural contexts they are in.

18 August 2023 in MMWR. Morbidity and Mortality Weekly Report
Verified
Journal Article
Open access
PEPatrick Castillo Eustaquio
Patrick Castillo Eustaquio
LSLaTweika A.T. Salmon-Trejo
LaTweika A.T. Salmon-Trejo
LMLisa C. McGuire
Lisa C. McGuire
SESascha R. Ellington
Sascha R. Ellington
This report describes age group-specific features of mpox among adults compared to features in adults over 50 years old by JYNNEOS vaccination status.


3 February 2021 in International Journal of STD & AIDS
Verified
Journal Article
Closed access
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PEPatrick Castillo Eustaquio
Patrick Castillo Eustaquio
SDSteffen S Docken
Steffen S Docken
KLKaterina T Leyritana
Katerina T Leyritana
LWLuh Putu Lila Wulandari
Luh Putu Lila Wulandari
The HIV epidemic in the Philippines is the fastest growing globally, and disproportionately affects cisgender men who have sex with men (cis-MSM) demanding effective strategies for this key population (KP) group. KP-specific and community-based (CB) interventions have improved the HIV response elsewhere, but these have yet to be evaluated locally. We analyzed the HIV care cascade outcomes in a KP-led, CB HIV test-and-treat center and determined factors that affect these by performing a retrospective study of medical records of 3137 patients diagnosed from January 2016 to March 2019 in LoveYourself in Manila, Philippines. Multivariate logistic regression was performed to determine predictors affecting the likelihood of antiretroviral therapy (ART) initiation and viral load (VL) suppression. As to UNAIDS 90–90–90 targets, LoveYourself had higher rates than national outcomes with 78% initiated ART and 84% achieved VL suppression. Such satisfactory performance is consistent with other studies exploring CB, KP-led approaches among cis-MSM. Patients who presented with WHO Stages 2–4 and those with sexually transmitted infections were less likely to initiate ART. Patients who presented with WHO Stages 2–4 and those whose ART was started late were less likely to be virally suppressed. These findings suggest the need to develop responsive interventions to reach the UNAIDS targets.

19 June 2025 in British Journal of Clinical Pharmacology
Verified
Journal Article
Open access
Andrej BelančićAndrej Belančić
Andrej Belančić
EGElvira Meni Maria Gkrinia
Elvira Meni Maria Gkrinia
PEPatrick Castillo Eustaquio
Patrick Castillo Eustaquio
AFAndrea Faour
Andrea Faour
Dinko VitezicDinko Vitezic
Dinko Vitezic
With multiple disease‐modifying therapies now available, treatment switching has become an important clinical consideration in the management of spinal muscular atrophy (SMA). While some switches are prompted by suboptimal clinical response, more commonly they are driven by treatment burden, convenience, or adverse events. This systematic literature review aimed to synthesize existing evidence on therapy switching in SMA, focusing on clinical effectiveness and practical implications to support evidence‐informed decision‐making in a rapidly evolving therapeutic landscape. The review followed PRISMA guidelines and was registered with PROSPERO (CRD42024600221). A systematic search of PubMed/MEDLINE, Global Health and Embase was conducted between 11 and 14 October 2024. Eligible studies included clinical trials and real‐world evidence (RWE) reports describing patients with genetically confirmed SMA who received nusinersen or risdiplam and subsequently switched to nusinersen, risdiplam or onasemnogene abeparvovec. Four studies met the inclusion criteria—three RWE studies and one clinical trial. The variability in measures of central tendency and variability among studies precluded the calculation of pooled summary values. Nonetheless, switching treatments was generally associated with stable motor function, with some improvements reported in selected outcome measures; ventilatory and nutritional support requirements remained largely unchanged. However, long‐term outcomes and standardized data were limited. Future research should prioritize robust RWE and post‐marketing surveillance to evaluate long‐term safety and effectiveness, incorporate standardized switching protocols, and account for SMA genotype–phenotype variation.