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Angelopoulos V, Tsai E, Bingley L, Shaffer C, Turner DL, Runov A, Li W, Liu J, Artemyev AV, Zhang XJ, Strangeway RJ, Wirz RE, Shprits YY, Sergeev VA, Caron RP, Chung M, Cruce P, Greer W, Grimes E, Hector K, Lawson MJ, Leneman D, Masongsong EV, Russell CL, Wilkins C, Hinkley D, Blake JB, Adair N, Allen M, Anderson M, Arreola-Zamora M, Artinger J, Asher J, Branchevsky D, Capitelli MR, Castro R, Chao G, Chung N, Cliffe M, Colton K, Costello C, Depe D, Domae BW, Eldin S, Fitzgibbon L, Flemming A, Fox I, Frederick DM, Gilbert A, Gildemeister A, Gonzalez A, Hesford B, Jha S, Kang N, King J, Krieger R, Lian K, Mao J, McKinney E, Miller JP, Norris A, Nuesca M, Palla A, Park ESY, Pedersen CE, Qu Z, Rozario R, Rye E, Seaton R, Subramanian A, Sundin SR, Tan A, Turner W, Villegas AJ, Wasden M, Wing G, Wong C, Xie E, Yamamoto S, Yap R, Zarifian A, Zhang GY. The ELFIN Mission. Space Sci Rev 2020;216:103. [PMID: 32831412 PMCID: PMC7413588 DOI: 10.1007/s11214-020-00721-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 07/09/2020] [Indexed: 06/11/2023]

Abstract

The Electron Loss and Fields Investigation with a Spatio-Temporal Ambiguity-Resolving option (ELFIN-STAR, or heretoforth simply: ELFIN) mission comprises two identical 3-Unit (3U) CubeSats on a polar (∼93^∘ inclination), nearly circular, low-Earth (∼450 km altitude) orbit. Launched on September 15, 2018, ELFIN is expected to have a >2.5 year lifetime. Its primary science objective is to resolve the mechanism of storm-time relativistic electron precipitation, for which electromagnetic ion cyclotron (EMIC) waves are a prime candidate. From its ionospheric vantage point, ELFIN uses its unique pitch-angle-resolving capability to determine whether measured relativistic electron pitch-angle and energy spectra within the loss cone bear the characteristic signatures of scattering by EMIC waves or whether such scattering may be due to other processes. Pairing identical ELFIN satellites with slowly-variable along-track separation allows disambiguation of spatial and temporal evolution of the precipitation over minutes-to-tens-of-minutes timescales, faster than the orbit period of a single low-altitude satellite (T_orbit ∼ 90 min). Each satellite carries an energetic particle detector for electrons (EPDE) that measures 50 keV to 5 MeV electrons with Δ E/E < 40% and a fluxgate magnetometer (FGM) on a ∼72 cm boom that measures magnetic field waves (e.g., EMIC waves) in the range from DC to 5 Hz Nyquist (nominally) with <0.3 nT/sqrt(Hz) noise at 1 Hz. The spinning satellites (T_spin ∼ 3 s) are equipped with magnetorquers (air coils) that permit spin-up or -down and reorientation maneuvers. Using those, the spin axis is placed normal to the orbit plane (nominally), allowing full pitch-angle resolution twice per spin. An energetic particle detector for ions (EPDI) measures 250 keV - 5 MeV ions, addressing secondary science. Funded initially by CalSpace and the University Nanosat Program, ELFIN was selected for flight with joint support from NSF and NASA between 2014 and 2018 and launched by the ELaNa XVIII program on a Delta II rocket (with IceSatII as the primary). Mission operations are currently funded by NASA. Working under experienced UCLA mentors, with advice from The Aerospace Corporation and NASA personnel, more than 250 undergraduates have matured the ELFIN implementation strategy; developed the instruments, satellite, and ground systems and operate the two satellites. ELFIN's already high potential for cutting-edge science return is compounded by concurrent equatorial Heliophysics missions (THEMIS, Arase, Van Allen Probes, MMS) and ground stations. ELFIN's integrated data analysis approach, rapid dissemination strategies via the SPace Environment Data Analysis System (SPEDAS), and data coordination with the Heliophysics/Geospace System Observatory (H/GSO) optimize science yield, enabling the widest community benefits. Several storm-time events have already been captured and are presented herein to demonstrate ELFIN's data analysis methods and potential. These form the basis of on-going studies to resolve the primary mission science objective. Broad energy precipitation events, precipitation bands, and microbursts, clearly seen both at dawn and dusk, extend from tens of keV to >1 MeV. This broad energy range of precipitation indicates that multiple waves are providing scattering concurrently. Many observed events show significant backscattered fluxes, which in the past were hard to resolve by equatorial spacecraft or non-pitch-angle-resolving ionospheric missions. These observations suggest that the ionosphere plays a significant role in modifying magnetospheric electron fluxes and wave-particle interactions. Routine data captures starting in February 2020 and lasting for at least another year, approximately the remainder of the mission lifetime, are expected to provide a very rich dataset to address questions even beyond the primary mission science objective.

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Affiliation(s)

V Angelopoulos Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
E Tsai Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
L Bingley Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
C Shaffer Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Present Address: Tyvak Nano-Satellite Systems, Inc., Irvine, CA 92618 USA
D L Turner Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Present Address: Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723 USA
A Runov Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
W Li Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Present Address: Department of Astronomy and Center for Space Physics, Boston University, Boston, MA 02215 USA
J Liu Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
A V Artemyev Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
X-J Zhang Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
R J Strangeway Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
R E Wirz Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
Y Y Shprits Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA GFZ German Research Centre for Geosciences, Potsdam, 14473 Germany
V A Sergeev Saint Petersburg State University, St. Petersburg, 199034 Russia
R P Caron Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
M Chung Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Present Address: Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723 USA
P Cruce Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Present Address: Northrop Grumman Aerospace Systems, Redondo Beach, CA 90278 USA
W Greer Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
E Grimes Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
K Hector Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Present Address: Raytheon Space and Airborne Systems, El Segundo, CA 90245 USA
M J Lawson Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
D Leneman Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
E V Masongsong Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
C L Russell Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
C Wilkins Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
D Hinkley The Aerospace Corporation, El Segundo, CA 90245 USA
J B Blake The Aerospace Corporation, El Segundo, CA 90245 USA
N Adair Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Present Address: Millenium Space Systems, El Segundo, CA 90245 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
M Allen Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Present Address: Northrop Grumman Aerospace Systems, Redondo Beach, CA 90278 USA
M Anderson Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Present Address: Aptiv, Agoura Hills, CA 91301 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
M Arreola-Zamora Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
J Artinger Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Physics and Astronomy Department, University of California, Los Angeles, CA 90095 USA
J Asher Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Present Address: Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723 USA
D Branchevsky Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA The Aerospace Corporation, El Segundo, CA 90245 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
M R Capitelli Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Present Address: Millenium Space Systems, El Segundo, CA 90245 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
R Castro Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Present Address: Raytheon Space and Airborne Systems, El Segundo, CA 90245 USA
G Chao Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Present Address: The Boeing Company, Long Beach, CA 90808 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
N Chung Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Present Address: SF Motors, Santa Clara, CA 95054 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
M Cliffe Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Present Address: SpaceX, Hawthorne, CA 90250 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
K Colton Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Present Address: Planet Labs, Inc., San Francisco, CA 94107 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
C Costello Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Computer Science Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
D Depe Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Electrical and Computer Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
B W Domae Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Electrical and Computer Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
S Eldin Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Electrical and Computer Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
L Fitzgibbon Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Present Address: Tyvak Nano-Satellite Systems, Inc., Irvine, CA 92618 USA
A Flemming Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Present Address: Northrop Grumman Aerospace Systems, Redondo Beach, CA 90278 USA
I Fox Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
D M Frederick Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Present Address: Millenium Space Systems, El Segundo, CA 90245 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
A Gilbert Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Electrical and Computer Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
A Gildemeister Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Present Address: Northrop Grumman Aerospace Systems, Redondo Beach, CA 90278 USA
A Gonzalez Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Present Address: SpaceX, Hawthorne, CA 90250 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
B Hesford Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Present Address: Jet Propulsion Laboratory, Pasadena, CA 91109 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
S Jha Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Computer Science Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
N Kang Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Present Address: Millenium Space Systems, El Segundo, CA 90245 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
J King Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Computer Science Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
R Krieger Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Present Address: Mercedes-Benz Research and Development North America, Long Beach, CA 90810 USA
K Lian Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Present Address: Northrop Grumman Aerospace Systems, Redondo Beach, CA 90278 USA
J Mao Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Present Address: Verona, WI 53593 USA
E McKinney Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Present Address: California State Polytechnic University, Pomona, CA 91768 USA
J P Miller Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Computer Science Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
A Norris Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
M Nuesca Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Computer Science Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
A Palla Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Computer Science Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
E S Y Park Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Present Address: Economics Department, University of California, Los Angeles, CA 90095 USA
C E Pedersen Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
Z Qu Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
R Rozario Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Present Address: SpaceX, Hawthorne, CA 90250 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
E Rye Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Electrical and Computer Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
R Seaton Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
A Subramanian Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Present Address: Northrop Grumman Aerospace Systems, Redondo Beach, CA 90278 USA
S R Sundin Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Present Address: Tyvak Nano-Satellite Systems, Inc., Irvine, CA 92618 USA
A Tan Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Present Address: Experior Laboratories, Oxnard, CA 93033 USA
W Turner Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Physics and Astronomy Department, University of California, Los Angeles, CA 90095 USA
A J Villegas Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Physics and Astronomy Department, University of California, Los Angeles, CA 90095 USA
M Wasden Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
G Wing Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Computer Science Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
C Wong Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Physics and Astronomy Department, University of California, Los Angeles, CA 90095 USA
E Xie Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Electrical and Computer Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
S Yamamoto Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
R Yap Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Mathematics Department, University of California, Los Angeles, CA 90095 USA
A Zarifian Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Present Address: Jet Propulsion Laboratory, Pasadena, CA 91109 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
G Y Zhang Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA Present Address: Qualcomm, San Diego, CA 92121 USA

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Wilkins S, Yap R, Loon K, Staples M, Oliva K, Ruggiero B, McMurrick P, Carne P. Surgical outcome after standard abdominoperineal resection: A 15-year cohort study from a single cancer centre. Ann Med Surg (Lond) 2018;36:83-89. [PMID: 30425830 PMCID: PMC6224354 DOI: 10.1016/j.amsu.2018.10.029] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Revised: 10/23/2018] [Accepted: 10/24/2018] [Indexed: 12/13/2022] Open

Chew L, Si EH, Ng J, Yap R, Koo KN, Shih V, Poon D. Knowledge of prescription medications among elderly cancer patients. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.e19548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open

Chew L, Si E, Shih L, Yap R, Poon D. 4013 Knowledge of prescription medications among elderly cancer patients. EJC Suppl 2009. [DOI: 10.1016/s1359-6349(09)70747-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open

Poon D, Lee HH, Chan LL, Yap R, Koo WH. An exploratory analysis of comprehensive geriatric assessment results and overall survival in 233 consecutive elderly cancer patients. J Clin Oncol 2009. [DOI: 10.1200/jco.2009.27.15_suppl.9504] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open

Abstract 9504 Background: Performance status (PS) is the main clinical parameter used by most oncologists to assess the ability of elderly cancer patients to tolerate chemotherapy and estimate prognosis. The results of comprehensive geriatric assessment (CGA) for elderly cancer patients were analyzed to investigate the impact of each CGA functional, physical, cognitive, and affective domain on overall survival in relation to performance status. Methods: CGA was used for 233 consecutive elderly cancer patients aged 70 and above. CGA tools included the Katz index of daily activities independence (ADL), instrumental activities of daily living (IADL), mini-mental state examination (MMSE), geriatric depression scale (GDS), Charlson comorbidity risk index, get up and go test, and mini-nutritional assessment. Geriatric syndrome is defined as any high risk of falls, depression, dementia, increased functional dependence, or malnutrition. Eastern Cooperative Oncology Group (ECOG) scale was used to grade PS. Cancer type and stage were also analyzed. Log rank test was used to compare overall survival and hazard ratio (HR) derived using Cox regression method. Univariate and multivariate analyses were done to assess impact of ECOG status, presence of geriatric syndrome, stage of disease and cancer type on overall survival. Results: All 233 patients were included in the analysis, median age 77 (70 - 93), all had solid tumors and predominant tumors comprising 79% of diagnoses were colorectal, lung and breast, 50% had advanced metastatic disease. ECOG grades 2,3,4 (HR 0.28, 95% CI 0.14 - 0.55), dependent IADL status (HR 0.30, 95% CI 0.11 - 0.83), presence of geriatric syndrome (HR 0.42 95% CI 0.26 - 0.69), poor cognition (HR 0.53 95% CI 0.36 - 0.77), or advanced disease (HR 0.30 95% CI 0.14 - 0.65) was associated with inferior overall survival in univariate analysis. Only poor ECOG status, presence of a geriatric syndrome and advanced disease predicted adversely for overall survival in multivariate analysis. Poor cognition (MMSE score <24) in those with borderline ECOG 2 status was associated with poorer survival (HR 0.38 95% CI 0.33 - 0.90). Conclusions: Utility of CGA will improve the assessment of the elderly cancer patient. No significant financial relationships to disclose. Collapse

Quintero R, Yap R, Lopez M, Acacio B, Nouriani M. A Comparison of Microdose Flare Protocol Versus AACEP Protocol for IVF Poor Responders. Fertil Steril 2008. [DOI: 10.1016/j.fertnstert.2008.02.077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]

Nelius T, Klatte T, Reiher F, Filleur S, Yap R, Allhoff EP. Randomized study of docetaxel (D) and dexamethasone (DX) with low or high dose estramustine (E) for patients with advanced hormone-refractory prostate cancer (HRPC). J Clin Oncol 2006. [DOI: 10.1200/jco.2006.24.18_suppl.4653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open

Abstract 4653 Background: D-based chemotherapy is a burgeoning option for men with advanced HRPC. Alone or in combination with E, D has been shown to improve median survival. In this study we tested the combination of D with two different doses of E in patients (pts) with HRPC to improve response rates and to lower side effects. Methods: 72 metastatic HRPC pts were randomly assigned to receive D (70 mg/m2 IV, d2, q3w) and E (3 × 280 mg/d PO starting 1 day prior to D, for 5 consecutive days) for arm A or E (3 x 140 mg/d PO starting 1 day prior to D, for 3 consecutive days) for arm B. Premedication with oral DX at a total daily dose of 16 mg, in divided doses two times a day was administered in arm A on day 1 to 5 and in arm B on day 1 to 3. Initially, 6 cycles were administered and repeated after significant PSA rise. Pts were monitored for PSA response, time to progression (TTP), survival and toxicity. Results: PSA declines of ≥75%, ≥50% and ≤50% were 36.8%, 55.3% and 44.7% in arm A and 38.2%, 67.6% and 32.4% in arm B, respectively (P = .442). TTP in Arm A and Arm B were 11 months (95% CI, 7–14) versus 14 months (95% CI, 8–19), P = .6911) and overall survival 21 months (95% CI, 6–35) versus 22 months (95% CI, 18–27), respectively, (P = .4149). The primary treatment-related side effects observed in arm A and arm B were granulocytopenia (34% and 29%, P = .663) and thrombotic complications caused by E (four pts (11%) and one pt (3%), respectively, P = .206). Associated baseline factors with overall survival in univariate analysis were ECOG performance status (P < .001), hemoglobin level (P < .001), bone pain (P < .001), and PSA (P < .097) and in multivariate analysis ECOG performance status (95% CI, 2.9–13.9) and bone pain (95% CI, 3.2–20.1), (P < .001). Conclusions: In this randomized phase II study the combination of D and E had substantial activity in HRPC. We did not find a statistically significant difference of higher dose of E in combination with D compared to a lower dose of E and D regarding PSA response, TTP and survival. However, there was a tendency of higher toxicity in the high dose E group. These treatment-related toxicities were mainly hematologic and manageable. The results of this study support the assertion that estramustine is not necessary in docetaxel-based treatment regimens. No significant financial relationships to disclose. Collapse

Quesada AJ, Nelius T, Yap R, Zaichuk TA, Alfranca A, Filleur S, Volpert OV, Redondo JM. In vivo upregulation of CD95 and CD95L causes synergistic inhibition of angiogenesis by TSP1 peptide and metronomic doxorubicin treatment. Cell Death Differ 2005;12:649-58. [PMID: 15818399 DOI: 10.1038/sj.cdd.4401615] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open

Nelius T, Reiher F, Lindenmeir T, Burandt J, Rau O, Filleur S, Klatte T, Yap R, Allhoff EP. Docetaxel (D) plus estramustine monophosphate (EMP) in patients (pts) with hormone refractory prostate cancer (HRPC). J Clin Oncol 2005. [DOI: 10.1200/jco.2005.23.16_suppl.4780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open

Yap P, Pantangco E, Yap A, Yap R. Surgical management of gastric carcinoma. Follow-up results in 465 consecutive cases. Am J Surg 1982;143:284-7. [PMID: 7065345 DOI: 10.1016/0002-9610(82)90091-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]

Yap R, Madrazo B, Oh HK, Dienst SG. Perirenal fluid collection after renal transplant. Am Surg 1981;47:287-90. [PMID: 7020512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]