Expertise in
20
conditions

Dr. John O. Mascarenhas

Oncology
The Ruttenberg Treatment Center
1470 Madison Ave Fl 3, 
New York, NY 
Accepting New Patients
23 Years of Experience
Expertise in
20
conditions
The Ruttenberg Treatment Center
1470 Madison Ave Fl 3, 
New York, NY 

Overview

John Mascarenhas is an Oncologist practicing medicine in New York, New York. He has been practicing medicine for over 23 years.

Dr. Mascarenhas is highly rated in 20 conditions, according to our data. His clinical expertise encompasses Myeloproliferative Neoplasms (MPN), Thrombocytopenia, Acute Myeloid Leukemia (AML), Bone Marrow Aspiration, and Splenectomy.

He is actively involved in clinical research, co-authoring 300 peer reviewed articles and participating in 12 clinical trials. Dr. Mascarenhas is currently accepting new patients.

Specialties

Oncology

Licenses

Internal Medicine in NY

Hospital Affiliations

Mount Sinai Beth Israel
Mount Sinai Hospital
Mount Sinai South Nassau

Languages Spoken

English

Gender

Male

Insurance

Accepted insurance can change. Please verify directly with the provider.

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Accepted insurance plans:

Aetna
  • EPO
  • HMO
  • POS
  • PPO
Anthem BCBS
  • EPO
  • HMO
  • POS
  • PPO
Blue Cross Blue Shield
  • EPO
  • HMO
  • POS
  • PPO
Blue Shield of California
  • HMO
  • INSURANCE PLAN
  • MANAGED MEDICAID PLAN
  • MEDICARE MAPD
  • MEDICARE PDP
  • MEDICARE-MEDICAID PLAN
  • OTHER COMMERCIAL
  • OTHER MEDICARE
  • OTHER MEDICARE PART D
  • PPO
Cigna
  • EPO
  • HMO
  • PPO
EmblemHealth
  • HMO
  • INSURANCE PLAN
  • MANAGED MEDICAID PLAN
  • MEDICARE MAPD
  • MEDICARE PDP
  • OTHER COMMERCIAL
  • OTHER MEDICARE PART D
Health First
  • HMO
  • POS
Health New England
  • HMO
  • MANAGED MEDICAID PLAN
  • MEDICARE MAPD
  • OTHER COMMERCIAL
Horizon Healthcare
  • EPO
  • POS
Humana
  • HMO
  • INDEMNITY
  • POS
  • PPO
Independent Health
  • EPO
  • POS
  • PPO
Managed Medicaid
  • OTHER MANAGED MEDICAID
Medicaid
  • OTHER MEDICAID
  • STATE MEDICAID
MetroPlus Health
  • INSURANCE PLAN
  • MANAGED MEDICAID PLAN
  • MEDICARE MAPD
  • MEDICARE-MEDICAID PLAN
Northwell Health
  • INSURANCE PLAN
UnitedHealthcare
  • EPO
  • HMO
  • POS
  • PPO
Wellcare
  • EPO
  • HMO
  • INSURANCE PLAN
  • MANAGED MEDICAID PLAN
  • MEDICARE MAPD
  • MEDICARE PDP
  • MEDICARE SNP
  • MEDICARE-MEDICAID PLAN
  • OTHER MEDICARE
  • OTHER MEDICARE PART D
View 12 Less Insurance Carriers -

Locations

The Ruttenberg Treatment Center
1470 Madison Ave Fl 3, New York, NY 10029

Clinical Research

Clinical research consists of overseeing clinical studies of patients undergoing new treatments and therapies, and publishing articles in peer reviewed medical journals. Providers who actively participate in clinical research are generally at the forefront of the fields and aware of the most up-to-date advances in treatments for their patients.

12 Clinical Trials

A Phase 3, Open-Label, Multicenter, Randomized, Active-controlled Study to Assess PK and Compare the Efficacy, Safety, and Tolerability of P1101 vs Anagrelide as 2nd Line Therapy for Essential Thrombocythemia (SURPASS ET): The Core Study and Its Extension Study.
A Phase 3, Open-Label, Multicenter, Randomized, Active-controlled Study to Assess PK and Compare the Efficacy, Safety, and Tolerability of P1101 vs Anagrelide as 2nd Line Therapy for Essential Thrombocythemia (SURPASS ET): The Core Study and Its Extension Study.
Enrollment Status: Active_not_recruiting
Publish Date: July 22, 2026
Intervention Type: Drug, Biological
Study Drug: PEG-IFN-Alpha-2b
Study Phase: Phase 3
Myeloproliferative Neoplasms (MPN) and COVID-19
Myeloproliferative Neoplasms (MPN) and COVID-19
Enrollment Status: Completed
Publish Date: September 15, 2025
A Phase 1, Multinational Study of MCLA-117 in Acute Myelogenous Leukemia
A Phase 1, Multinational Study of MCLA-117 in Acute Myelogenous Leukemia
Enrollment Status: Terminated
Publish Date: April 06, 2025
Intervention Type: Drug
Study Drug: MCLA-117
Study Phase: Phase 1
Panobinostat and Ruxolitinib In MyElofibrosis (PRIME STUDY) - Phase I/II Study of Combination Oral JAK2 Tyrosine Kinase Inhibitor (JAK2-TKI) and Histone Deacetylase Inhibitor (HDACI) Therapy in Patients With Myelofibrosis
Panobinostat and Ruxolitinib In MyElofibrosis (PRIME STUDY) - Phase I/II Study of Combination Oral JAK2 Tyrosine Kinase Inhibitor (JAK2-TKI) and Histone Deacetylase Inhibitor (HDACI) Therapy in Patients With Myelofibrosis
Enrollment Status: Completed
Publish Date: October 31, 2023
Intervention Type: Drug
Study Phase: Phase 1/Phase 2
Phase I Study of AVID200 in Patients With Myelofibrosis (Myeloproliferative Neoplasms Research Consortium [MPN-RC] 118)
Phase I Study of AVID200 in Patients With Myelofibrosis (Myeloproliferative Neoplasms Research Consortium [MPN-RC] 118)
Enrollment Status: Completed
Publish Date: February 10, 2023
Intervention Type: Drug
Study Drug: AVID200
Study Phase: Phase 1
PD-1 Inhibition in Advanced Myeloproliferative Neoplasms
PD-1 Inhibition in Advanced Myeloproliferative Neoplasms
Enrollment Status: Completed
Publish Date: June 21, 2021
Intervention Type: Drug
Study Phase: Phase 2
Use of Direct Oral Anticoagulants (DOACs) in Patients With Ph-negative Myeloproliferative Neoplasms
Use of Direct Oral Anticoagulants (DOACs) in Patients With Ph-negative Myeloproliferative Neoplasms
Enrollment Status: Completed
Publish Date: February 21, 2021
Intervention Type: Drug
Open Label Phase I Study of Single Agent Oral RG7388 in Patients With Polycythemia Vera and Essential Thrombocythemia (With Pilot Feasibility Study in Combination With Pegylated Interferon Alfa 2a for Patients Who do Not Respond to the Single Agent at Each Dose Level)
Open Label Phase I Study of Single Agent Oral RG7388 in Patients With Polycythemia Vera and Essential Thrombocythemia (With Pilot Feasibility Study in Combination With Pegylated Interferon Alfa 2a for Patients Who do Not Respond to the Single Agent at Each Dose Level)
Enrollment Status: Completed
Publish Date: September 12, 2019
Intervention Type: Drug
Study Phase: Phase 1
Randomized Trial of Pegylated Interferon Alfa-2a Versus Hydroxyurea Therapy in the Treatment of High Risk Polycythemia Vera (PV) and High Risk Essential Thrombocythemia (ET)
Randomized Trial of Pegylated Interferon Alfa-2a Versus Hydroxyurea Therapy in the Treatment of High Risk Polycythemia Vera (PV) and High Risk Essential Thrombocythemia (ET)
Enrollment Status: Completed
Publish Date: April 30, 2019
Intervention Type: Drug
Study Phase: Phase 3
Exploring the Potential of Dual Kinase JAK 1/2 Inhibitor Ruxolitinib (INC424) With Reduced Intensity Allogeneic Hematopoietic Cell Transplantation in Patients With Myelofibrosis
Exploring the Potential of Dual Kinase JAK 1/2 Inhibitor Ruxolitinib (INC424) With Reduced Intensity Allogeneic Hematopoietic Cell Transplantation in Patients With Myelofibrosis
Enrollment Status: Terminated
Publish Date: March 20, 2019
Intervention Type: Drug
Study Phase: Phase 2
View 9 Less Clinical Trials

299 Total Publications

Erratum: Selinexor Plus Ruxolitinib in Janus Kinase Inhibitor-Naïve Myelofibrosis: Phase III SENTRY Trial.
Erratum: Selinexor Plus Ruxolitinib in Janus Kinase Inhibitor-Naïve Myelofibrosis: Phase III SENTRY Trial.
Journal: Journal of clinical oncology : official journal of the American Society of Clinical Oncology
Published: July 30, 2026
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Frequently Asked Questions about Dr. John O. Mascarenhas

How do I make an appointment with Dr. John O. Mascarenhas?

You can book an appointment with Dr. John O. Mascarenhas by calling their office at 212-257-0031. MediFind provides direct contact information so you can schedule visits, second opinions, or consultations without navigating third-party calendars.

Is Dr. John O. Mascarenhas a top-rated expert for Myeloproliferative Neoplasms (MPN)?

MediFind is an objective health platform that identifies experts based on real-world data. Dr. John O. Mascarenhas is classified as an Elite expert for Myeloproliferative Neoplasms (MPN), meaning they are among the top experts in the country for this condition. This ranking is based on their volume of patients, published research, and peer connections.

What conditions does Dr. John O. Mascarenhas specialize in?

While Dr. John O. Mascarenhas is a Oncology, they have specific expertise in Myeloproliferative Neoplasms (MPN), Thrombocytopenia, and Acute Myeloid Leukemia (AML). MediFind analyzes a doctor's articles and referral patterns to identify their specific areas of focus within Oncology.

Does Dr. John O. Mascarenhas participate in research or clinical trials?

Yes. Dr. John O. Mascarenhas has published 299 articles and abstracts on conditions like Myeloproliferative Neoplasms (MPN). You can view a list of Dr. John O. Mascarenhas's latest peer-reviewed publications and clinical trial participation on their profile to see if they are active in new treatments.

Does Dr. John O. Mascarenhas accept my insurance?

Dr. John O. Mascarenhas accepts most major insurance plans, including Aetna and Anthem BCBS. We recommend calling the office directly at 212-257-0031 to verify that your specific plan is currently accepted before your visit.

Areas of Expertise

MediFind evaluates expertise by pulling from factors such as number of articles a doctor has published in medical journals, participation in clinical trials, speaking at industry conferences, prescribing and referral patterns, and strength of connections with other experts in their field.

Learn more about MediFind’s expert tiers

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