Mesothelioma Trial Will Include Drug Tested for COVID-19

OT-101 Has Been Tested in Cancers and COVID-19

Oncotelic Therapeutics, Inc. is developing OT-101 as a treatment for cancer and some viruses. OT-101 blocks production of a protein called transforming growth factor beta two (TGF-β2). TGF-β2 may help cancer cells and viruses evade the immune system. Blocking this protein may allow healthy immune cells to attack cancer cells.

According to company officials, OT-101 has achieved “good efficacy” in early clinical trials. These trials have investigated the drug in at least two types of patients:

1. Individuals diagnosed with COVID-19
2. Patients with solid tumors (similar to mesothelioma)

Trial Results: OT-101 for Glioblastoma

In one trial, researchers studied 0T-101 against glioblastoma, a challenging form of brain and spinal cancer. About 25% of patients receiving OT-101 experienced a response to treatment. This means their tumors decreased in size or disappeared. About 9% of patients also saw no signs of tumor growth or progression for six months or longer.

Some study patients also experienced prolonged survival. About 33% of OT-101-treated patients achieved a median survival of 3.5 years. This represents a 3-year improvement versus standard chemotherapy treatment.

Trial Results: OT-101 for COVID-19

OT-101 also performed well against COVID-19. Researchers treated all patients with standard treatment. Patients also received either OT-101 or a placebo. The OT-101 patients had a mortality rate about 75% lower than the placebo patients.

Dr. Vuong Trieu, CEO and Chairman of Oncotelic, called the results “gratifying.” Dr. Trieu also alluded to future development of OT-101 as a treatment for other respiratory illnesses, including the flu.

COVID-19 and Cancers Like Mesothelioma Exploit Similar Pathways

In these early clinical trials, OT-101 demonstrated efficacy against cancer and COVID-19. It is relatively uncommon for a drug to have such broad applications. However, OT-101 has a property that sets it apart from other drugs.

OT-101 blocks an important protein (TGF-β2) implicated in both conditions. Tumor cells and the COVID-19 virus use TGF-β2 to avoid the immune system. By blocking the protein, OT-101 allows the immune system to attack infected cells more effectively.

Blocking TGF-β2 may also allow immune cells to recognize and attack cancer cells. This might make existing cancer treatments, such as immunotherapy, more effective.

OT-101 / Keytruda® Combination Provides New Approach to Enhancing Immunotherapy

OT-101 has achieved promising early results in treating solid tumors. The newly announced trial plan will determine if these results apply to mesothelioma. It may be the first mesothelioma trial ever to investigate a ​​TGF-β2-blocking drug in combination with immunotherapy.

The immunotherapy component, pembrolizumab (Keytruda®), has already been tested in mesothelioma. As a single pleural mesothelioma treatment, Keytruda® did not extend survival versus chemotherapy.

However, Keytruda® has shown promise coupled with CAR T-cell therapy. Mesothelioma patients who received both treatments achieved a median survival of about two years. This approach extended survival by more than a year compared to earlier treatments.

It is too soon to tell whether OT-101 and Keytruda® will achieve similar or better efficacy compared to Keytruda® and CAR T cells. The proposed clinical trial will help researchers study this question.

The study proposal was submitted for approval in December 2021. At the time of publication, no clinical trial records indicating approval yet exist. The study plan and protocol may still be in development.

Clinical trials like this one provide expanded treatment options for many mesothelioma patients. Those interested in treatment with OT-101 and Keytruda® should discuss options with a mesothelioma doctor. The doctor can help determine the best treatment approach.