Mohamad-Ali Salloum is a Pharmacist and science writer. He loves simplifying science to the general public and healthcare students through words and illustrations. When he's not working, you can usually find him in the gym, reading a book, or learning a new skill.
Dostarlimab: The new magic anti-cancer treatment that cured 100% of the trial patients.
Mohamad Ali Salloum, PharmD • June 11, 2022
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12 patients took the treatment with Dostarlimab and their rectal cancer vanished. Just like that💫
The physicians did physical exams, digital rectal examinations, biopsies, PET scans, and MRIs and they found nothing!
Not to mention that no adverse events of grade 3 or higher have been reported!!
How was the idea of this study formulated?
Usually, oncologists will prescribe to patients with locally advanced rectal cancer neoadjuvant chemotherapy and radiation (neoadjuvant treatment is the kind of treatment given before doing the surgery to help shrink the tumor size and prevent its further spread).
For the patients suffering from metastatic rectal cancer due to a deficiency in mismatch repairing, positive results were observed when PD-1 blockers were used.
Researchers hypothesized that there will be better results when this type of medication is used when the rectal cancer is still local and did not metastasize.
What is the design of the study?
So, this Phase 2, prospective study was initiated, and the participants received a dose of Dostarlimab every three weeks for six months, and the plan was to undergo standard treatments of chemotherapy, radiation therapy, and then surgery following the treatment with Dostarlimab.
However, researchers found that in every case, the cancer was cleared through the experimental treatment alone.
This result is considered astonishing although it’s only in a small number of patients because it’s never happened in the history of cancer.
What is Dostarlimab-gxly?
Dostarlimab-gxly is a humanized monoclonal antibody that works as a PD-1 blocker, AKA checkpoint inhibitor. It binds to the PD-1 receptor and prevents its interaction with its ligands, PD-L1 and PD-L2.
Like Pembrolizumab, It releases the brakes on an immune cell, freeing it to recognize and attack cancer cells, according to MSK.
Its side effects include (but not limited to):
- Fatigue/asthenia,
- Nausea,
- Diarrhea,
- Anemia,
- Constipation.
For this medication to prove itself, a longer follow-up is needed to assess the duration of response (DoR).
Also, more studies should be done on a larger sample because 12 patients showing that the tumor vanished is not enough to prove that a molecule or a drug is effective 100%.
Note that this drug is being also investigated if it can beat other cancers like gastric, prostate, and pancreatic cancers.
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Mohamad-Ali Salloum, PharmD
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References: Qiang S, Wu J, Zheng D, et al. The effect of stress mindset on psychological pain: the chain mediating roles of cognitive reappraisal and self-identity. Front Psychol. 2025;16. 1 Bosshard M, Gomez P. Effectiveness of stress arousal reappraisal and stressisenhancing mindset interventions on task performance outcomes: a meta-analysis. Sci Rep. 2024. 2 Zhao S, Chen P, Jin L, et al. Unlocking Emotional Well-Being: Evaluation of a Stress Mindset Intervention With a Metacognitive Approach. Emotion. 2025;25(5):1169–1184. 4 Meyer HH, Stutts LA. The Effect of Mindset Interventions on Stress and Academic Motivation in College Students. Innov High Educ. 2024;49:783–798. 7 Crum AJ, Santoro E, Handley-Miner I, et al. Evaluation of the “Rethink Stress” Mindset Intervention: A Metacognitive Approach to Changing Mindsets. J Exp Psychol Gen. 2023. 3 Laferton JAC, Fischer S, Ebert DD, et al. The Effects of Stress Beliefs on Daily Affective Stress Responses. Ann Behav Med. 2020;54(4):258–267. 5 UCSF Stress Measurement Network. Beliefs about Stress . 2026. 6
References: Qiang S, Wu J, Zheng D, et al. The effect of stress mindset on psychological pain: the chain mediating roles of cognitive reappraisal and self-identity. Front Psychol. 2025;16. 1 Bosshard M, Gomez P. Effectiveness of stress arousal reappraisal and stressisenhancing mindset interventions on task performance outcomes: a meta-analysis. Sci Rep. 2024. 2 Zhao S, Chen P, Jin L, et al. Unlocking Emotional Well-Being: Evaluation of a Stress Mindset Intervention With a Metacognitive Approach. Emotion. 2025;25(5):1169–1184. 4 Meyer HH, Stutts LA. The Effect of Mindset Interventions on Stress and Academic Motivation in College Students. Innov High Educ. 2024;49:783–798. 7 Crum AJ, Santoro E, Handley-Miner I, et al. Evaluation of the “Rethink Stress” Mindset Intervention: A Metacognitive Approach to Changing Mindsets. J Exp Psychol Gen. 2023. 3 Laferton JAC, Fischer S, Ebert DD, et al. The Effects of Stress Beliefs on Daily Affective Stress Responses. Ann Behav Med. 2020;54(4):258–267. 5 UCSF Stress Measurement Network. Beliefs about Stress . 2026. 6
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