Pembrolizumab in the Treatment of Metastatic Gastric Cancer
Rakhimov R Radmir1*, AA Izmailov1, ON Lipatov1,2, AV Sultanbaev1, KV Menshikov1,2, AF Nasretdinov1 and VA Surovyatkin1
1State Autonomous Institution of Healthcare Republican Clinical Oncological Dispensary of the Ministry of Health of the Republic of Bashkortostan, Ufa, Russia
2Federal State Budgetary Educational Institution of Higher Education "Bashkir State Medical University" of the Ministry of Health of the Russian Federation, Russia
*Corresponding Author: Rakhimov R Radmir, State Autonomous Institution of Healthcare Republican Clinical Oncological Dispensary of the Ministry of Health of the Republic of Bashkortostan, Ufa, Russia.
Received: September 02, 2021; Published: September 20, 2021
The incidence of stomach cancer has been declining over the past decade, but unfortunately it is still the fifth most common disease with the third death rate among cancers. Diagnosis of stomach cancer usually occurs at the stage of neglect and incurability (stages III - IV), in the early stages (I - II stages) clear symptoms do not appear. 25% of patients have advanced gastric cancer, the other 25 - 50% progress to metastatic gastric cancer. The prognosis is especially poor for patients who have not responded to 1 line of chemotherapy. In the United States in 2012, 54.5% of patients received second and third lines. Five-year survival rate is 30% among all stages. In recent years, new drugs have emerged in the treatment of stomach cancer that needs to be studied. Pembrolizumab demonstrated efficacy in PD-L1-positive advanced gastric/gastroesophageal junction cancer in the first-, second-, and third-line setting in KEYNOTE-062, KEYNOTE-061, and KEYNOTE-059, respectively.
In KEYNOTE-062, median follow-up was 11 months, median OS (pembrolizumab vs. chemotherapy) was 17 months versus 11 months (HR, 0.69; 95% CI, 0.49-0.97), median PFS was 3 months versus 6 months (HR, 1.09, 95% CI; 0.79-1.49), ORR was 25% versus 38%, and median (range) DOR was 19 months (1+ to 34+) versus 7 months (2+ to 30+).
Keywords: Pembrolizumab; Gastric Cancer; Immune Therapy; Checkpoint Inhibitor; Systemic Therapy
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