Stomach cancer

Stomach Cancer

Epidemiology:

In the United States, gastric cancer remains a significant health concern, with approximately 26,000 new cases diagnosed annually, despite a general decline in incidence over recent decades ^1,2. The occurrence of spontaneous remission (SR) in gastric cancer is extraordinarily rare, estimated to account for less than 0.5% of all reported malignancies, similar to findings in other cancer types ^3,4. Such remissions, often characterized by the complete or partial disappearance of tumors without therapeutic intervention, complicate the understanding of gastric cancer pathology and treatment ⁵.

Clinical Characteristics:

To date, there have been twenty-four reported cases of SR of either primary or metastatic gastric tumors. There are several clinical trends that may be observed among these cases. The patients’ age at the time of regression ranges from 6 to over 80 years. Females showed slightly higher rates of SR of gastric tumors. See table 1 below for further information.

Histological Characteristics:

Of the cases analyzed, the histology of the tumors was primarily reported as originating from the stomach, with most identified as gastric adenocarcinoma or related glandular lesions. Instances of non-gastric malignancies, such as lymphomas or other extragastric tumor types, were excluded from this data collection to maintain diagnostic consistency.

Proposed Contributing Mechanisms:

Among the reported cases, proposed mechanisms varied considerably. In several cases, tumor regression was associated with Helicobacter pylori eradication or postoperative infection, while others proposed mechanisms such as tumor necrosis, ischemic necrosis, or immune modulation as possible causes. A few reports also suggested roles for biopsy-induced regression and viral or cytokine-mediated immune responses. The remaining cases did not report any specific therapeutic or mechanistic associations. Collectively, these findings highlight that infection control, immune modulation, and tissue necrosis may play contributory roles in the spontaneous regression of gastric tumors.

Site and Extent of Remission:

Among the reported cases, the majority exhibited complete regression confined to the primary gastric lesion, whereas a smaller number demonstrated remission at metastatic sites such as the liver, spleen, duodenum, and peritoneum. One patient maintained remission for over ten years, indicating durable disease control. Although follow-up data are limited, these findings suggest that spontaneous regression in gastric tumors can occasionally result in sustained remission.

Table 1: Stomach Cancer SR Cases and Clinical Characteristics

References:

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