Deciphering the Patterns of Dual Primary Cases Registered at the Hospital-Based Cancer Registry: First Experience...

Area of Science:

• Oncology
• Cancer Epidemiology
• Pathology

Background:

• Dual primary malignancies present unique diagnostic and treatment challenges.
• Understanding patterns of these cancers is crucial for improving patient outcomes.
• Hospital-based cancer registries (HBCR) provide valuable data for epidemiological studies.

Purpose of the Study:

• To delineate the epidemiological patterns of dual primary malignancies.
• To identify common primary and secondary cancer sites.
• To analyze the synchronous and metachronous nature of dual cancers.

Main Methods:

• Data sourced from the HBCR of Cancer Hospital, Sangrur, Punjab, India (2018-2019).
• Dual primary cancers coded using International Agency for Research on Cancer (IARC) rules.
• Statistical analysis included calculating time intervals between diagnoses.

Main Results:

• 45 dual primary cases identified out of 6,933 registered.
• 64.4% were synchronous, 35.6% metachronous.
• Most common primary sites: breast (33%), head and neck (22.2%), gynecological (11%).
• Most common secondary sites: gastrointestinal tract (31%), gynecological (18%), head and neck (16%).
• Breast cancer showed a higher incidence of second malignancy.

Conclusions:

• Breast, head and neck, gynecological, and prostate cancers are frequent initial primaries.
• Gastrointestinal tract, gynecological, and head and neck sites are common for secondary malignancies.
• Synchronous dual tumors constitute the majority, and regular follow-up is essential for survival assessment.