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UPDATE: Mark Thomas Seidl, 56, of Shirley passed away peacefully on Friday morning, December 29, 2023 in his home surrounded by the love of his family and his faithful dog, Jill. Mark T. Seidl Obituary – Visitation & Funeral Information (andersonfuneral.com)

Service will be held at the First Parish Church of Groton, 1 Powderhouse Road, Groton, MA 01450. Saturday, February 24, 2024. Time: 2 pm followed by a reception with light refreshments in the downstairs Vestry.

Mark Seidl is only 56 years old, and he is battling Stage 4 Acral Lentiginous Melanoma which is a rare type of skin cancer. It begins when the melanocytes in the skin grow out of control and form tumors. This is Mark’s third battle fighting this rare cancer. First battle was in 2016 and surgery was successful and clear for four years. ALM reared its ugly head again in 2020 and had migrated to his lymphatic system. Once again surgery was successful and clear of cancer until now.

This September we found out that it has metastasized throughout his body, and he is currently undergoing Immunotherapy at Massachusetts General Hospital in Boston. Immunotherapy will give him a 50/50 chance of curing this nasty mutation. He has an amazing team of doctors and feeling hopeful.

We lost all of our savings and 401K during the first two battles with ALM and will be needing help to get through this last hope of recovery.  Sadly, ALM hit fast and furious this time. Given his six-month scans have been clear of cancer the past few years, this was shocking news. There was no time to prepare for this and he had to stop working the day he was diagnosed.  

Sadly, immunotherapy and other attempts to fight his ALM have caused major side effects, and we are facing the reality of hospice care. Donations will be going to medical and insurance costs, rent so that we can remain comfortably in our home and end of life expenses. Any donation small or large would be deeply appreciated. 

Mark is a devoted and loving husband, son, son-in-law, father, stepfather and grandfather, brother, brother in-law and uncle. He has a heart of gold and has always been there for others in times of need. I can’t think of anyone that knows him that does not love him.

Love, Blessings and Gratitude,
Mark and Audrey Seidl



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